The glib headers use GCC attributes. Unfortunately the __GNUC__ and __GNUC_MINOR__ version macros are also defined by clang, but clang doesn't support the same attributes as GCC.
clang 3.5.0 does not support the __alloc_size__ attribute: https://github.com/llvm-mirror/clang/commit/c047507a9a79e89fc8339e074fa72822a7e7ea73 The following warning is produced: gstrfuncs.h:257:44: warning: unknown attribute '__alloc_size__' ignored [-Wunknown-attributes] G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(2); gmacros.h:67:45: note: expanded from macro 'G_GNUC_ALLOC_SIZE' #define G_GNUC_ALLOC_SIZE(x) __attribute__((__alloc_size__(x))) This patch checks whether glib headers cause warnings and disables -Wunknown-attributes if that is the case. Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com> --- configure | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/configure b/configure index 4f9f689..00740ad 100755 --- a/configure +++ b/configure @@ -2773,6 +2773,16 @@ if ! $pkg_config --atleast-version=2.38 glib-2.0; then glib_subprocess=no fi +# Silence clang 3.5.0 warnings about glib attribute __alloc_size__ usage +cat > $TMPC << EOF +#include <glib.h> +int main(void) { return 0; } +EOF +if ! compile_prog "-Werror" "" ; then + glib_cflags="-Wno-unknown-attributes $glib_cflags" + CFLAGS="-Wno-unknown-attributes $CFLAGS" +fi + ########################################## # SHA command probe for modules if test "$modules" = yes; then -- 2.1.0
