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configure.ac: check if "struct ucred" is available

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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
This commit is contained in:
Max Kellermann
2008-10-16 14:59:26 +02:00
parent 3b20fa4f3f
commit 9b5ce27c3b
3 changed files with 35 additions and 2 deletions
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32
m4/ucred.m4 Normal file
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@@ -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
])