[PATCH 3/5] riscv: compat_vdso: Introduce COMPAT_MARCH variable

[Nam Cao]

The -march option is inside COMPAT_CC_FLAGS, making it difficult to extend.

Introduce COMPAT_MARCH variable to allow extension. A follow-up commit
will take advantage of this to add _zacas to -march.

Signed-off-by: Nam Cao <namcao at linutronix.de>
---
 arch/riscv/kernel/compat_vdso/Makefile | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/kernel/compat_vdso/Makefile b/arch/riscv/kernel/compat_vdso/Makefile
index 9520569ee079..06d28a5a0368 100644
--- a/arch/riscv/kernel/compat_vdso/Makefile
+++ b/arch/riscv/kernel/compat_vdso/Makefile
@@ -14,10 +14,13 @@ COMPAT_LD := $(LD)
 # binutils 2.35 does not support the zifencei extension, but in the ISA
 # spec 20191213, G stands for IMAFD_ZICSR_ZIFENCEI.
 ifdef CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
-	COMPAT_CC_FLAGS := -march=rv32g -mabi=ilp32
+	COMPAT_MARCH := rv32g
 else
-	COMPAT_CC_FLAGS := -march=rv32imafd -mabi=ilp32
+	COMPAT_MARCH := rv32imafd
 endif
+
+COMPAT_CC_FLAGS := -march=$(COMPAT_MARCH) -mabi=ilp32
+
 COMPAT_LD_FLAGS := -melf32lriscv
 
 # Disable attributes, as they're useless and break the build.
-- 
2.47.3