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| author | Max Kellermann <max@duempel.org> | 2008-10-16 14:59:26 +0200 |
|---|---|---|
| committer | Max Kellermann <max@duempel.org> | 2008-10-16 14:59:26 +0200 |
| commit | 9b5ce27c3b517c501bb13a534d50476e11751262 (patch) | |
| tree | 37e4b09727c53c8b4db69e1816814b6f5ca97a7b /m4/ucred.m4 | |
| parent | 3b20fa4f3f46d27d0d710d542ad75751f4c38fef (diff) | |
| download | mpd-9b5ce27c3b517c501bb13a534d50476e11751262.tar.gz mpd-9b5ce27c3b517c501bb13a534d50476e11751262.tar.xz mpd-9b5ce27c3b517c501bb13a534d50476e11751262.zip | |
configure.ac: check if "struct ucred" is available
By default, glibc 2.8 hides struct ucred behind the _GNU_SOURCE
macro. I don't want to enable that globally, because it may encourage
the use of non-portable functions. Test if "struct ucred" is
available, and enable _GNU_SOURCE if required.
For details about that issue, see glib's bug database:
http://sources.redhat.com/bugzilla/show_bug.cgi?id=6545
Diffstat (limited to 'm4/ucred.m4')
| -rw-r--r-- | m4/ucred.m4 | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/m4/ucred.m4 b/m4/ucred.m4 new file mode 100644 index 000000000..3a8245245 --- /dev/null +++ b/m4/ucred.m4 @@ -0,0 +1,32 @@ +# Check if "struct ucred" is available. If not, try harder with +# _GNU_SOURCE. +# +# Author: Max Kellermann <max@duempel.org> + +AC_DEFUN([STRUCT_UCRED],[ + AC_MSG_CHECKING([for struct ucred]) + AC_CACHE_VAL(mpd_cv_have_struct_ucred, [ + AC_TRY_COMPILE([#include <sys/socket.h>], + [struct ucred cred;], + mpd_cv_have_struct_ucred=yes, + mpd_cv_have_struct_ucred=no) + if test x$mpd_cv_have_struct_ucred = xno; then + # glibc 2.8 forces _GNU_SOURCE on us + AC_TRY_COMPILE( + [#define _GNU_SOURCE + #include <sys/socket.h>], + [struct ucred cred;], + mpd_cv_have_struct_ucred=yes, + mpd_cv_have_struct_ucred=no) + if test x$mpd_cv_have_struct_ucred = xyes; then + # :( + MPD_CFLAGS="$MPD_CFLAGS -D_GNU_SOURCE" + fi + fi + ]) + + AC_MSG_RESULT($mpd_cv_have_struct_ucred) + if test x$mpd_cv_have_struct_ucred = xyes; then + AC_DEFINE(HAVE_STRUCT_UCRED, 1, [Define if struct ucred is present from sys/socket.h]) + fi +]) |