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| author | Alex Vatchenko <alex@fabulatech.com> | 2009-05-28 15:58:50 -0400 |
|---|---|---|
| committer | Daniel Drake <dsd@gentoo.org> | 2009-05-28 16:06:24 -0400 |
| commit | b501795985a23109f176d296e7b544b4c6354528 (patch) | |
| tree | eb141c0bdae20ea212dd19aacad88498a598820f /configure.ac | |
| parent | 00bb2805e994887f0a754a825c3ce03d22393386 (diff) | |
| download | libusb-b501795985a23109f176d296e7b544b4c6354528.tar.gz | |
pre-gcc-3.4 compatibility
The -fvisibility and -Wno-pointer-sign options are not available on
old GCC versions.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index dad73de..2617a16 100644 --- a/configure.ac +++ b/configure.ac @@ -71,9 +71,27 @@ CFLAGS="$CFLAGS -fgnu89-inline" AC_COMPILE_IFELSE(AC_LANG_PROGRAM([]), inline_cflags="-fgnu89-inline", inline_cflags="") CFLAGS="$saved_cflags" -AC_DEFINE([API_EXPORTED], [__attribute__((visibility("default")))], [Default visibility]) -AM_CFLAGS="-std=gnu99 $inline_cflags -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration -Wno-pointer-sign -Wshadow" +# check for -fvisibility=hidden compiler support (GCC >= 3.4) +saved_cflags="$CFLAGS" +CFLAGS="$CFLAGS -fvisibility=hidden" +AC_COMPILE_IFELSE(AC_LANG_PROGRAM([]), + [VISIBILITY_CFLAGS="-fvisibility=hidden" + AC_DEFINE([API_EXPORTED], [__attribute__((visibility("default")))], [Default visibility]) ], + [ VISIBILITY_CFLAGS="" + AC_DEFINE([API_EXPORTED], [], [Default visibility]) ], + ]) +CFLAGS="$saved_cflags" + +# check for -Wno-pointer-sign compiler support (GCC >= 4) +saved_cflags="$CFLAGS" +CFLAGS="$CFLAGS -Wno-pointer-sign" +AC_COMPILE_IFELSE(AC_LANG_PROGRAM([]), + nopointersign_cflags="-Wno-pointer-sign", nopointersign_cflags="") +CFLAGS="$saved_cflags" + +AM_CFLAGS="-std=gnu99 $inline_cflags -Wall -Wundef -Wunused -Wstrict-prototypes -Werror-implicit-function-declaration $nopointersign_cflags -Wshadow" +AC_SUBST(VISIBILITY_CFLAGS) AC_SUBST(AM_CFLAGS) AC_SUBST(AM_LDFLAGS) |