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authorMax Kellermann <max@duempel.org>2008-10-16 14:59:26 +0200
committerMax Kellermann <max@duempel.org>2008-10-16 14:59:26 +0200
commit9b5ce27c3b517c501bb13a534d50476e11751262 (patch)
tree37e4b09727c53c8b4db69e1816814b6f5ca97a7b /m4
parent3b20fa4f3f46d27d0d710d542ad75751f4c38fef (diff)
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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')
-rw-r--r--m4/ucred.m432
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
+])