path: root/deheader

#!/usr/bin/env python
"""\
deheader -- find (optionally remove) unneeded includes in C or C++ sourcefiles.

Usage: deheader [-h] [-i pattern] [-m cmd] [-q] [-r] [-x pattern] [-v] [file...]
    -h, --help     Emit this help message and quit.
    -m, --maker    Set the build command (by default 'make')
    -i, --ignore   Ignore (don't remove) headers matching the argument regexp
    -q, --quiet    Suppress statistical summary
    -r, --remove   Remove the final set of unneeded headers
    -v, --verbose  Be chatty about what you're doing.
    -x, --exclude  Exclude files matching regexp
    -V, --version  Emit version and exit.

This tool takes a list of C or C++ sourcefiles and generates a report
on which #includes can be omitted from them -- the test, for each foo.c
or foo.cc or foo.cpp, is simply whether 'rm foo.o; make foo.o' returns a
zero status. Optionally, with the -r option, the unneeded headers are removed.
The tool also reports on headers required for strict portability.

If a sourcefile argument is a directory, the report is generated on all source
files beneath it.  Subdirectories beginning with a dot are ignored.  If no
arguments are given, the program runs as if the name of the current directory
had been passed to it.

The original sourcefile is moved to a name with an .orig suffix and restored
on interrupt or after processing with its original timestamp, unless the
-r option was given and headers removed.

The last line of the output is a statistical summary of operations.
"""
# SPDX-License-Identifier: BSD-2-Clause

from __future__ import print_function

import sys, os, getopt, time, re, operator, subprocess

version = "1.3"

try:
    from subprocess import getstatusoutput
except ImportError:
    from commands import getstatusoutput

