diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 315 |
1 files changed, 125 insertions, 190 deletions
diff --git a/configure.in b/configure.in index e8e2eba3f..94bad9ca4 100644 --- a/configure.in +++ b/configure.in @@ -248,22 +248,22 @@ AC_ARG_ENABLE( # LTO # AC_ARG_ENABLE( - [lto], - AC_HELP_STRING( - [--enable-lto], - [ + [lto], + AC_HELP_STRING( + [--enable-lto], + [ Enables or Disables Linktime Code Optimization (LTO is enabled by default) - ] - ), - [ - enable_lto="$enableval" - case $enableval in - "no");; - "yes");; - *) AC_MSG_ERROR([[invalid argument --enable-lto=$disableval... stopping]]);; - esac - ], - [enable_lto="yes"] + ] + ), + [ + enable_lto="$enableval" + case $enableval in + "no");; + "yes");; + *) AC_MSG_ERROR([[invalid argument --enable-lto=$disableval... stopping]]);; + esac + ], + [enable_lto="yes"] ) @@ -517,19 +517,6 @@ AC_RUN_IFELSE( ) -AC_MSG_CHECKING([whether $CC supports -Wno-unused-parameter]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wno-unused-parameter" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], - [AC_MSG_RESULT([yes])], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" - ] -) - - # # LTO Support test # @@ -545,8 +532,8 @@ if test "$enable_lto" != "no" ; then AC_RUN_IFELSE( [AC_LANG_SOURCE([ int main(int argc, char **argv){ - return 0; - } + return 0; + } ])], [ AC_MSG_RESULT([yes]) @@ -563,193 +550,141 @@ if test "$enable_lto" != "no" ; then fi -AC_MSG_CHECKING([whether $CC supports -Wno-maybe-uninitialized]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wno-maybe-uninitialized" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], +AC_DEFUN(AC_CHECK_COMPILER_WFLAG, [ - AC_MSG_RESULT([yes]) - AC_MSG_CHECKING([whether $CC can actually use -Wno-maybe-uninitialized]) - # Note: -Werror must be before -Wno-maybe-uninitialized, otherwise it does not do anything - CFLAGS="$OLD_CFLAGS -Werror -Wno-maybe-uninitialized" + AC_MSG_CHECKING([whether $CC supports -W$1]) + OLD_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -Werror -W$1" AC_COMPILE_IFELSE( [AC_LANG_SOURCE([int foo;])], [ AC_MSG_RESULT([yes]) - CFLAGS="$OLD_CFLAGS -Wno-maybe-uninitialized" + CFLAGS="$OLD_CFLAGS -W$1" + # Optionally, run a test + if test "x$2" != "x"; then + AC_MSG_CHECKING([whether $CC can actually use -W$1]) + CFLAGS="$OLD_CFLAGS -Werror -W$1" + AC_COMPILE_IFELSE( + [AC_LANG_SOURCE([$2])], + [ + AC_MSG_RESULT([no]) + CFLAGS="$OLD_CFLAGS" + ] + [ + AC_MSG_RESULT([yes]) + CFLAGS="$OLD_CFLAGS -W$1" + ], + ) + fi ], [ AC_MSG_RESULT([no]) CFLAGS="$OLD_CFLAGS" ] ) - ], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" ] ) - -AC_MSG_CHECKING([whether $CC supports -Wno-clobbered]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wno-clobbered" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], +AC_DEFUN(AC_CHECK_COMPILER_WNOFLAG, [ - AC_MSG_RESULT([yes]) - AC_MSG_CHECKING([whether $CC can actually use -Wno-clobbered]) - # Note: -Werror must be before -Wno-clobbered, otherwise it does not do anything - CFLAGS="$OLD_CFLAGS -Werror -Wno-clobbered" + AC_MSG_CHECKING([whether $CC supports -Wno-$1]) + OLD_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -Werror -Wno-$1" AC_COMPILE_IFELSE( [AC_LANG_SOURCE([int foo;])], [ - AC_MSG_RESULT([yes]) - CFLAGS="$OLD_CFLAGS -Wno-clobbered" + # Recent versions of gcc don't fail if -Wno-foo is not recognized + # (unless there are also other warnings), so we also check for -Wfoo + # which always fails if not supported + CFLAGS="$OLD_CFLAGS -Werror -W$1" + AC_COMPILE_IFELSE( + [AC_LANG_SOURCE([int foo;])], + [ + AC_MSG_RESULT([yes]) + CFLAGS="$OLD_CFLAGS -Wno-$1" + # Optionally, run a test + if test "x$2" != "x"; then + AC_MSG_CHECKING([whether $CC can actually use -Wno-$1]) + CFLAGS="$OLD_CFLAGS -Werror -W$1" + AC_COMPILE_IFELSE( + [AC_LANG_SOURCE([$2])], + [ + AC_MSG_RESULT([not needed but enabled]) + CFLAGS="$OLD_CFLAGS" + ], + [ + CFLAGS="$OLD_CFLAGS -Werror -Wno-$1" + AC_COMPILE_IFELSE( + [AC_LANG_SOURCE([$2])], + [ + AC_MSG_RESULT([yes]) + CFLAGS="$OLD_CFLAGS -Wno-$1" + ], + [ + AC_MSG_RESULT([no]) + CFLAGS="$OLD_CFLAGS" + ] + ) + ] + ) + fi + ], + [ + AC_MSG_RESULT([no]) + CFLAGS="$OLD_CFLAGS" + ] + ) ], [ AC_MSG_RESULT([no]) CFLAGS="$OLD_CFLAGS" ] ) - ], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" - ] -) - - -AC_MSG_CHECKING([whether $CC supports -Wempty-body]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wempty-body" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], - [AC_MSG_RESULT([yes])], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" - ] -) - - -AC_MSG_CHECKING([whether $CC supports -Wnewline-eof]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wnewline-eof" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], - [AC_MSG_RESULT([yes])], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" - ] -) - - -AC_MSG_CHECKING([whether $CC supports -Wshadow]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wshadow" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], - [AC_MSG_RESULT([yes])], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" - ] -) - - -AC_MSG_CHECKING([whether $CC supports -Wint-conversion]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wenum-conversion" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], - [AC_MSG_RESULT([yes])], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" - ] -) - - -AC_MSG_CHECKING([whether $CC supports -Wenum-conversion]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wenum-conversion" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], - [AC_MSG_RESULT([yes])], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" - ] -) - - -AC_MSG_CHECKING([whether $CC supports -Wshorten-64-to-32]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wshorten-64-to-32" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], - [AC_MSG_RESULT([yes])], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" - ] -) - - -AC_MSG_CHECKING([whether $CC supports -Wconstant-conversion]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wconstant-conversion" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], - [AC_MSG_RESULT([yes])], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" - ] -) - - -AC_MSG_CHECKING([whether $CC supports -Wbool-conversion]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wbool-conversion" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], - [AC_MSG_RESULT([yes])], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" - ] -) - - -AC_MSG_CHECKING([whether $CC supports -Wno-switch]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wno-switch" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], - [AC_MSG_RESULT([yes])], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" - ] -) - - -AC_MSG_CHECKING([whether $CC supports -Wno-missing-field-initializers]) -OLD_CFLAGS="$CFLAGS" -CFLAGS="$CFLAGS -Wno-missing-field-initializers" -AC_COMPILE_IFELSE( - [AC_LANG_SOURCE([int foo;])], - [AC_MSG_RESULT([yes])], - [ - AC_MSG_RESULT([no]) - CFLAGS="$OLD_CFLAGS" ] ) +AC_CHECK_COMPILER_WNOFLAG(unused-parameter, [int foo(int bar) { return 0; }]) +AC_CHECK_COMPILER_WNOFLAG(maybe-uninitialized) +AC_CHECK_COMPILER_WNOFLAG(clobbered) +AC_CHECK_COMPILER_WFLAG(empty-body) +AC_CHECK_COMPILER_WFLAG(newline-eof) +AC_CHECK_COMPILER_WFLAG(int-conversion) +AC_CHECK_COMPILER_WFLAG(enum-conversion) +AC_CHECK_COMPILER_WFLAG(shorten-64-to-32) +AC_CHECK_COMPILER_WFLAG(constant-conversion) +AC_CHECK_COMPILER_WFLAG(bool-conversion) +AC_CHECK_COMPILER_WNOFLAG(switch) +AC_CHECK_COMPILER_WNOFLAG(missing-field-initializers) + +# Certain versions of gcc make -Wshadow completely useless by making it flood +# you with unnecessary warnings <https://lkml.org/lkml/2006/11/28/239> +# Let's check if we can really use it +SAVED_OLD_CFLAGS="$CFLAGS" +AC_CHECK_COMPILER_WFLAG(shadow) +if test "x$CFLAGS" != "x$SAVED_OLD_CFLAGS"; then + AC_MSG_CHECKING([whether $CC can efficiently use -Wshadow]) + NEW_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -Werror -Wshadow" + AC_COMPILE_IFELSE( + [AC_LANG_SOURCE([ + int foo(void) { + return 0; + } + int bar(void) { + int foo = 0; + return foo + 1; + } + ])], + [ + AC_MSG_RESULT([yes]) + CFLAGS="$NEW_CFLAGS" + ], + [ + AC_MSG_RESULT([no]) + CFLAGS="$SAVED_OLD_CFLAGS" + ] + ) +fi AC_MSG_CHECKING([whether $CC supports -fPIC]) OLD_CFLAGS="$CFLAGS" |