From 20bc94a2b8449b7700b6bfa25a87ce2320a1c649 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini <pbonzini@redhat.com> Date: Fri, 20 Oct 2017 12:11:32 +0200 Subject: build: disable -Wmissing-braces on older compilers GCC 4.9 and newer stopped warning for missing braces around the "universal" C zero initializer {0}. One such initializer sneaked into scsi/qemu-pr-helper.c and is breaking the build with such older GCC versions. Detect the lack of support for the idiom, and disable the warning in that case. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> --- configure | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'configure') diff --git a/configure b/configure index 285d123dbf..e31d6a7fee 100755 --- a/configure +++ b/configure @@ -1669,6 +1669,19 @@ EOF fi fi +# Disable -Wmissing-braces on older compilers that warn even for +# the "universal" C zero initializer {0}. +cat > $TMPC << EOF +struct { + int a[2]; +} x = {0}; +EOF +if compile_object "-Werror" "" ; then + : +else + QEMU_CFLAGS="$QEMU_CFLAGS -Wno-missing-braces" +fi + # Workaround for http://gcc.gnu.org/PR55489. Happens with -fPIE/-fPIC and # large functions that use global variables. The bug is in all releases of # GCC, but it became particularly acute in 4.6.x and 4.7.x. It is fixed in -- cgit v1.2.3