gcc supports -fstack-protector-strong since v4.9 only. Add a "poor man's
autoconf" test to check whether the option is supported on the given
build system.
Fixes: 596f51f3
"multipath-tools: Replace -fstack-protector with -fstack-protector-strong"
Signed-off-by: Martin Wilck <mwilck@xxxxxxxx>
---
Makefile.inc | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/Makefile.inc b/Makefile.inc
index 8361e6c4..de69ab38 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -69,10 +69,23 @@ RM = rm -f
LN = ln -sf
INSTALL_PROGRAM = install
+# $(call TEST_CC_OPTION,option,fallback)
+# Test if the C compiler supports the option.
+# Evaluates to "option" if yes, and "fallback" otherwise.
+TEST_CC_OPTION = $(shell \
+ if echo 'int main(void){return 0;}' | $(CC) -o /dev/null -c "$(1)" -xc - &>/dev/null; \
+ then \
+ echo "$(1)"; \
+ else \
+ echo "$(2)"; \
+ fi)
+
+STACKPROT := $(call TEST_CC_OPTION,-fstack-protector-strong,-fstack-protector)
+
OPTFLAGS = -O2 -g -pipe -Wall -Wextra -Wformat=2 -Werror=implicit-int \
-Werror=implicit-function-declaration -Werror=format-security \
-Wno-sign-compare -Wno-unused-parameter -Wno-clobbered \
- -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong \
+ -Wp,-D_FORTIFY_SOURCE=2 $(STACKPROT) \
--param=ssp-buffer-size=4
CFLAGS = $(OPTFLAGS) -fPIC -DLIB_STRING=\"${LIB}\" -DRUN_DIR=\"${RUN}\"
--
2.12.2
--
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