BATON_DEBUG    = 1
PROGRESS_DEBUG = 2
COMMAND_DEBUG  = 3

# Difference in various compiler implementations and OSes mean that for cross-
# platform compatibility you sometimes want to leave "unneeded" headers alone
# because they're required in order to satify dependencies on other platforms.
requirements = (
    # Headers mandated by SuS Version 2 System Interfaces.
    # a64l, l64a - convert between a 32-bit integer and a radix-64 ASCII string
    (r"a64l()",          ["<stdlib.h>"]),
    (r"l64a()",          ["<stdlib.h>"]),
    # abort - generate an abnormal process abort
    (r"abort()",         ["<stdlib.h>"]),
    # abs - return an integer absolute value
    (r"abs()",           ["<stdlib.h>"]),
    # access - determine accessibility of a file
    (r"access()",        ["<unistd.h>"]),
    # acos - arc cosine function
    (r"acos()",          ["<math.h>"]),
    # acosh, asinh, atanh - inverse hyperbolic functions
    (r"acosh()",         ["<math.h>"]),
    (r"asinh()",         ["<math.h>"]),
    (r"atanh()",         ["<math.h>"]),
    # advance - pattern match given a compiled regular expression
    (r"advance()",       ["<regexp.h>"]),
    # aio.h - asynchronous input and output
    (r"aio_cancel()",    ["<aio.h>"]),
    (r"aio_error()",     ["<aio.h>"]),
    (r"aio_fsync()",     ["<aio.h>"]),
    (r"aio_read()",      ["<aio.h>"]),
    (r"aio_return()",    ["<aio.h>"]),
    (r"aio_suspend()",   ["<aio.h>"]),
    (r"aio_write()",     ["<aio.h>"]),
    (r"lio_listio()",    ["<aio.h>"]),
    # alarm - schedule an alarm signal
    (r"alarm()",         ["<unistd.h>"]),
    # asctime, asctime_r - convert date and time to a string
    (r"asctime()",       ["<time.h>"]),
    (r"asctime_r()",     ["<time.h>"]),
    # asin - arc sine function
    (r"asin()",          ["<math.h>"]),
    # atan - arc tangent function
    (r"atan()",          ["<math.h>"]),
    # atan2 - arc tangent function
    (r"atanh()",         ["<math.h>"]),
    # atanh - hyperbolic arc tangent
    (r"atan2()",         ["<math.h>"]),
    # atexit - register a function to run at process termination
    (r"atexit()",        ["<stdlib.h>"]),
    # atof - convert a string to double-precision number
    (r"atof()",          ["<stdlib.h>"]),
    # atoi - convert a string to integer
    (r"atol()",          ["<stdlib.h>"]),
    # atol - convert a string to long integer
    (r"atol()",          ["<stdlib.h>"]),
    # basename - return the last component of a pathname
    (r"basename()",      ["<libgen.h>"]),
    # bcmp - memory operations
    (r"bcmp()",          ["<strings.h>"]),
    # bcopy - memory operations
    (r"bcopy()",         ["<strings.h>"]),
    # brk, sbrk - change space allocation (LEGACY)
    (r"brk()",           ["<unistd.h>"]),
    (r"sbrk()",          ["<unistd.h>"]),
    # bsearch - binary search a sorted table
    (r"bsort()",         ["<stdlib.h>"]),
    # btowc - single-byte to wide-character conversion
    (r"btowc()",         ["<stdio.h>", "<wchar.h>"]),
    # bzero - memory operations
    (r"bzero()",         ["<strings.h>"]),
    # calloc - a memory allocator
    (r"calloc()",        ["<stdlib.h>"]),
    # catclose - close a message catalogue descriptor
    (r"catclose()",      ["<nl_types.h>"]),
    # catgets - read a program message
    (r"catgets()",       ["<nl_types.h>"]),
    # catopen - open a message catalogue
    (r"catopen()",       ["<nl_types.h>"]),
    # cbrt - cube root function
    (r"cbrt()",          ["<math.h>"]),
    # ceil - ceiling value function
    (r"ceil()",          ["<math.h>"]),
    # chdir - change working directory
    (r"chdir()",         ["<unistd.h>"]),
    # chmod - change mode of a file
    (r"chmod()",         ["<sys/stat.h>", "<sys/types.h>"]),
    # chown - change owner and group of a file
    (r"chown()",         ["<sys/types.h>", "<unistd.h>"]),
    # chroot - change root directory (LEGACY)
    (r"chroot()",        ["<unistd.h>"]),
    # clearerr - clear indicators on a stream
    (r"clearerr()",      ["<stdio.h>"]),
    # clock - report CPU time used
    (r"clock()",         ["<time.h>"]),
    # clock_settime, clock_gettime, clock_getres - clock and timer functions
    (r"clock_settime()", ["<time.h>"]),
    (r"clock_gettime()", ["<time.h>"]),
    (r"clock_getres()",  ["<time.h>"]),
    # close - close a file descriptor
    (r"close()",         ["<unistd.h>"]),
    # closedir - close a directory stream
    (r"closedir()",      ["<sys/types.h>", "<dirent.h>"]),
    # closelog, openlog, setlogmask, syslog - control system log
    (r"closelog()",      ["<syslog.h>"]),
    (r"openlog()",       ["<syslog.h>"]),
    (r"setlogmask()",    ["<syslog.h>"]),
    (r"syslog()",        ["<syslog.h>"]),
    # compile - produce a compiled regular expression
    (r"compile()",       ["<regexp.h>"]),
    # confstr - get configurable variables
    (r"confstr()",       ["<unistd.h>"]),
    # cos - cosine function
    (r"cos()",           ["<math.h>"]),
    # cosh - hyperbolic cosine function
    (r"cosh()",          ["<math.h>"]),
    # creat - create a new file or rewrite an existing one
    (r"creat()",         ["<sys/types.h>", "<sys/stat.h>", "<fcntl.h>"]),
    # crypt - string encoding function
    (r"crypt()",         ["<unistd.h>"]),
    # ctermid - generate a pathname for controlling terminal
    (r"ctermid()",       ["<stdio.h>"]),
    # ctime, ctime_r - convert a time value to date and time string
    (r"ctime()",         ["<time.h>"]),
    (r"ctime_r()",       ["<time.h>"]),
    # ctype.h - character types
    (r"isalnum()",       ["<ctype.h>"]),
    (r"isalpha()",       ["<ctype.h>"]),
    (r"isascii()",       ["<ctype.h>"]),
    (r"iscntrl()",       ["<ctype.h>"]),
    (r"isdigit()",       ["<ctype.h>"]),
    (r"isgraph()",       ["<ctype.h>"]),
    (r"islower()",       ["<ctype.h>"]),
    (r"isprint()",       ["<ctype.h>"]),
    (r"ispunct()",       ["<ctype.h>"]),
    (r"isspace()",       ["<ctype.h>"]),
    (r"isupper()",       ["<ctype.h>"]),
    (r"isxdigit()",      ["<ctype.h>"]),
    (r"toascii()",       ["<ctype.h>"]),
    (r"tolower()",       ["<ctype.h>"]),
    (r"toupper()",       ["<ctype.h>"]),
    (r"_tolower()",      ["<ctype.h>"]),
    (r"_toupper()",      ["<ctype.h>"]),
    # cuserid - character login name of the user
    (r"cuserid()",       ["<stdio.h>"]),
    # daylight - daylight savings time flag
    (r"extern\s+int\s+daylight;", ["<time.h>"]),
    # dbm_clearerr, dbm_close, dbm_delete, dbm_error, dbm_fetch, dbm_firstkey, dbm_nextkey, dbm_open, dbm_store - database functions
    (r"dbm_clearerr()",  ["<ndbm.h>"]),
    (r"dbm_close()",     ["<ndbm.h>"]),
    (r"dbm_delete()",    ["<ndbm.h>"]),
    (r"dbm_error()",     ["<ndbm.h>"]),
    (r"dbm_fetch()",     ["<ndbm.h>"]),
    (r"dbm_firstkey()",  ["<ndbm.h>"]),
    (r"dbm_nextkey()",   ["<ndbm.h>"]),
    (r"dbm_open()",      ["<ndbm.h>"]),
    (r"dbm_store()",     ["<ndbm.h>"]),
    # difftime - compute the difference between two calendar time values
    (r"difftime()",      ["<time.h>"]),
    # dirname - report the parent directory name of a file pathname
    (r"dirname()",       ["<libgen.h>"]),
    # div - compute the quotient and remainder of an integer division
    (r"div()",           ["<stdio.h>"]),
    # dlclose - close a dlopen() object
    (r"dlclose()",       ["<dlfcn.h>"]),
    # dlerror - get diagnostic information
    (r"dlerror()",       ["<dlfcn.h>"]),
    # dlsym - obtain the address of a symbol from a dlopen() object
    (r"dlsym()",         ["<dlfcn.h>"]),
    # drand48, erand48, jrand48, lcong48, lrand48, mrand48, nrand48, seed48, srand48 - generate uniformly distributed pseudo-random numbers
    (r"drand48()",       ["<stdlib.h>"]),
    (r"erand48()",       ["<stdlib.h>"]),
    (r"jrand48()",       ["<stdlib.h>"]),
    (r"lcong48()",       ["<stdlib.h>"]),
    (r"lrand48()",       ["<stdlib.h>"]),
    (r"mrand48()",       ["<stdlib.h>"]),
    (r"nrand48()",       ["<stdlib.h>"]),
    (r"seed48()",        ["<stdlib.h>"]),
    (r"srand48()",       ["<stdlib.h>"]),
    # dup, dup2 - duplicate an open file descriptor
    (r"dup()",           ["<unistd.h>"]),
    (r"dup2()",          ["<unistd.h>"]),
    # exit, _exit - terminate a process
    (r"exit()",          ["<stdlib.h>"]),
    (r"_exit()",         ["<unistd.h>"]),
    # ecvt, fcvt, gcvt - convert a floating-point number to a string
    (r"ecvt()",          ["<stdlib.h>"]),
    (r"fcvt()",          ["<stdlib.h>"]),
    (r"gcvt()",          ["<stdlib.h>"]),
    # encrypt - encoding function
    (r"encrypt()",       ["<unistd.h>"]),
    # endgrent, getgrent, setgrent - group database entry functions
    (r"endgrent()",      ["<grp.h>"]),
    (r"getgrent()",      ["<grp.h>"]),
    (r"setgrent()",      ["<grp.h>"]),
    (r"getgrnam()",      ["<grp.h>"]),
    (r"getgrgid()",      ["<grp.h>"]),
    (r"getgrnam_r()",    ["<grp.h>"]),
    (r"getgrgid_r()",    ["<grp.h>"]),
    # endpwent, getpwent, setpwent - user database functions
    (r"endpwent()",      ["<pwd.h>"]),
    (r"getpwent()",      ["<pwd.h>"]),
    (r"setpwent()",      ["<pwd.h>"]),
    (r"getpwnam()",      ["<pwd.h>"]),
    (r"getpwuid()",      ["<pwd.h>"]),
    (r"getpwnam_r()",    ["<pwd.h>"]),
    (r"getpwuid_r()",    ["<pwd.h>"]),
    # endutxent, getutxent, getutxid, getutxline, pututxline, setutxent - user accounting database functions
    (r"endutxent()",     ["<utmpx.h>"]),
    (r"getutxent()",     ["<utmpx.h>"]),
    (r"getutxid()",      ["<utmpx.h>"]),
    (r"getutxline()",    ["<utmpx.h>"]),
    (r"pututxline()",    ["<utmpx.h>"]),
    (r"setutxent()",     ["<utmpx.h>"]),
    # erf, erfc - error and complementary error functions
    (r"erf()",           ["<math.h>"]),
    (r"erfc()",          ["<math.h>"]),
    # environ, execl, execv, execle, execve, execlp, execvp - execute a file
    (r"extern\s+char\s+\*\*environ;",         ["<unistd.h>"]),
    (r"execl()",         ["<unistd.h>"]),
    (r"execv()",         ["<unistd.h>"]),
    (r"execle()",        ["<unistd.h>"]),
    (r"execve()",        ["<unistd.h>"]),
    (r"execlp()",        ["<unistd.h>"]),
    (r"execvp()",        ["<unistd.h>"]),
    # exp - exponential function
    (r"exp()",           ["<math.h>"]),
    #     expm1 - compute exponential functions
