[build] Use -maccumulate-outgoing-args if required by gcc
Current versions of gcc require -maccumulate-outgoing-args if any sysv_abi functions call ms_abi functions. This requirement is likely to be lifted in future gcc versions, so test explicitly to see if the current version of gcc requires -maccumulate-outgoing-args. This problem is currently masked since the implied -fasynchronous-unwind-tables (which is the default in current gcc versions) implies -maccumulate-outgoing-args. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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@ -26,6 +26,18 @@ CFLAGS += -fshort-wchar
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#
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CFLAGS += -Ui386
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# Add -maccumulate-outgoing-args if required by this version of gcc
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#
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ifeq ($(CCTYPE),gcc)
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MS_ABI_TEST_CODE := extern void __attribute__ (( ms_abi )) ms_abi(); \
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void sysv_abi ( void ) { ms_abi(); }
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MS_ABI_TEST = $(ECHO) '$(MS_ABI_TEST_CODE)' | \
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$(CC) -m64 -mno-accumulate-outgoing-args -x c -c - -o /dev/null \
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>/dev/null 2>&1
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MS_ABI_FLAGS := $(shell $(MS_ABI_TEST) || $(ECHO) '-maccumulate-outgoing-args')
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WORKAROUND_CFLAGS += $(MS_ABI_FLAGS)
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endif
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# x86_64-specific directories containing source files
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#
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SRCDIRS += arch/x86_64/prefix
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