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base-hw: Use softfp ABI on virt_qemu ARMv7.

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The soft ABI implies purely software floating point implementation.
This is not the case for Genode however. For example core's
exception_vector.S uses vmsr instruction. This builds fine with with
GCC based toolchain, but clang with integrated-as complains:

src/core/spec/arm/exception_vector.S:122:2: error: instruction requires: VFP2
 vmsr fpexc, r1
 ^

Fix this by passing softfp to mfloat-abi command on ARMv7. This allows
usage of FP HW, but implies soft-floating point ABI.

Issue #4421
This commit is contained in:
Piotr Tworek 2020-11-16 00:48:37 +01:00 committed by Norman Feske
parent 4ae78639f5
commit 5e93a5806b
1 changed files with 1 additions and 1 deletions
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repos/base-hw/lib/mk/spec/arm_v7/core-hw-virt_qemu.mk
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@ -16,6 +16,6 @@ SRC_S += spec/arm_v7/virtualization/exception_vector.s
NR_OF_CPUS = 2
CC_MARCH = -march=armv7ve -mtune=cortex-a15 -mfpu=vfpv3 -mfloat-abi=soft
CC_MARCH = -march=armv7ve -mtune=cortex-a15 -mfpu=vfpv3 -mfloat-abi=softfp
include $(call select_from_repositories,lib/mk/spec/cortex_a15/core-hw.inc)