    (r"expm1()",         ["<math.h>"]),
    # FD_CLR - macros for synchronous I/O multiplexing
    (r"FD_CLR()",        ["<sys/time.h>"]),
    (r"FD_ISSET()",      ["<sys/time.h>"]),
    (r"FD_SET()",        ["<sys/time.h>"]),
    (r"FD_ZERO()",       ["<sys/time.h>"]),
    # fabs - absolute value function
    (r"fabs()",          ["<math.h>"]),
    # fattach - attach a STREAMS-based file descriptor to a file in the file system name space
    (r"fattach()",       ["<stropts.h>"]),
    # fchdir - change working directory
    (r"fchdir()",        ["<unistd.h>"]),
    # fchmod - change mode of a file
    (r"fchmod()",        ["<sys/stat.h>"]),
    # fchown - change owner and group of a file
    (r"fchown()",        ["<unistd.h>"]),
    # fdopen - associate a stream with a file descriptor
    (r"fdopen()",        ["<stdio.h>"]),
    # fclose - close a stream
    (r"fclose()",        ["<stdio.h>"]),
    # fdatasync - synchronise the data of a file
    (r"fdatasync()",     ["<unistd.h>"]),
    # fdetach - detach a name from a STREAMS-based file descriptor
    (r"fdetach()",       ["<stropts.h>"]),
    # fdopen - associate a stream with a file descriptor
    (r"fdopen()",        ["<stdio.h>"]),
    # ferror - test error indicator on a stream
    (r"ferror()",        ["<stdio.h>"]),
    # feof - test end-of-file indicator on a stream
    (r"feof()",          ["<stdio.h>"]),
    # fflush - flush a stream
    (r"fflush()",        ["<stdio.h>"]),
    # ffs - find first set bit
    (r"ffs()",           ["<strings.h>"]),
    # fgetc - get a byte from a stream
    (r"fgetc()",         ["<stdio.h>"]),
    # fgetpos - get current file position information
    (r"fgetpos()",       ["<stdio.h>"]),
    # fgets - get a string from a stream
    (r"fgets()",         ["<stdio.h>"]),
    # fgetwc - get a wide-character code from a stream
    (r"fgetwc()",        ["<stdio.h>", "<wchar.h>"]),
    # fgetws - get a wide-character string from a stream
    (r"fgetws()",        ["<stdio.h>", "<wchar.h>"]),
    # fileno - map a stream pointer to a file descriptor
    (r"fileno()",        ["<stdio.h>"]),
    # flockfile, ftrylockfile, funlockfile - stdio locking functions
    (r"flockfile()",     ["<stdio.h>"]),
    (r"ftrylockfile()",  ["<stdio.h>"]),
    (r"funlockfile()",   ["<stdio.h>"]),
    # fmod - floating-point remainder value function
    (r"fmod()",          ["<math.h>"]),
    # fmtmsg.h - message display structures
    (r"fmtmsg()",        ["<fmtmsg.h>"]),
    # fnmatch.h - filename-matching types
    (r"fnmatch()",       ["<fnmatch.h>"]),
    # fopen - open a stream
    (r"fopen()",         ["<stdio.h>"]),
    # fork - create a new process
    (r"fork()",          ["<sys/types.h>", "<unistd.h>"]),
    # fpathconf, pathconf - get configurable pathname variables
    (r"fpathconf()",     ["<unistd.h>"]),
    (r"pathconf()",      ["<unistd.h>"]),
    # fputc - put a byte on a stream
    (r"fputc()",         ["<stdio.h>"]),
    # fputs - put a string on a stream
    (r"fputs()",         ["<stdio.h>"]),
    # fputwc - put a wide-character code on a stream
    (r"fputwc()",        ["<stdio.h>"]),
    # fputws - put a wide-character string on a stream
    (r"fputws()",        ["<stdio.h>"]),
    # fread - binary input
    (r"fread()",         ["<stdio.h>"]),
    # free - free allocated memory
    (r"free()",          ["<stdlib.h>"]),
    # freopen - open a stream
    (r"freopen()",       ["<stdio.h>"]),
    # frexp - extract mantissa and exponent from a double precision number
    (r"frexp()",         ["<math.h>"]),
    # fscanf, scanf, sscanf - convert formatted input
    (r"fscanf()",        ["<stdio.h>"]),
    (r"scanf()",         ["<stdio.h>"]),
    (r"sscanf()",        ["<stdio.h>"]),
    # fseek, fseeko - reposition a file-position indicator in a stream
    (r"fseek()",         ["<stdio.h>"]),
    (r"fseeko()",        ["<stdio.h>"]),
    # fsetpos - set current file position
    (r"fsetpos()",       ["<stdio.h>"]),
    # fstat - get file status
    (r"fstat()",         ["<sys/types.h>", "<sys/stat.h>"]),
    # fstatvfs, statvfs - get file system information
    (r"fstatvfs()",      ["<sys/fstatvfs.h>"]),
    (r"statvfs()",       ["<sys/fstatvfs.h>"]),
    # fsync - synchronise changes to a file
    (r"fsync()",         ["<unistd.h>"]),
    # ftell, ftello - return a file offset in a stream
    (r"ftell()",         ["<stdio.h>"]),
    (r"ftello()",        ["<stdio.h>"]),
    # ftime - get date and time
    (r"ftime()",         ["<sys/timeb.h>"]),
    # ftok - generate an IPC key
    (r"ftok()",          ["<sys/ipc.h>"]),
    # ftruncate, truncate - truncate a file to a specified length
    (r"truncate()",      ["<unistd.h>"]),
    (r"ftruncate()",     ["<unistd.h>"]),
    # ftw - traverse (walk) a file tree
    (r"ftw()",           ["<ftw.h>"]),
    (r"nftw()",          ["<ftw.h>"]),
    # fwide - set stream orientation
    (r"fwide()",         ["<stdio.h>", "<wchar.h>"]),
    # fwprintf, wprintf, swprintf - print formatted wide-character output
    (r"fwprintf()",      ["<stdio.h>", "<wchar.h>"]),
    (r"wprintf()",       ["<stdio.h>", "<wchar.h>"]),
    (r"swprintf()",      ["<stdio.h>", "<wchar.h>"]),
    # fwrite - binary output
    (r"fwrite()",        ["<stdio.h>"]),
    # fwscanf, wscanf, swscanf - convert formatted wide-character input
    (r"fwscanf()",       ["<stdio.h>", "<wchar.h>"]),
    (r"wscanf()",        ["<stdio.h>", "<wchar.h>"]),
    (r"swscanf()",       ["<stdio.h>", "<wchar.h>"]),
    # gamma, signgam - log gamma function
    (r"gamma()",         ["<math.h>"]),
    # getc - get a byte from a stream
    (r"getc()",          ["<stdio.h>"]),
    # getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked - stdio with explicit client locking
    (r"getc_unlocked()", ["<stdio.h>"]),
    (r"getchar_unlocked()", ["<stdio.h>"]),
    (r"putc_unlocked()",    ["<stdio.h>"]),
    (r"putchar_unlocked()", ["<stdio.h>"]),
    # getchar - get a byte from a stdin stream
    (r"getchar()",          ["<stdio.h>"]),
    # getcontext, setcontext - get and set current user context
    (r"getcontext()",       ["<ucontext.h>"]),
    (r"setcontext()",       ["<ucontext.h>"]),
    # getcwd - get the pathname of the current working directory
    (r"getcwd()",        ["<unistd.h>"]),
    # getdate - convert user format date and time
    (r"getdate()",       ["<time.h>"]),
    # getdtablesize - get the file descriptor table size
    (r"getdtablesize()", ["<unistd.h>"]),
    # getegid - get the effective group ID
    (r"getegid()",       ["<unistd.h>", "<sys/types.h>"]),
    # getenv - get value of an environment variable
    (r"getenv()",        ["<stdlib.h>"]),
    # geteuid - get the effective user ID
    (r"geteuid()",       ["<unistd.h>", "<sys/types.h>"]),
    # getgid - get the real group ID
    (r"getgid()",        ["<unistd.h>", "<sys/types.h>"]),
    # getgrgid, getgrgid_r - get group database entry for a group ID
    (r"getgrgid()",      ["<sys/types.h>", "<grp.h>"]),
    (r"getgrgid_r()",    ["<sys/types.h>", "<grp.h>"]),
    # getgrnam, getgrnam_r - search group database for a name
    (r"getgrnam()",      ["<sys/types.h>", "<pwd.h>"]),
    (r"getgrnam_r()",    ["<sys/types.h>", "<pwd.h>"]),
    # getgroups - get supplementary group IDs
    (r"getgroups()",     ["<unistd.h>", "<sys/types.h>"]),
    # gethostid - get an identifier for the current host
    (r"gethostid()",     ["<unistd.h>"]),
    # getitimer, setitimer - get or set value of interval timer
    (r"getitimer()",     ["<sys/time.h>"]),
    (r"setitimer()",     ["<sys/time.h>"]),
    # getlogin, getlogin_r - get login name
    (r"getlogin()",      ["<unistd.h>"]),
    (r"getlogin_r()",    ["<unistd.h>"]),
    # getmsg, getpmsg - receive next message from a STREAMS file
    (r"getmsg()",        ["<stropts.h>"]),
    (r"getpmsg()",       ["<stropts.h>"]),
    # getopt, optarg, optind, opterr, optopt - command option parsing
    (r"getopt()",        ["<unistd.h>"]),
    (r"extern\s+char\s+\*\*optarg;",  ["<unistd.h>"]),
    # getpagesize - get the current page size
    (r"getpagesize()",   ["<unistd.h>"]),
    # getpass - read a string of characters without echo
    (r"getpass()",       ["<unistd.h>"]),
    # getpgid - get the process group ID for a process
    (r"getpgid()",       ["<unistd.h>"]),
    # getpgrp - get the process group ID of the calling process
    (r"getpgrp()",       ["<sys/types.h>", "<unistd.h>"]),
    # getpid - get the process ID
    (r"getpid()",        ["<sys/types.h>", "<unistd.h>"]),
    # getppid - get the parent process ID
    (r"getppid()",       ["<sys/types.h>", "<unistd.h>"]),
    # getpriority, setpriority - get or set the nice value
    (r"getpriority()",   ["<sys/resource.h>"]),
    (r"setpriority()",   ["<sys/resource.h>"]),
    # getpwnam, getpwnam_r - search user database for a name
    (r"getpwnam()",      ["<sys/types.h>", "<pwd.h>"]),
    (r"getpwnam_r()",    ["<sys/types.h>", "<pwd.h>"]),
    # getpwuid, getpwuid_r - search user database for a user ID
    (r"getpwuid()",      ["<sys/types.h>", "<pwd.h>"]),
    (r"getpwuid_r()",    ["<sys/types.h>", "<pwd.h>"]),
    # getrlimit, setrlimit - control maximum resource consumption
    (r"getrlimit()",     ["<sys/resource.h>"]),
    (r"setrlimit()",     ["<sys/resource.h>"]),
    # getrusage - get information about resource utilisation
    (r"getrusage()",     ["<sys/resource.h>"]),
    # gets - get a string from a stdin stream
    (r"gets()",          ["<stdio.h>"]),
    # getsid - get the process group ID of session leader
    (r"getsid()",        ["<unistd.h>"]),
    # getsubopt - parse suboption arguments from a string
    (r"getsubopt()",     ["<stdlib.h>"]),
    # gettimeofday - get the date and time
    (r"gettimeofday()",  ["<sys/time.h>"]),
    # getuid - get a real user ID
    (r"getuid()",        ["<sys/types.h>", "<unistd.h>"]),
    # getw - get a word from a stream
    (r"getw()",          ["<stdio.h>"]),
    # getwc - get a wide-character code from a stream
    (r"getwc()",         ["<stdio.h>", "<wchar.h>"]),
    # getws - get a wide-character string from a stream
    (r"getws()",         ["<stdio.h>", "<wchar.h>"]),
    # getwchar - get a wide character from a stdin stream
