[Minios-devel] [UNIKRAFT PATCHv5 09/46] arch/arm: Check gcc version and set processor flags for arm32

[Wei Chen <wei.chen@xxxxxxx>]

From: Wei Chen <Wei.Chen@xxxxxxx>

Similar to ARM64, the optimization processor flags have the minimum
gcc version requirement. So we still need to check the GCC version
for arm32. As we have already defined a makefile function to do such
task, so we can use this function for arm32 too.

Signed-off-by: Wei Chen <Wei.Chen@xxxxxxx>
---
 arch/arm/arm/Makefile.uk | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/arch/arm/arm/Makefile.uk b/arch/arm/arm/Makefile.uk
index a84f2b8..38ea876 100644
--- a/arch/arm/arm/Makefile.uk
+++ b/arch/arm/arm/Makefile.uk
@@ -5,12 +5,19 @@ CFLAGS   += -marm -fms-extensions
 CXXFLAGS += -D__ARM_32__
 CXXFLAGS += -marm -fms-extensions
 
-#-march=armv7-a
+# Set GCC flags for MARCH_ARM32_A20NEON. GCC supports -mcpu=cortex-a7 from 4.7
+ifeq ($(CONFIG_MARCH_ARM32_A20NEON),y)
+$(call error_if_gcc_version_lt,4,7)
+CFLAGS-$(call gcc_version_ge,4,7)      += -mcpu=cortex-a7 -mtune=cortex-a7 
-mfpu=vfpv4-d16 -mfpu=neon-vfpv4 -funsafe-math-optimizations
+CXXFLAGS-$(call gcc_version_ge,4,7)    += -mcpu=cortex-a7 -mtune=cortex-a7 
-mfpu=vfpv4-d16 -mfpu=neon-vfpv4 -funsafe-math-optimizations
+endif
 
-CFLAGS-$(CONFIG_MARCH_ARM32_A20NEON)    += -mcpu=cortex-a7 -mtune=cortex-a7 
-mfpu=vfpv4-d16 -mfpu=neon-vfpv4 -funsafe-math-optimizations
-CXXFLAGS-$(CONFIG_MARCH_ARM32_A20NEON)  += -mcpu=cortex-a7 -mtune=cortex-a7 
-mfpu=vfpv4-d16 -mfpu=neon-vfpv4 -funsafe-math-optimizations
-CFLAGS-$(CONFIG_MARCH_ARM32_CORTEXA7)   += -mcpu=cortex-a7 -mtune=cortex-a7
-CXXFLAGS-$(CONFIG_MARCH_ARM32_CORTEXA7) += -mcpu=cortex-a7 -mtune=cortex-a
+# Set GCC flags for MARCH_ARM32_CORTEXA7. GCC supports -mcpu=cortex-a7 from 4.7
+ifeq ($(CONFIG_MARCH_ARM32_CORTEXA7),y)
+$(call error_if_gcc_version_lt,4,7)
+CFLAGS-$(call gcc_version_ge,4,7)      += -mcpu=cortex-a7 -mtune=cortex-a7
+CXXFLAGS-$(call gcc_version_ge,4,7)    += -mcpu=cortex-a7 -mtune=cortex-a7
+endif
 
 $(eval $(call addlib,libarmmath))
 LIBARMMATH_SRCS-$(CONFIG_ARCH_ARM_32) += $(CONFIG_UK_BASE)/arch/arm/divsi3.S
-- 
2.17.1


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