Makefile: Fix -msave-restore compile warning with CLANG-10 (or lower)

The riscv target of CLANG-10 (or lower) does not support the
-m(no-)save-restore option so we get compile warnings. This patch
fixes compile warning by using -m(no-)save-restore option only
for GCC.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Dong Du <Dd_nirvana@sjtu.edu.cn>

diff --git a/Makefile b/Makefile
index 8623c1c..d89a0c5 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -275,8 +275,11 @@ GENFLAGS   +=      $(platform-genflags-y)
 GENFLAGS       +=      $(firmware-genflags-y)
 
 CFLAGS         =       -g -Wall -Werror -ffreestanding -nostdlib -fno-stack-protector -fno-strict-aliasing -O2
-CFLAGS         +=      -fno-omit-frame-pointer -fno-optimize-sibling-calls
-CFLAGS         +=      -mno-save-restore -mstrict-align
+CFLAGS         +=      -fno-omit-frame-pointer -fno-optimize-sibling-calls -mstrict-align
+# CLANG-10 (or lower) does not support -m(no-)save-restore option
+ifneq ($(CC_IS_CLANG),y)
+CFLAGS         +=      -mno-save-restore
+endif
 CFLAGS         +=      -mabi=$(PLATFORM_RISCV_ABI) -march=$(PLATFORM_RISCV_ISA)
 CFLAGS         +=      -mcmodel=$(PLATFORM_RISCV_CODE_MODEL)
 CFLAGS         +=      $(RELAX_FLAG)
@@ -290,8 +293,11 @@ CPPFLAGS   +=      $(platform-cppflags-y)
 CPPFLAGS       +=      $(firmware-cppflags-y)
 
 ASFLAGS                =       -g -Wall -nostdlib
-ASFLAGS                +=      -fno-omit-frame-pointer -fno-optimize-sibling-calls
-ASFLAGS                +=      -mno-save-restore -mstrict-align
+ASFLAGS                +=      -fno-omit-frame-pointer -fno-optimize-sibling-calls -mstrict-align
+# CLANG-10 (or lower) does not support -m(no-)save-restore option
+ifneq ($(CC_IS_CLANG),y)
+ASFLAGS                +=      -mno-save-restore
+endif
 ASFLAGS                +=      -mabi=$(PLATFORM_RISCV_ABI) -march=$(PLATFORM_RISCV_ISA)
 ASFLAGS                +=      -mcmodel=$(PLATFORM_RISCV_CODE_MODEL)
 ASFLAGS                +=      $(RELAX_FLAG)