    (r"getwchar()",      ["<wchar.h>"]),
    # getwd - get the current working directory pathname
    (r"getwd()",         ["<unistd.h>"]),
    # glob.h - pathname pattern-matching types
    (r"glob()",          ["<glob.h>"]),
    (r"globfree()",      ["<glob.h>"]),
    # gmtime, gmtime_r - convert a time value to a broken-down UTC time
    (r"gmtime()",        ["<time.h>"]),
    (r"gmtime_r()",      ["<time.h>"]),
    # grantpt - grant access to the slave pseudo-terminal device
    (r"grantpt()",       ["<stdlib.h>"]),
    # hcreate, hdestroy, hsearch - manage hash search table
    (r"hcreate()",       ["<search.h>"]),
    (r"hdestroy()",      ["<search.h>"]),
    (r"hsearch ()",      ["<search.h>"]),
    # hypot - Euclidean distance function
    (r"hypot()",         ["<math.h>"]),
    # iconv.h - codeset conversion facility
    (r"iconv_open()",    ["<iconv.h>"]),
    (r"iconv()",         ["<iconv.h>"]),
    (r"iconv_close()",   ["<iconv.h>"]),
    # ilogb - return an unbiased exponent
    (r"ilogb()",         ["<math.h>"]),
    # index - character string operations
    (r"index()",         ["<strings.h>"]),
    # initstate, random, setstate, srandom - pseudorandom number functions
    (r"initstate()",     ["<stdlib.h>"]),
    (r"random()",        ["<stdlib.h>"]),
    (r"setstate()",      ["<stdlib.h>"]),
    (r"srandom()",       ["<stdlib.h>"]),
    # insque, remque - insert or remove an element in a queue
    (r"insque()",        ["<search.h>"]),
    (r"remque()",        ["<search.h>"]),
    # SuS ioctl specifies <stropts.h>, but that's just wrong
    # isastream - test a file descriptor
    (r"isastream()",     ["<stropts.h>"]),
    # isnan - test for a NaN
    (r"isnan()",         ["<math.h>"]),
    # j0, j1, jn - Bessel functions of the first kind
    (r"j0()",            ["<math.h>"]),
    (r"j1()",            ["<math.h>"]),
    (r"jn()",            ["<math.h>"]),
    # labs - return a long integer absolute value
    (r"labs()",          ["<stdlib.h>"]),
    # lchown - change the owner and group of a symbolic link
    (r"lchown()",        ["<unistd.h>"]),
    # ldexp - load exponent of a floating point number
    (r"ldexp()",         ["<math.h>"]),
    # ldiv - compute quotient and remainder of a long division
    (r"ldiv()",          ["<stdlib.h>"]),
    # lgamma - log gamma function
    (r"lgamma()",        ["<math.h>"]),
    # libgen.h - definitions for pattern matching functions
    (r"regcmp()",        ["<libgen.h>"]),
    (r"regex()",         ["<libgen.h>"]),
    # link - link to a file
    (r"link()",          ["<unistd.h>"]),
    # localeconv - determine the program locale
    (r"localeconv()",    ["<locale.h>"]),
    # localtime, localtime_r - convert a time value to a broken-down local time
    (r"localtime()",     ["<time.h>"]),
    (r"localtime_r()",   ["<time.h>"]),
    # lockf - record locking on files
    (r"lockf()",         ["<unistd.h>"]),
    # log - natural logarithm function
    (r"log()",           ["<math.h>"]),
    # log10 - base 10 logarithm function
    (r"log10()",         ["<math.h>"]),
    # log1p - compute a natural logarithm
    (r"log1p()",         ["<math.h>"]),
    # logb - radix-independent exponent
    (r"logb()",          ["<math.h>"]),
    # lsearch, lfind - linear search and update
    (r"lfind()",         ["<search.h>"]),
    (r"lsearch()",       ["<search.h>"]),
    # lseek - move the read/write file offset
    (r"lseek()",         ["<sys/types.h>", "<unistd.h>"]),
    # lstat - get symbolic link status
    (r"lstat()",         ["<sys/stat.h>"]),
    # makecontext, swapcontext - manipulate user contexts
    (r"makecontext()",   ["<ucontext.h>"]),
    (r"swapcontext()",   ["<ucontext.h>"]),
    # malloc - a memory allocator
    (r"malloc()",        ["<stdlib.h>"]),
    # mblen - get number of bytes in a character
    (r"mblen()",         ["<stdlib.h>"]),
    # mbrlen - get number of bytes in a character (restartable)
    (r"mblren()",        ["<wchar.h>"]),
    # mbrtowc - convert a character to a wide-character code (restartable)
    (r"mbrtowc()",       ["<wchar.h>"]),
    # mbsinit - determine conversion object status
    (r"mbsinit()",       ["<wchar.h>"]),
    # mbsrtowcs - convert a character string to a wide-character string (restartable)
    (r"mbsrtowcs()",     ["<wchar.h>"]),
    # mbstowcs - convert a character string to a wide-character string
    (r"mbstowcs()",      ["<wchar.h>"]),
    # mbtowc - convert a character to a wide-character code
    (r"mbtowcs()",       ["<stdlib.h>"]),
    # mkdir - make a directory
    (r"mkdir()",         ["<sys/types.h>", "<sys/stat.h>"]),
    # mkfifo - make a FIFO special file
    (r"mkfifo()",        ["<sys/types.h>", "<sys/stat.h>"]),
    # mknod - make a directory, a special or regular file
    (r"mknod()",         ["<sys/stat.h>"]),
    # mkstemp - make a unique file name
    (r"mkstemp()",       ["<stdlib.h>"]),
    # mktemp - make a unique filename
    (r"mktemp()",        ["<stdlib.h>"]),
    # convert broken-down time into time since the Epoch
    (r"mktime()",        ["<time.h>"]),
    # sys/mman.h - memory management declarations
    (r"mlock()",         ["<sys/mman.h>"]),
    (r"mlockall()",      ["<sys/mman.h>"]),
    (r"mmap()",          ["<sys/mman.h>"]),
    (r"mprotect()",      ["<sys/mman.h>"]),
    (r"msync()",         ["<sys/mman.h>"]),
    (r"munlock()",       ["<sys/mman.h>"]),
    (r"munlockall()",    ["<sys/mman.h>"]),
    (r"munmap()",        ["<sys/mman.h>"]),
    (r"shm_open()",      ["<sys/mman.h>"]),
    (r"shm_unlink()",    ["<sys/mman.h>"]),
    # modf - decompose a floating-point number
    (r"modf()",          ["<math.h>"]),
    # monetary.h - monetary types
    (r"strfmon()",       ["<monetary.h>"]),
    # mqueue.h - message queues
    (r"mq_close()",      ["<mqueue.h>"]),
    (r"mq_getattr()",    ["<mqueue.h>"]),
    (r"mq_notify()",     ["<mqueue.h>"]),
    (r"mq_open()",       ["<mqueue.h>"]),
    (r"mq_receive()",    ["<mqueue.h>"]),
    (r"mq_send()",       ["<mqueue.h>"]),
    (r"mq_setattr()",    ["<mqueue.h>"]),
    (r"mq_unlink()",     ["<mqueue.h>"]),
    # sys/msg.h - message queue structures
    (r"msgctl()",        ["<sys/msg.h>"]),
    (r"msgget()",        ["<sys/msg.h>"]),
    (r"msgrcv()",        ["<sys/msg.h>"]),
    (r"msgsnd()",        ["<sys/msg.h>"]),
    # nanosleep - high resolution sleep
    (r"nanosleep()",     ["<time.h>"]),
    # nextafter - next representable double-precision floating-point number
    (r"nextafter()",     ["<math.h>"]),
    # change nice value of a process
    (r"nice()",          ["<unistd.h>"]),
    # nl_langinfo - language information
    (r"nl_langinfo()",   ["<langinfo.h>"]),
    # open - open a file
    (r"open()",          ["<sys/types.h>", "<sys/stat.h>", "<fcntl.h>"]),
    # opendir - open a directory
    (r"opendir()",       ["<sys/types.h>", "<dirent.h>"]),
    # pause - suspend the thread until signal is received
    (r"pause()",         ["<unistd.h>"]),
    # pclose - close a pipe stream to or from a process
    (r"pclose()",        ["<stdio.h>"]),
    # perror - write error messages to standard error
    (r"perror()",        ["<stdio.h>"]),
    # pipe - create an interprocess channel
    (r"pipe()",          ["<unistd.h>"]),
    # poll - input/output multiplexing
    (r"poll()",          ["<poll.h>"]),
    # popen - initiate pipe streams to or from a process
    (r"popen()",         ["<stdio.h>"]),
    # pow - power function
    (r"pow()",           ["<math.h>"]),
    # pread - read from a file
    ("pread()",          ["<unistd.h>"]),
    # pthread.h - threads
    (r"pthread_attr_destroy()",            ["<pthread.h>"]),
    (r"pthread_attr_getdetachstate()",     ["<pthread.h>"]),
    (r"pthread_attr_getguardsize()",       ["<pthread.h>"]),
    (r"pthread_attr_getinheritsched()",    ["<pthread.h>"]),
    (r"pthread_attr_getschedparam()",      ["<pthread.h>"]),
    (r"pthread_attr_getschedpolicy()",     ["<pthread.h>"]),
    (r"pthread_attr_getscope()",           ["<pthread.h>"]),
    (r"pthread_attr_getstackaddr()",       ["<pthread.h>"]),
    (r"pthread_attr_getstacksize()",       ["<pthread.h>"]),
    (r"pthread_attr_init()",               ["<pthread.h>"]),
    (r"pthread_attr_setdetachstate()",     ["<pthread.h>"]),
    (r"pthread_attr_setguardsize()",       ["<pthread.h>"]),
    (r"pthread_attr_setinheritsched()",    ["<pthread.h>"]),
    (r"pthread_attr_setschedparam()",      ["<pthread.h>"]),
    (r"pthread_attr_setschedpolicy()",     ["<pthread.h>"]),
    (r"pthread_attr_setscope()",           ["<pthread.h>"]),
    (r"pthread_attr_setstackaddr()",       ["<pthread.h>"]),
    (r"pthread_attr_setstacksize()",       ["<pthread.h>"]),
    (r"pthread_cancel()",                  ["<pthread.h>"]),
    (r"pthread_cleanup_push()",            ["<pthread.h>"]),
    (r"pthread_cleanup_pop()",             ["<pthread.h>"]),
    (r"pthread_cond_broadcast()",          ["<pthread.h>"]),
    (r"pthread_cond_destroy()",            ["<pthread.h>"]),
    (r"pthread_cond_init()",               ["<pthread.h>"]),
    (r"pthread_cond_signal()",             ["<pthread.h>"]),
    (r"pthread_cond_timedwait()",          ["<pthread.h>"]),
    (r"pthread_cond_wait()",               ["<pthread.h>"]),
    (r"pthread_condattr_destroy()",        ["<pthread.h>"]),
    (r"pthread_condattr_getpshared()",     ["<pthread.h>"]),
    (r"pthread_condattr_init()",           ["<pthread.h>"]),
    (r"pthread_condattr_setpshared()",     ["<pthread.h>"]),
    (r"pthread_create()",                  ["<pthread.h>"]),
    (r"pthread_detach()",                  ["<pthread.h>"]),
    (r"pthread_equal()",                   ["<pthread.h>"]),
    (r"pthread_exit()",                    ["<pthread.h>"]),
    (r"pthread_getconcurrency()",          ["<pthread.h>"]),
    (r"pthread_getschedparam()",           ["<pthread.h>"]),
    (r"pthread_getspecific()",             ["<pthread.h>"]),
    (r"pthread_join()",                    ["<pthread.h>"]),
    (r"pthread_key_create()",              ["<pthread.h>"]),
    (r"pthread_key_delete()",              ["<pthread.h>"]),
    (r"pthread_mutex_destroy()",           ["<pthread.h>"]),
    (r"pthread_mutex_getprioceiling()",    ["<pthread.h>"]),
    (r"pthread_mutex_init()",              ["<pthread.h>"]),
