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Generate gcc-macros.h
The file can be used to check the effect of the default compiler flags on code generation even in areas of the build that uses non-default compiler flags. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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@ -1202,6 +1202,15 @@ $(common-objpfx)dl-tunable-list.stmp: \
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touch $@
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endif
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# Dump the GCC macros used by the default compiler flags to a header
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# file, so that they can be inspected when using different compiler
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# flags. Add the GCCMACRO prefix to make these macro names unique.
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$(common-objpfx)gcc-macros.h.in: $(common-objpfx)config.status
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$(CC) $(CFLAGS) $(CPPFLAGS) -E -dM -x c -o $@ /dev/null
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$(common-objpfx)gcc-macros.h: $(common-objpfx)gcc-macros.h.in
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sed 's/^#define /#define GCCMACRO/' < $< > $@
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before-compile += $(common-objpfx)gcc-macros.h
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# Generate version maps, but wait until sysdep-subdirs is known
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ifeq ($(sysd-sorted-done),t)
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ifeq ($(build-shared),yes)
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