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Generate gcc-macros.h

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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>
This commit is contained in:
Florian Weimer 2022-01-14 16:09:20 +01:00
parent 5732a881aa
commit ef7c6d42fe
1 changed files with 9 additions and 0 deletions
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9
Makeconfig
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@ -1202,6 +1202,15 @@ $(common-objpfx)dl-tunable-list.stmp: \
touch $@
endif
# Dump the GCC macros used by the default compiler flags to a header
# file, so that they can be inspected when using different compiler
# flags. Add the GCCMACRO prefix to make these macro names unique.
$(common-objpfx)gcc-macros.h.in: $(common-objpfx)config.status
$(CC) $(CFLAGS) $(CPPFLAGS) -E -dM -x c -o $@ /dev/null
$(common-objpfx)gcc-macros.h: $(common-objpfx)gcc-macros.h.in
sed 's/^#define /#define GCCMACRO/' < $< > $@
before-compile += $(common-objpfx)gcc-macros.h
# Generate version maps, but wait until sysdep-subdirs is known
ifeq ($(sysd-sorted-done),t)
ifeq ($(build-shared),yes)