    (r"pthread_mutex_lock()",              ["<pthread.h>"]),
    (r"pthread_mutex_setprioceiling()",    ["<pthread.h>"]),
    (r"pthread_mutex_trylock()",           ["<pthread.h>"]),
    (r"pthread_mutex_unlock()",            ["<pthread.h>"]),
    (r"pthread_mutexattr_destroy()",       ["<pthread.h>"]),
    (r"pthread_mutexattr_getprioceiling()",["<pthread.h>"]),
    (r"pthread_mutexattr_getprotocol()",   ["<pthread.h>"]),
    (r"pthread_mutexattr_getpshared()",    ["<pthread.h>"]),
    (r"pthread_mutexattr_gettype()",       ["<pthread.h>"]),
    (r"pthread_mutexattr_init()",          ["<pthread.h>"]),
    (r"pthread_mutexattr_setprioceiling()",["<pthread.h>"]),
    (r"pthread_mutexattr_setprotocol()",   ["<pthread.h>"]),
    (r"pthread_mutexattr_setpshared()",    ["<pthread.h>"]),
    (r"pthread_mutexattr_settype()",       ["<pthread.h>"]),
    (r"pthread_once()",                    ["<pthread.h>"]),
    (r"pthread_rwlock_destroy()",          ["<pthread.h>"]),
    (r"pthread_rwlock_init()",             ["<pthread.h>"]),
    (r"pthread_rwlock_rdlock()",           ["<pthread.h>"]),
    (r"pthread_rwlock_tryrdlock()",        ["<pthread.h>"]),
    (r"pthread_rwlock_trywrlock()",        ["<pthread.h>"]),
    (r"pthread_rwlock_unlock()",           ["<pthread.h>"]),
    (r"pthread_rwlock_wrlock()",           ["<pthread.h>"]),
    (r"pthread_rwlockattr_destroy()",      ["<pthread.h>"]),
    (r"pthread_rwlockattr_getpshared()",   ["<pthread.h>"]),
    (r"pthread_rwlockattr_init()",         ["<pthread.h>"]),
    (r"pthread_rwlockattr_setpshared()",   ["<pthread.h>"]),
    (r"pthread_self()",                    ["<pthread.h>"]),
    (r"pthread_setcancelstate()",          ["<pthread.h>"]),
    (r"pthread_setcanceltype()",           ["<pthread.h>"]),
    (r"pthread_setconcurrency()",          ["<pthread.h>"]),
    (r"pthread_setschedparam()",           ["<pthread.h>"]),
    (r"pthread_setspecific()",             ["<pthread.h>"]),
    (r"pthread_testcancel()",              ["<pthread.h>"]),
    # ptsname - get name of the slave pseudo-terminal device
    (r"ptsname()",       ["<stdlib.h>"]),
    # putc - put a byte on a stream
    (r"putc()",          ["<stdio.h>"]),
    # putc_unlocked - stdio with explicit client locking
    (r"putc_unlocked()", ["<stdio.h>"]),
    # putchar - put byte on stdout stream
    (r"putchar()",       ["<stdio.h>"]),
    # putchar_unlocked - stdio with explicit client locking
    (r"putchar_unlocked()",                ["<stdio.h>"]),
    # putenv - change or add a value to environment
    (r"putenv()",        ["<stdlib.h>"]),
    # putmsg, putpmsg - send a message on a STREAM
    (r"putmsg()",        ["<stropts.h>"]),
    (r"putpmsg()",       ["<stropts.h>"]),
    # puts - put a string on standard output
    (r"puts()",          ["<stdio.h>"]),
    # putw - put a word on a stream
    (r"putw()",          ["<stdio.h>"]),
    # putwc - put a wide-character on a stream
    (r"putwc()",         ["<stdio.h>", "<wchar.h>"]),
    # putwchar - put a wide character from a stdin stream
    (r"putwchar()",      ["<wchar.h>"]),
    # qsort - sort a table of data
    (r"qsort()",         ["<stdlib.h>"]),
    # raise - send a signal to the executing process
    (r"raise()",         ["<signal.h>"]),
    # rand, rand_r - pseudo-random number generator
    (r"rand()",          ["<stdlib.h>"]),
    (r"srand()",         ["<stdlib.h>"]),
    (r"rand_r()",        ["<stdlib.h>"]),
    # random - generate pseudorandom number
    (r"random()",        ["<stdlib.h>"]),
    # re_comp.h - regular-expression-matching functions for re_comp()
    (r"re_comp()",       ["<re_comp.h>"]),
    (r"re_exec()",       ["<re_comp.h>"]),
    # read, readv, pread - read from a file
    ("read()",           ["<unistd.h>"]),
    ("readv()",          ["<sys/uio.h>"]),
    # readdir, readdir_r - read directory
    (r"readdir()",       ["<sys/types.h>", "<dirent.h>"]),
    (r"readdir_r()",     ["<sys/types.h>", "<dirent.h>"]),
    # readlink - read the contents of a symbolic link
    ("readlink()",       ["<unistd.h>"]),
    # realloc - memory reallocator
    ("realloc()",        ["<unistd.h>"]),
    # realpath - resolve a pathname
    ("realpath()",       ["<stdlib.h>"]),
    # regcomp, regexec, regerror, regfree - regular expression matching
    (r"regcomp()",       ["<sys/types.h>", "<regex.h>"]),
    (r"regexec()",       ["<sys/types.h>", "<regex.h>"]),
    (r"regerror()",      ["<sys/types.h>", "<regex.h>"]),
    (r"regfree()",       ["<sys/types.h>", "<regex.h>"]),
    # remainder - remainder function
    (r"remainder()",     ["<math.h>"]),
    # remove - remove files
    (r"remove()",        ["<stdio.h>"]),
    # rename - rename a file
    (r"rename()",        ["<stdio.h>"]),
    # rewind - reset file position indicator in a stream
    (r"rewind()",        ["<stdio.h>"]),
    # rewinddir - reset position of directory stream to the beginning of a directory
    (r"rewinddir()",     ["<sys/types.h>", "<dirent.h>"]),
    # rindex - character string operations
    (r"rindex()",        ["<strings.h>"]),
    # rint - round-to-nearest integral value
    (r"rint()",          ["<math.h>"]),
    # rmdir - remove a directory
    ("rmdir()",          ["<unistd.h>"]),
    # scalb - load exponent of a radix-independent floating-point number
    (r"scalb()",         ["<math.h>"]),
    # scanf - convert formatted input
    (r"scanf()",        ["<stdio.h>"]),
    # sched.h - execution scheduling
    (r"sched_get_priority_max()",      ["<sched.h>"]),
    (r"sched_get_priority_min()",      ["<sched.h>"]),
    (r"sched_getparam()",              ["<sched.h>"]),
    (r"sched_getscheduler()",          ["<sched.h>"]),
    (r"sched_rr_get_interval()",       ["<sched.h>"]),
    (r"sched_setparam()",              ["<sched.h>"]),
    (r"sched_setscheduler()",          ["<sched.h>"]),
    (r"sched_yield()",                 ["<sched.h>"]),
    # seekdir - set position of directory stream
    (r"seekdir()",       ["<sys/types.h>", "<dirent.h>"]),
    # select - synchronous I/O multiplexing
    (r"select()",        ["<sys/time.h>"]),
    # semaphore.h - semaphores
    (r"sem_close()",     ["<semaphore.h>"]),
    (r"sem_destroy()",   ["<semaphore.h>"]),
    (r"sem_getvalue()",  ["<semaphore.h>"]),
    (r"sem_init()",      ["<semaphore.h>"]),
    (r"sem_open()",      ["<semaphore.h>"]),
    (r"sem_post()",      ["<semaphore.h>"]),
    (r"sem_trywait()",   ["<semaphore.h>"]),
    (r"sem_unlink()",    ["<semaphore.h>"]),
    (r"sem_wait()",      ["<semaphore.h>"]),
    # sys/sem.h - semaphore facility
    (r"semctl()",        ["<sys/sem.h>"]),
    (r"semget()",        ["<sys/sem.h>"]),
    (r"semop()",         ["<sys/sem.h>"]),
    # setbuf - assign buffering to a stream
    (r"setbuf()",        ["<stdio.h>"]),
    # setgid - set-group-ID
    (r"setgid()",        ["<sys/types.h>", "<unistd.h>"]),
    # setgrent - reset group database to first entry
    (r"setgrent()",      ["<grp.h>"]),
    # setkey - set encoding key
    (r"setkey()",        ["<stdlib.h>"]),
    # setpgid - set process group ID for job control
    (r"setpgid()",       ["<sys/types.h>", "<unistd.h>"]),
    # setpgrp - set process group ID
    (r"setpgrp()",       ["<unistd.h>"]),
    # setregid - set real and effective group IDs
    (r"setregid()",      ["<unistd.h>"]),
    # setreuid - set real and effective user IDs
    (r"setreuid()",      ["<unistd.h>"]),
    # setsid - create session and set process group ID
    (r"setsid()",        ["<sys/types.h>", "<unistd.h>"]),
    # setuid - set-user-ID
    (r"setuid()",        ["<sys/types.h>", "<unistd.h>"]),
    # setvbuf - assign buffering to a stream
    (r"setvbuf()",       ["<stdio.h>"]),
    # sys/shm.h - shared memory facility
    (r"shmat()",         ["<sys/shm.h>"]),
    (r"shmctl()",        ["<sys/shm.h>"]),
    (r"shmdt()",         ["<sys/shm.h>"]),
    (r"shmget()",        ["<sys/shm.h>"]),
    # setjmp.h - stack environment declarations
    (r"longjmp()",       ["<setjmp.h>"]),
    (r"siglongjmp()",    ["<setjmp.h>"]),
    (r"_longjmp()",      ["<setjmp.h>"]),
    (r"setjmp()",        ["<setjmp.h>"]),
    (r"sigsetjmp()",     ["<setjmp.h>"]),
    (r"_setjmp()",       ["<setjmp.h>"]),
    # signal.h - signals
    (r"bsd_signal()",    ["<signal.h>"]),
    (r"kill()",          ["<signal.h>"]),
    (r"killpg()",        ["<signal.h>"]),
    (r"pthread_kill()",  ["<signal.h>"]),
    (r"pthread_sigmask()",    ["<signal.h>"]),
    (r"raise()",         ["<signal.h>"]),
    (r"sigaction()",     ["<signal.h>"]),
    (r"sigaddset()",     ["<signal.h>"]),
    (r"sigaltstack()",   ["<signal.h>"]),
    (r"sigdelset()",     ["<signal.h>"]),
    (r"sigemptyset()",   ["<signal.h>"]),
    (r"sigfillset()",    ["<signal.h>"]),
    (r"sighold()",       ["<signal.h>"]),
    (r"sigignore()",     ["<signal.h>"]),
    (r"siginterrupt()",  ["<signal.h>"]),
    (r"sigismember()",   ["<signal.h>"]),
    (r"signal()",        ["<signal.h>"]),
    (r"sigpause()",      ["<signal.h>"]),
    (r"sigpending()",    ["<signal.h>"]),
    (r"sigprocmask()",   ["<signal.h>"]),
    (r"sigqueue()",      ["<signal.h>"]),
    (r"sigrelse()",      ["<signal.h>"]),
    (r"sigset()",        ["<signal.h>"]),
    (r"sigstack()",      ["<signal.h>"]),
    (r"sigsuspend()",    ["<signal.h>"]),
    (r"sigtimedwait()",  ["<signal.h>"]),
    (r"sigwait()",       ["<signal.h>"]),
    (r"sigwaitinfo()",   ["<signal.h>"]),
    # sin - sine function
    (r"sin()",           ["<math.h>"]),
    # sinh - hyperbolic sine function
    (r"sinh()",          ["<math.h>"]),
    # sleep - suspend execution for an interval of time
    (r"sleep()",         ["<unistd.h>"]),
    # fprintf, printf, snprintf, sprintf - print formatted output
    (r"fprintf()",       ["<stdio.h>"]),
    (r"printf()",        ["<stdio.h>"]),
    (r"snprintf()",      ["<stdio.h>"]),
    (r"sprintf()",       ["<stdio.h>"]),
    # sqrt - square root function
    (r"sqrt()",          ["<math.h>"]),
    # stat - get file status
    (r"stat()",          ["<sys/types.h>", "<sys/stat.h>"]),
    # stdarg.h - handle variable argument list
    (r"va_start()",      ["<stdarg.h>"]),
    (r"va_arg()",        ["<stdarg.h>"]),
    (r"va_end()",        ["<stdarg.h>"]),
