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authorFlorian Weimer <fweimer@redhat.com>2022-01-14 16:09:20 +0100
committerFlorian Weimer <fweimer@redhat.com>2022-01-14 16:09:20 +0100
commitef7c6d42fe163a5e49a478c43e655ce4633fa5ba (patch)
tree6b81ceacb154c6386d4f4d4bb04490fb89ad3e8f /Makeconfig
parent5732a881aad24fac876f5505a212395048a7a483 (diff)
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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>
Diffstat (limited to 'Makeconfig')
-rw-r--r--Makeconfig9
1 files changed, 9 insertions, 0 deletions
diff --git a/Makeconfig b/Makeconfig
index 9b6fc6b..2e79077 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -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)