build: if -fstack-protector-strong is available, use it.

diff --git a/configure.ac b/configure.ac
index 50741149a965721d1999419d60d36a37d47dd6a1..d40fb383602d63e1b00a759d26443bfca0502698 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -156,6 +156,7 @@ CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
         -ffunction-sections \
         -fdata-sections \
         -fstack-protector \
+        -fstack-protector-strong \
         --param=ssp-buffer-size=4])
 AS_CASE([$CFLAGS], [*-O[[12345\ ]]*],
         [CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\