    # stddef.h - standard type definitions
    (r"offsetof()",      ["<stddef.h>"]),
    # step - pattern match with regular expressions
    (r"step()",          ["<regexp.h>"]),
    # strcasecmp, strncasecmp - case-insensitive string comparisons
    (r"strcasecmp()",    ["<strings.h>"]),
    (r"strncasecmp()",   ["<strings.h>"]),
    # string.h - string operations
    (r"memccpy()",       ["<string.h>"]),
    (r"memchr()",        ["<string.h>"]),
    (r"memcmp()",        ["<string.h>"]),
    (r"memcpy()",        ["<string.h>"]),
    (r"memmove()",       ["<string.h>"]),
    (r"memset()",        ["<string.h>"]),
    (r"strcat()",        ["<string.h>"]),
    (r"strchr()",        ["<string.h>"]),
    (r"strcmp()",        ["<string.h>"]),
    (r"strcoll()",       ["<string.h>"]),
    (r"strcpy()",        ["<string.h>"]),
    (r"strcspn()",       ["<string.h>"]),
    (r"strdup()",        ["<string.h>"]),
    (r"strerror()",      ["<string.h>"]),
    (r"strlen()",        ["<string.h>"]),
    (r"strncat()",       ["<string.h>"]),
    (r"strncmp()",       ["<string.h>"]),
    (r"strncpy()",       ["<string.h>"]),
    (r"strpbrk()",       ["<string.h>"]),
    (r"strrchr()",       ["<string.h>"]),
    (r"strspn()",        ["<string.h>"]),
    (r"strstr()",        ["<string.h>"]),
    (r"strtok()",        ["<string.h>"]),
    (r"strtok_r()",      ["<string.h>"]),
    (r"strxfrm()",       ["<string.h>"]),
    # wctype.h - wide-character classification and mapping utilities
    (r"iswalnum()",      ["<wctype.h>"]),
    (r"iswalpha()",      ["<wctype.h>"]),
    (r"iswascii()",      ["<wctype.h>"]),
    (r"iswcntrl()",      ["<wctype.h>"]),
    (r"iswdigit()",      ["<wctype.h>"]),
    (r"iswgraph()",      ["<wctype.h>"]),
    (r"iswlower()",      ["<wctype.h>"]),
    (r"iswprint()",      ["<wctype.h>"]),
    (r"iswpunct()",      ["<wctype.h>"]),
    (r"iswspace()",      ["<wctype.h>"]),
    (r"iswupper()",      ["<wctype.h>"]),
    (r"iswxdigit()",     ["<wctype.h>"]),
    (r"iswctype()",      ["<wctype.h>"]),
    (r"towctrans()",     ["<wctype.h>"]),
    (r"towlower()",      ["<wctype.h>"]),
    (r"towupper()",      ["<wctype.h>"]),
    (r"wctrans()",       ["<wctype.h>"]),
    (r"wctype()",        ["<wctype.h>"]),
    # strftime - convert date and time to a string
    (r"strftime()",      ["<time.h>"]),
    # strptime - date and time conversion
    (r"strptime()",      ["<time.h>"]),
    # strtod - convert string to a double-precision number
    (r"strtod()",        ["<stdlib.h>"]),
    # strtol - convert string to a long integer
    (r"strtol()",        ["<stdlib.h>"]),
    # strtoul - convert string to an unsigned long
    (r"strtoul()",       ["<stdlib.h>"]),
    # swab - swap bytes
    (r"swab()",          ["<stdlib.h>"]),
    # symlink - make symbolic link to a file
    (r"symlink()",       ["<stdlib.h>"]),
    # sync - schedule filesystem updates
    (r"sync()",          ["<stdlib.h>"]),
    # sysconf - get configurable system variables
    (r"sysconf()",       ["<stdlib.h>"]),
    # system - issue a command
    (r"system()",        ["<stdlib.h>"]),
    # sys/wait.h - declarations for waiting
    (r"wait()",          ["<sys/types.h>", "<sys/wait.h>"]),
    (r"wait3()",         ["<sys/types.h>", "<sys/wait.h>"]),
    (r"waitid()",        ["<sys/types.h>", "<sys/wait.h>"]),
    (r"waitpid()",       ["<sys/types.h>", "<sys/wait.h>"]),
    (r"WEXITSTATUS()",   ["<sys/types.h>", "<sys/wait.h>"]),
    (r"WIFCONTINUED()",  ["<sys/types.h>", "<sys/wait.h>"]),
    (r"WIFEXITED()",     ["<sys/types.h>", "<sys/wait.h>"]),
    (r"WIFSIGNALED()",   ["<sys/types.h>", "<sys/wait.h>"]),
    (r"WIFSTOPPED()",    ["<sys/types.h>", "<sys/wait.h>"]),
    (r"WSTOPSIG()",      ["<sys/types.h>", "<sys/wait.h>"]),
    (r"WTERMSIG()",      ["<sys/types.h>", "<sys/wait.h>"]),
    # tan - tangent function
    (r"tan()",           ["<math.h>"]),
    # tanh - hyperbolic tangent function
    (r"tanh()",          ["<math.h>"]),
    # tcgetpgrp - get the foreground process group ID
    (r"tcgetpgrp()",     ["<sys/types.h>", "<unistd.h>"]),
    # tcsetpgrp - set the foreground process group ID
    (r"tcsetpgrp()",     ["<sys/types.h>", "<unistd.h>"]),
    # tdelete - delete node from binary search tree
    (r"tdelete()",       ["<search.h>"]),
    # telldir - current location of a named directory stream
    (r"telldir()",       ["<dirent.h>"]),
    # tempnam - create a name for a temporary file
    (r"tempnam()",       ["<stdio.h>"]),
    # termios.h - define values for termios
    (r"cfgetispeed()",   ["<termios.h>"]),
    (r"cfgetospeed()",   ["<termios.h>"]),
    (r"cfsetispeed()",   ["<termios.h>"]),
    (r"cfsetospeed()",   ["<termios.h>"]),
    (r"tcdrain()",       ["<termios.h>"]),
    (r"tcflow()",        ["<termios.h>"]),
    (r"tcflush()",       ["<termios.h>"]),
    (r"tcgetattr()",     ["<termios.h>"]),
    (r"tcgetsid()",      ["<termios.h>"]),
    (r"tcsendbreak()",   ["<termios.h>"]),
    (r"tcsetattr()",     ["<termios.h>"]),
    # tdelete, tfind, tsearch, twalk - manage a binary search tree
    (r"tsearch()",       ["<termios.h>"]),
    (r"tfind()",         ["<termios.h>"]),
    (r"tdelete()",       ["<termios.h>"]),
    (r"twalk()",         ["<termios.h>"]),
    # time - get time
    (r"time()",          ["<time.h>"]),
    # timer_create - create a per-process timer
    (r"timer_create()",  ["<time.h>", "<signal.h>"]),
    # timer_delete - delete a per-process timer
    (r"timer_delete()",  ["<time.h>", "<signal.h>"]),
    # timer_settime, timer_gettime, timer_getoverrun - per-process timers
    (r"timer_settime()",      ["<time.h>"]),
    (r"timer_gettime()",      ["<time.h>"]),
    (r"timer_getoverrun()",   ["<time.h>"]),
    # times - get process and waited-for child process times
    (r"times()",         ["<sys/time.h>"]),
    # tmpfile - create a temporary file
    (r"tmpfile()",       ["<stdio.h>"]),
    # tmpnam - create a name for a temporary file
    (r"tmpnam()",        ["<stdio.h>"]),
    # truncate - truncate a file to a specified length
    (r"truncate()",      ["<stdio.h>"]),
    # ttyname, ttyname_r - find pathname of a terminal
    ("ttyname()",        ["<unistd.h>"]),
    ("ttyname_r()",      ["<unistd.h>"]),
    # ttyslot - find the slot of the current user in the user accounting database
    ("ttyslot()",        ["<unistd.h>"]),
    # tzset - set time zone conversion information
    ("tzset()",          ["<time.h>"]),
    # ualarm - set the interval timer
    ("ualarm()",         ["<unistd.h>"]),
    # ulimit - get and set process limits
    ("ulimit()",         ["<ulimit.h>"]),
    # umask - set and get file mode creation mask
    (r"umask()",         ["<sys/stat.h>", "<sys/types.h>"]),
    # uname - get name of current system
    ("uname()",          ["<sys/utsname.h>"]),
    # ungetc - push byte back into input stream
    (r"ungetc()",        ["<stdio.h>"]),
    # ungetwc - push wide-character code back into input stream
    (r"ungetwc()",       ["<stdio.h>", "<wchar.h>"]),
    # unlink - remove a directory entry
    ("unlink()",         ["<unistd.h>"]),
    # unlockpt - unlock a pseudo-terminal master/slave pair
    (r"unlockpt()",      ["<stdlib.h>"]),
    # usleep - suspend execution for an interval
    ("usleep()",         ["<unistd.h>"]),
    # utime - set file access and modification times
    (r"utime()",         ["<sys/types.h>", "<utime.h>"]),
    # utimes - set file access and modification times
    (r"utimes()",        ["<sys/time.h>"]),
    # valloc - page-aligned memory allocator
    (r"valloc()",        ["<stdlib.h>"]),
    # vfork - create new process; share virtual memory
    ("vfork()",          ["<unistd.h>"]),
    # vfprintf, vprintf, vsnprintf, vsprintf - format output of a stdarg argument list
    (r"vfprintf()",      ["<stdarg.h>", "<stdio.h>"]),
    (r"vprintf()",       ["<stdarg.h>", "<stdio.h>"]),
    (r"vsnprintf()",     ["<stdarg.h>", "<stdio.h>"]),
    (r"vsprintf()",      ["<stdarg.h>", "<stdio.h>"]),
    # vfwprintf, vwprintf, vswprintf - wide-character formatted output of a stdarg argument list
    (r"vwprintf()",      ["<stdarg.h>", "<stdio.h>", "<wchar.h>"]),
    (r"vfwprintf()",     ["<stdarg.h>", "<stdio.h>", "<wchar.h>"]),
    (r"vswprintf()",     ["<stdarg.h>", "<stdio.h>", "<wchar.h>"]),
    # wchar.h - wide-character types
    (r"wcrtomb()",       ["<wchar.h>"]),   # SuSv2 erroneously says <stdio.h>
    (r"wcscat()",        ["<wchar.h>"]),
    (r"wcschr()",        ["<wchar.h>"]),
    (r"wcscmp()",        ["<wchar.h>"]),
    (r"wcscoll()",       ["<wchar.h>"]),
    (r"wcscpy()",        ["<wchar.h>"]),
    (r"wcscpy()",        ["<wchar.h>"]),
    (r"wcsftime()",      ["<wchar.h>"]),
    (r"wcslen()",        ["<wchar.h>"]),
    (r"wcsncat()",       ["<wchar.h>"]),
    (r"wcsncmp()",       ["<wchar.h>"]),
    (r"wcsncpy()",       ["<wchar.h>"]),
    (r"wcspbrk()",       ["<wchar.h>"]),
    (r"wcsrchr()",       ["<wchar.h>"]),
    (r"wcsrtombs()",     ["<wchar.h>"]),
    (r"wcsspn()",        ["<wchar.h>"]),
    (r"wcsstr()",        ["<wchar.h>"]),
    (r"wcstod()",        ["<wchar.h>"]),
    (r"wcstok()",        ["<wchar.h>"]),
    (r"wcstol()",        ["<wchar.h>"]),
    (r"wcstoul()",       ["<wchar.h>"]),
    (r"wcswcs()",        ["<wchar.h>"]),
    (r"wcswidth()",      ["<wchar.h>"]),
    (r"wcsxfrm()",       ["<wchar.h>"]),
    (r"wctob()",         ["<wchar.h>"]),
    (r"wctype()",        ["<wchar.h>"]),
    (r"wcwidth()",       ["<wchar.h>"]),
    (r"wmemchr()",       ["<wchar.h>"]),
    (r"wmemcmp()",       ["<wchar.h>"]),
    (r"wmemcpy()",       ["<wchar.h>"]),
    (r"wmemmove()",      ["<wchar.h>"]),
    (r"wmemset()",       ["<wchar.h>"]),
    (r"wprintf()",       ["<wchar.h>"]),
    (r"wscanf()",        ["<wchar.h>"]),
    # wordexp.h - word-expansion types
    (r"wordexp()",       ["<wordexp.h>"]),
    (r"wordfree()",      ["<wordexp.h>"]),
    # write, writev, pwrite - write on a file
    (r"write()",         ["<unistd.h>"]),
    (r"pwrite()",        ["<unistd.h>"]),
    (r"writev()",        ["<sys/uio.h>"]),
    # y0, y1, yn - Bessel functions of the second kind
    (r"y0()",            ["<math.h>"]),
    (r"y1()",            ["<math.h>"]),
    (r"yn()",            ["<math.h>"]),

