[PATCH 1/3] Makefile: Conditionally add -mno-omit-leaf-frame-pointer

[Wander Lairson Costa <wander@redhat.com>]

The -mno-omit-leaf-frame-pointer option is not available on all
architectures (e.g., s390x) or with older compiler versions. To avoid
compilation errors on such systems, this change adds a check to ensure
the option is only used when the compiler supports it.

This approach is similar to the existing check for -fcf-protection.

Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Cc: Derek Barbosa <debarbos@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Chunsheng Luo <luochunsheng@ustc.edu>
---
 Makefile | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index c19e0bd..d605e60 100644
--- a/Makefile
+++ b/Makefile
@@ -60,7 +60,13 @@ FOPTS	:=	-flto=auto -ffat-lto-objects -fexceptions -fstack-protector-strong \
 		-fasynchronous-unwind-tables -fstack-clash-protection -fno-omit-frame-pointer \
 		$(strip $(FCF_PROTECTION)) -fpie
 
-MOPTS   :=  	$(strip $(MTUNE)) $(strip $(M64)) -mno-omit-leaf-frame-pointer
+# Test if compiler supports -mno-omit-leaf-frame-pointer
+OMIT_LEAF_FP := $(shell echo 'int main(void){return 0;}' | \
+		$(CC) -x c -mno-omit-leaf-frame-pointer - \
+		-o /dev/null 2>/dev/null && \
+		echo '-mno-omit-leaf-frame-pointer')
+
+MOPTS   :=  	$(strip $(MTUNE)) $(strip $(M64)) $(strip $(OMIT_LEAF_FP))
 
 WOPTS	:= 	-Wall -Werror=format-security
 
-- 
2.51.1