diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/configure.in b/configure.in index bf3c97374..afc35ee3a 100644 --- a/configure.in +++ b/configure.in @@ -339,6 +339,108 @@ AC_COMPILE_IFELSE( ) +AC_MSG_CHECKING([whether $CC supports -fPIC]) +OLD_CFLAGS="$CFLAGS" +CFLAGS="$CFLAGS -fPIC" +AC_COMPILE_IFELSE( + [int foo;], + [ + AC_MSG_RESULT([yes]) + compiler_supports_pic="yes" + ], + [ + AC_MSG_RESULT([no]) + compiler_supports_pic="no" + ] +) +CFLAGS="$OLD_CFLAGS" + + +# +# -shared needs position independent code; some platforms emit it +# always, others need -fPIC +# +AC_MSG_CHECKING([whether $CC needs -fPIC for shared objects]) +OLD_CFLAGS="$CFLAGS" +CFLAGS="$CFLAGS -shared" +WITH_PLUGINS="yes" +AC_LINK_IFELSE( + [ + int foo(void) + { + return 0; + } + ], + [ + AC_MSG_RESULT([no]) + CFLAGS="$OLD_CFLAGS" + ], + [ + if test "$compiler_supports_pic" = "yes" ; then + # Verify if -shared really fails due to lack of -fPIC or something else + CFLAGS="$CFLAGS -fPIC" + AC_LINK_IFELSE( + [ + int foo(void) + { + return 0; + } + ], + [ + AC_MSG_RESULT([yes]) + CFLAGS="$OLD_CFLAGS -fPIC" + ], + [ + AC_MSG_RESULT([no, but fails for another reason]) + AC_MSG_ERROR([compiler is unable to compile shared objects for an unhandled reason, please report this with attached config.log... stopping]) + ] + ) + else + # Disable compilation of plugins (optional), so 'make all' does not fail + AC_MSG_RESULT([yes, but unsupported]) + AC_MSG_NOTICE([compiler is unable to generate position independent code, disabled plugins (optional)]) + WITH_PLUGINS="no" + fi + ] +) +AC_SUBST([WITH_PLUGINS]) + + +# +# DB_MANUAL_CAST_TO_UNION +# +AC_MSG_CHECKING([whether $CC is able to typecast to union]) +AC_COMPILE_IFELSE( + [ + typedef union Foonion + { + int i; + unsigned int ui; + const char* s; + } + Foonion; + + int bar(Foonion onion) + { + return onion.i; + } + + int foo(void) + { + int i = 0; + + return bar(((Foonion)(int)i)); + } + ], + [ + AC_MSG_RESULT([yes]) + ], + [ + AC_MSG_RESULT([no]) + CFLAGS="$CFLAGS -DDB_MANUAL_CAST_TO_UNION" + ] +) + ############################################################################### # Check for libraries and header files. @@ -351,6 +453,11 @@ AC_COMPILE_IFELSE( AC_CHECK_FUNC([setrlimit],[CFLAGS="$CFLAGS -DHAVE_SETRLIMIT"]) +# +# strnlen - string length with upper scan bound +# +AC_CHECK_FUNC([strnlen],[CFLAGS="$CFLAGS -DHAVE_STRNLEN"]) + # # Memory manager |