build-sys: fix -fsanitize=address check
Since 218bb57dd79d6843e0592c30a82ea8c1fddc74a5, the -fsanitize=address
check fails with:
config-temp/qemu-conf.c:3:20: error: integer overflow in expression [-Werror=overflow]
return INT32_MIN / -1;
Interestingly, UBSAN check doesn't produce a compile time warning.
Use a test that doesn't have compile time warnings, and make it
specific to UBSAN check.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20180215212552.26997-2-marcandre.lureau@redhat.com>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/configure b/configure
index 27d3f66..7ff00f8 100755
--- a/configure
+++ b/configure
@@ -5316,25 +5316,27 @@
##########################################
# checks for sanitizers
-# we could use a simple skeleton for flags checks, but this also
-# detect the static linking issue of ubsan, see also:
-# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84285
-cat > $TMPC << EOF
-#include <stdint.h>
-int main(void) {
- return INT32_MIN / -1;
-}
-EOF
-
have_asan=no
have_ubsan=no
have_asan_iface_h=no
have_asan_iface_fiber=no
if test "$sanitizers" = "yes" ; then
+ write_c_skeleton
if compile_prog "$CPU_CFLAGS -Werror -fsanitize=address" ""; then
have_asan=yes
fi
+
+ # we could use a simple skeleton for flags checks, but this also
+ # detect the static linking issue of ubsan, see also:
+ # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84285
+ cat > $TMPC << EOF
+#include <stdlib.h>
+int main(void) {
+ void *tmp = malloc(10);
+ return *(int *)(tmp + 2);
+}
+EOF
if compile_prog "$CPU_CFLAGS -Werror -fsanitize=undefined" ""; then
have_ubsan=yes
fi
