[PATCH 3/3] Makefile: don't grep when setting CC_SUPPORT_SAVE_RESTORE

[Trevor Gamblin]

Check exit status from the compiler/linker check directly (similar to
OPENSBI_LD_PIE), rather than using grep to search for a pattern. This
avoids potential unrelated matches in the command.

Signed-off-by: Trevor Gamblin <tgamblin at baylibre.com>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index a8ccfbab..ea05dfd1 100644
--- a/Makefile
+++ b/Makefile
@@ -198,7 +198,7 @@ OPENSBI_LD_PIE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) $(USE_LD_FLAG) -fP
 OPENSBI_LD_EXCLUDE_LIBS := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) $(USE_LD_FLAG) "-Wl,--exclude-libs,ALL" -x c /dev/null -o /dev/null >/dev/null 2>&1 && echo y || echo n)
 
 # Check whether the compiler supports -m(no-)save-restore
-CC_SUPPORT_SAVE_RESTORE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) -nostdlib -mno-save-restore -x c /dev/null -o /dev/null 2>&1 | grep -e "-save-restore" >/dev/null && echo n || echo y)
+CC_SUPPORT_SAVE_RESTORE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) -nostdlib -mno-save-restore -x c /dev/null -o /dev/null 2>&1 && echo y || echo n)
 
 # Check whether the compiler supports -m(no-)strict-align
 CC_SUPPORT_STRICT_ALIGN := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) -nostdlib -mstrict-align -x c /dev/null -o /dev/null 2>&1 && echo y || echo n)

-- 
2.55.0