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33 lines
1.2 KiB
33 lines
1.2 KiB
2 years ago
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commit ef7c6d42fe163a5e49a478c43e655ce4633fa5ba
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Jan 14 16:09:20 2022 +0100
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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
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flags on code generation even in areas of the build that uses
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non-default compiler flags.
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Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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diff --git a/Makeconfig b/Makeconfig
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index 8bc5540292c7b6fa..99898a632a64be91 100644
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--- a/Makeconfig
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+++ b/Makeconfig
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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 += $(common-objpfx)gcc-macros.h
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+
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# Generate version maps, but wait until sysdep-subdirs is known
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ifeq ($(sysd-sorted-done),t)
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ifeq ($(build-shared),yes)
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