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| author | Sam Ravnborg <sam@neptun.(none)> | 2007-10-14 22:26:53 +0200 |
|---|---|---|
| committer | Sam Ravnborg <sam@neptun.(none)> | 2007-10-14 22:26:53 +0200 |
| commit | 0c53c8e6eb456cde30f2305421c605713856abc8 (patch) | |
| tree | 6050c25f7aa7625d0b6b65df701e3e601d69a24d /scripts/Makefile.build | |
| parent | kbuild: enable 'make CFLAGS=...' to add additional options to CC (diff) | |
| download | linux-0c53c8e6eb456cde30f2305421c605713856abc8.tar.xz linux-0c53c8e6eb456cde30f2305421c605713856abc8.zip | |
kbuild: check for wrong use of CFLAGS
External modules have in a few cases modifed gcc option
by modifying CFLAGS. This has never been documented and
was a bad practice.
With the check to use KBUILD_CFLAGS it will no longer work
so we better error out and tell what was wrong as a service
to the external module users.
This check can be overruled if
KBUILD_NOPEDANTIC is set to something.
Addid this possibility may allow older external
module to build without any code modifications but potentially
only loosing some un-important gcc options.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Diffstat (limited to 'scripts/Makefile.build')
| -rw-r--r-- | scripts/Makefile.build | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 8ef1d61ec228..d32b40048f1f 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -28,10 +28,20 @@ EXTRA_LDFLAGS := include scripts/Kbuild.include +# For backward compatibility check that these variables does not change +save-cflags := $(CFLAGS) + # The filename Kbuild has precedence over Makefile kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) -include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile) - +kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) +include $(kbuild-file) + +# If the save-* variables changed error out +ifeq ($(KBUILD_NOPEDANTIC),) + ifneq ("$(save-cflags)","$(CFLAGS)") + $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS) + endif +endif include scripts/Makefile.lib ifdef host-progs |