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 <pbonz...@redhat.com>
---
Of course it's always possible to use "memset", but {0}
is neater in my opinion.
configure | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/configure b/configure
index 7766e74125..0b2d595c6e 100755
--- a/configure
+++ b/configure
@@ -1651,6 +1651,19 @@ 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
--
2.14.2