    # Headers mandated by SuS Version 2 Network Services.
    # sys/socket.h - Internet Protocol family
    (r"accept()",        ["<sys/socket.h>"]),
    (r"bind()",          ["<sys/socket.h>"]),
    (r"connect()",       ["<sys/socket.h>"]),
    (r"getpeername()",   ["<sys/socket.h>"]),
    (r"getsockname()",   ["<sys/socket.h>"]),
    (r"getsockopt()",    ["<sys/socket.h>"]),
    (r"listen()",        ["<sys/socket.h>"]),
    (r"recv()",          ["<sys/socket.h>"]),
    (r"recvfrom()",      ["<sys/socket.h>"]),
    (r"recvmsg()",       ["<sys/socket.h>"]),
    (r"send()",          ["<sys/socket.h>"]),
    (r"sendmsg()",       ["<sys/socket.h>"]),
    (r"sendto()",        ["<sys/socket.h>"]),
    (r"setsockopt()",    ["<sys/socket.h>"]),
    (r"shutdown()",      ["<sys/socket.h>"]),
    (r"socket()",        ["<sys/socket.h>"]),
    (r"socketpair()",    ["<sys/socket.h>"]),
    # arpa/inet.h - definitions for internet operations
    (r"inet_addr()",     ["<arpa/inet.h>"]),
    (r"inet_lnaof()",    ["<arpa/inet.h>"]),
    (r"inet_makeaddr()", ["<arpa/inet.h>"]),
    (r"inet_netof()",    ["<arpa/inet.h>"]),
    (r"inet_network()",  ["<arpa/inet.h>"]),
    (r"inet_ntoa()",     ["<arpa/inet.h>"]),
    (r"htonl()",         ["<arpa/inet.h>"]),
    (r"htons()",         ["<arpa/inet.h>"]),
    (r"ntohl()",         ["<arpa/inet.h>"]),
    (r"ntohs()",         ["<arpa/inet.h>"]),
    # netdb.h - definitions for network database operations
    (r"endhostent()",      ["<netdb.h>"]),
    (r"endnetent()",       ["<netdb.h>"]),
    (r"endprotoent()",     ["<netdb.h>"]),
    (r"endservent()",      ["<netdb.h>"]),
    (r"gethostbyaddr()",   ["<netdb.h>"]),
    (r"gethostbyname()",   ["<netdb.h>"]),
    (r"gethostent()",      ["<netdb.h>"]),
    (r"getnetbyaddr()",    ["<netdb.h>"]),
    (r"getnetbyname()",    ["<netdb.h>"]),
    (r"getnetent()",       ["<netdb.h>"]),
    (r"getprotobyname()",  ["<netdb.h>"]),
    (r"getprotobynumber()",["<netdb.h>"]),
    (r"getprotoent()",     ["<netdb.h>"]),
    (r"getservbyname()",   ["<netdb.h>"]),
    (r"getservbyport()",   ["<netdb.h>"]),
    (r"getservent()",      ["<netdb.h>"]),
    (r"sethostent()",      ["<netdb.h>"]),
    (r"setnetent()",       ["<netdb.h>"]),
    (r"setprotoent()",     ["<netdb.h>"]),
    (r"setservent()",      ["<netdb.h>"]),
    # unistd.h - standard symbolic constants and types
    (r"gethostname()",     ["<unistd.h>"]),
    # stdbool.h - standard boolean type
    (r"=\s*true",          ["<stdbool.h>"]),
    (r"=\s*false",         ["<stdbool.h>"]),

