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This flag is not supported by clang, which results in a warning: clang-14: warning: argument unused during compilation: '-mno-branch-likely' [-Wunused-command-line-argument] This breaks cc-option, which adds -Werror to make this warning fatal and catch flags that are not supported. Wrap this flag in cc-option so that it does not cause cc-option to fail, which can cause randconfigs to be really noisy, due to warnings not getting disabled that should be. Additionally, move the cc-option check to Kconfig so that the check is done at configuration time, rather than build time, as builds with no configuration change will be quicker because the cc-option call will not need to happen in those instances. Suggested-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
24 lines
653 B
Plaintext
24 lines
653 B
Plaintext
#
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# Loongson Processors' Support
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#
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cflags-$(CONFIG_CPU_LOONGSON64) += -Wa,--trap
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ifdef CONFIG_CPU_LOONGSON64
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cflags-$(CONFIG_CC_IS_GCC) += -march=loongson3a
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cflags-$(CONFIG_CC_IS_CLANG) += -march=mips64r2
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endif
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# Some -march= flags enable MMI instructions, and GCC complains about that
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# support being enabled alongside -msoft-float. Thus explicitly disable MMI.
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cflags-y += $(call cc-option,-mno-loongson-mmi)
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#
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# Loongson Machines' Support
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#
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cflags-$(CONFIG_MACH_LOONGSON64) += -I$(srctree)/arch/mips/include/asm/mach-loongson64
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cflags-$(CONFIG_CC_HAS_MNO_BRANCH_LIKELY) += -mno-branch-likely
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load-$(CONFIG_CPU_LOONGSON64) += 0xffffffff80200000
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