    # Dependencies observed on systems other than the Linux this was
    # developed under.
    (r"<sys/socket.h>",    ["<sys/stat.h>", "<sys/types.h>"]),
    (r"<arpa/inet.h>",     ["<netinet/in.h>"]),
    )

class Baton:
    "Ship progress indications to stderr."
    def __init__(self, prompt, endmsg=None):
        self.stream = sys.stderr
        self.stream.write(prompt + "...")
        if os.isatty(self.stream.fileno()):
            self.stream.write(" \b")
        self.stream.flush()
        self.count = 0
        self.endmsg = endmsg
        self.time = time.time()
        return

    def twirl(self, ch=None):
        if self.stream is None:
            return
        if os.isatty(self.stream.fileno()):
            if ch:
                self.stream.write(ch)
            else:
                self.stream.write("-/|\\"[self.count % 4])
                self.stream.write("\b")
            self.stream.flush()
        self.count = self.count + 1
        return

    def end(self, msg=None):
        if msg == None:
            msg = self.endmsg
        if self.stream:
            self.stream.write("...(%2.2f sec) %s.\n" % (time.time() - self.time, msg))
        return

class InclusionMap:
    "Map the inclusion dependencies of a set of files and directories."
    @staticmethod
    def c_source(filename):
        "Predicate: return true if the filename appears to be C or C++ source."
        return filename.endswith(".c") or filename.endswith(".cpp") or filename.endswith(".cc") or filename.endswith(".h")
    def __init__(self, roots, ignore, excludes, verbosity):
        "Build the initial inclusion map."
        self.verbosity = verbosity
        self.files = []
        compiled = []
        for (r, h) in requirements:
            if r.endswith("()"):
                # The prefix is intended to exclude false suffix matches:
                # also, excluding : prevents matching on C++ method names.
                c = re.compile(r"[^a-zA-Z0-9:_]" + r.replace("()", r"\s*\("))
            else:
                c = re.compile(r)
            compiled.append((r, c, h))
        for root in roots:
            if not os.path.isdir(root):
                if excludes and excludes.search(root):
                    if verbose > 1:
                        print("deheader: %s excluded" % root)
                elif InclusionMap.c_source(root):
                    self.files.append(root)
                else:
                    sys.stderr.write("deheader: can't analyze %s\n" % root)
            else:
                sublist = []
                for root, dirs, files in os.walk(root):
                    dirs = [x for x in dirs if not x.startswith(".")]
                    for name in files:
                        path = os.path.join(root, name)
                        if excludes and excludes.search(path):
                            if verbose > 1:
                                print("deheader: %s excluded" % root)
                        elif InclusionMap.c_source(path):
                            sublist.append(path)
                self.files += sublist
            self.files.sort()
        self.depends_on = {}
        self.requires = {}
        for sourcefile in self.files:
            includes = []
            requires = []
            seen = []
            conditions = []
            for line in open(sourcefile):
                c = match_preproc(["ifndef", "ifdef", "if"], line)
                if c is not False:
                    conditions.append(c)
                elif match_preproc("endif", line) is not False:
                    conditions.pop()
                else:
                    f = match_preproc("include", line)
                    if f is not False:
                        if verbosity >= PROGRESS_DEBUG:
                            name = trim(f)
                            print("deheader: %s includes %s" % (sourcefile, name))
                        if ignore and ignore.search(line):
                            if verbosity >= PROGRESS_DEBUG:
                                print("deheader: ignoring %s (exclusion match with %s)." % (name, ignore.pattern))
                            continue
                        if not conditions or conditions == ["S_SPLINT_S"]:
                            includes.append(line)
                        elif verbose > 1:
                            print("deheader: ignoring %s (conditional inclusion)" % name)
                for (r, c, h) in compiled:
                    if c.search(line):
                        if not set(h).issubset(set(seen)):
                            requires.append((h, r))
                            seen += h
            self.depends_on[sourcefile] = includes
            self.requires[sourcefile] = requires
            # Duplicate-header detection
            trimmedcount = {}
            for ref in map(trim, includes):
                trimmedcount[ref] = trimmedcount.get(ref, 0) + 1
            for ref in trimmedcount:
                if trimmedcount[ref] > 1:
                    print("deheader: %s has more than one inclusion of %s" % (sourcefile, ref))
    def forget(self, sourcefile, header):
        "Forget a header dependency."
        self.depends_on[sourcefile].remove(header)
    def remember(self, sourcefile, header):
        "Undo forgetting of a dependency."
        self.depends_on[sourcefile].append(header)

class SaveForModification:
    "Prepare a file to be temporarily modified, with guaranteed reversion."
    def __init__(self, filename):
        self.filename = filename
        self.original = filename + "-orig"
        os.rename(self.filename, self.original)
    def remove_headers(self, removables):
        "Prepare a version with specified headers deleted."
        ofp = open(self.filename, "w")
        for line in open(self.original):
            if line not in removables:
                ofp.write(line)
        ofp.close()
    def forget(self):
        "Disable reversion."
        os.remove(self.original)
    def revert(self):
        "Revert modifications on the file at the end of this object's lifetime."
        if os.path.exists(self.original):
            try:
                os.remove(self.filename)
            except OSError:
                pass
            os.rename(self.original, self.filename)

def match_preproc(directives, line):
    if not isinstance(directives, list):
        directives = [directives]
    regexp = "|".join([r"#\s*" + d for d in directives])
    m = re.match(regexp, line)
    if m:
        return line[m.span()[1]:].strip()
    return False

def trim(line):
    "Get file reference from an #include, retaining <> if a system header."
    trimmed = re.sub(r"^#\s*include", "", line).strip()
    if trimmed[0] in '"':
        return '"' + trimmed.split('"')[1] + '"'
    elif trimmed[0] == '<':
        return trimmed.split('>')[0] + ">"
    else:
        return repr(line)

def testcompile(source, maker, msg="", verbosity=0, showerrs=False, subdir=""):
    "Test-compile a sourcefile.  Return the status and the compilation time"
    (stem, _suffix) = os.path.splitext(source)
    tmpname = stem + ".o"
    command = "{0} -o {1} {2}".format(maker, tmpname, source)
    olddir = os.getcwd()
    if len(subdir) > 0:
        os.chdir(subdir)
    start = time.time()
    (status, output) = getstatusoutput(command)
    end = time.time()
    os.chdir(olddir)
    if verbosity >= COMMAND_DEBUG or (showerrs and os.WIFEXITED(status) and os.WEXITSTATUS(status) != 0):
        sys.stdout.write(output + "\n")
    if status:
        explain = "failed"
        if verbosity >= PROGRESS_DEBUG:
            explain += " (%d)" % status
    else:
        explain = "succeeded"
    if verbosity >= PROGRESS_DEBUG:
        print("deheader: %s%s %s." % (source, msg, explain))
    return (status, end - start)

def c_analyze(sourcefile, maker, includes, requires, verbosity, subdir=""):
    "Given a C file and a list of includes, return those that can be omitted."
    # We'll remove headers in reverse order, because later unnecessary
    # headers might depend on earlier ones
    includes.reverse()
    unneeded = []
    if verbosity == BATON_DEBUG:
        baton = Baton(sourcefile + ": ", "Done")
    try:
        saveit = SaveForModification(os.path.join(subdir, sourcefile))
        while True:
            keepgoing = False
            for header in includes[:]:
                if verbosity == BATON_DEBUG:
                    baton.twirl()
                retain = 0
                for (requirements, trigger) in requires:
                    for required in requirements:
                        if required in header:
                            if verbosity >= PROGRESS_DEBUG:
                                print("deheader: in %s, %s prevents uninclusion of %s" % (os.path.join(subdir, sourcefile), trigger, trim(header)))
                            retain += 1
                if not retain:
                    saveit.remove_headers(unneeded + [header])
                    (st, _t) = testcompile(sourcefile, maker, " without %s" % trim(header), verbosity, showerrs=False, subdir=subdir)
                    if st == 0:
                        unneeded.append(header)
                        includes.remove(header)
                        keepgoing = True
            if not keepgoing:
                break
    finally:
        saveit.revert()
        if verbosity == BATON_DEBUG:
            baton.end()
    # Missing-require detection.  Can't be merged with duplicate-header
    # detection because this has to be done after unneeded headers are removed.
    stillhere = list(map(trim, includes))
    for (requirement, trigger) in requires:
        if not set(requirement).issubset(stillhere):
            print("deheader: in %s, %s portability requires %s." % (os.path.join(subdir, sourcefile), trigger, ",".join(requirement)))
    return unneeded

def deheader(sourcefile, maker, includes, requires, remove, verbose):
    # Sanity check against broken sourcefiles; we want this to
    # complain visibly if the sourcefile won't build at all.
    subdir = ""
    (st, _t) = testcompile(sourcefile, maker, verbosity=max(1, verbose), showerrs=False)
    if st != 0:
        subdir = os.path.dirname(sourcefile)
        sourcefile = os.path.basename(sourcefile)
        (st, _t) = testcompile(sourcefile, maker, verbosity=max(1, verbose), showerrs=True, subdir=subdir)
    if st == 0:
        # Now do the analysis
        if sourcefile.endswith(".c") or sourcefile.endswith(".cpp") or sourcefile.endswith(".cc") or sourcefile.endswith(".h"):
            unneeded = c_analyze(sourcefile, maker,
                                 includes[:], requires, verbose, subdir=subdir)
        if unneeded:
            for line in unneeded:
                print("deheader: remove %s from %s" % (trim(line), os.path.join(subdir, sourcefile)))
            if remove:
                remove_it = SaveForModification(os.path.join(subdir, sourcefile))
                remove_it.remove_headers(unneeded)
                remove_it.forget()
                del remove_it
        return Summary([sourcefile], includes, unneeded)
    else:
        sys.stderr.write("deheader: basic compilation failed on %s\n" % (sourcefile,))
        return Summary([sourcefile], includes, [])

# After-action analysis starts here

class Summary:
    "Summarize results from a deheading."
    def __init__(self, filenames=None, includes=None, unneeded=None):
        self.filenames = filenames or []
        self.includes = includes or []
        self.unneeded = unneeded or []
    def __add__(self, other):
        result = Summary()
        result.filenames = self.filenames + other.filenames
        result.includes = self.includes + other.includes
        result.unneeded = self.unneeded + other.unneeded
        return result
    def __repr__(self):
        return "%d files, %d includes, %d removable" % \
               (len(self.filenames), len(self.includes), len(self.unneeded))

if __name__ == "__main__":
    (options, arguments) = getopt.getopt(sys.argv[1:], "hi:m:qrvx:V",
                                         ["help", "ignore",
                                          "maker", "quiet",
                                          "remove", "verbose",
                                          "exclude", "version"])
    maker = "make"
    verbose = 0
    quiet = False
    remove = False
    ignores = []
    exclusions = []
    for (switch, val) in options:
        if switch in ('-h', '--help'):
            sys.stderr.write(__doc__)
            sys.exit(0)
        elif switch in ('-i', '--ignore'):
            ignores.append(val)
        elif switch in ('-m', '--maker'):
            maker = val
        elif switch in ('-q', '--quiet'):
            quiet = True
        elif switch in ('-r', '--remove'):
            remove = True
        elif switch in ('-v', '--verbose'):
            verbose += 1
        elif switch in ('-V', '--version'):
            print("deheader", version)
            raise SystemExit(0)
        elif switch in ('-x', '--exclude'):
            exclusions.append(val)
    if not ignores:
        ignore = None
    else:
        ignore = re.compile("|".join(ignores))
    if not exclusions:
        exclusions = None
    else:
        exclusions = re.compile("|".join(exclusions))
    if not arguments:
        arguments = ["."]

    inclusion_map = InclusionMap(arguments, ignore, exclusions, verbose)
    summaries = []
    for sourcefile in sorted(inclusion_map.depends_on.keys()):
        summaries.append(deheader(sourcefile, maker,
                                  inclusion_map.depends_on[sourcefile],
                                  inclusion_map.requires[sourcefile],
                                  remove, verbose))
    if not quiet:
        stats = Summary()
        for summary in summaries:
            stats = stats + summary
        print("deheader: saw %s" % stats)
    raise SystemExit(0)

# End