path: root/scripts/Makefile.build
diff options
authorSam Ravnborg <sam@neptun.(none)>2007-10-14 22:26:53 +0200
committerSam Ravnborg <sam@neptun.(none)>2007-10-14 22:26:53 +0200
commit0c53c8e6eb456cde30f2305421c605713856abc8 (patch)
tree6050c25f7aa7625d0b6b65df701e3e601d69a24d /scripts/Makefile.build
parenta0f97e06a43cf524e616f09e6af3398e1e9c1c5b (diff)
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')
1 files changed, 12 insertions, 2 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 8ef1d61ec22..d32b40048f1 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 $(kbuild-file)
+# If the save-* variables changed error out
+ ifneq ("$(save-cflags)","$(CFLAGS)")
+ $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS)
+ endif
include scripts/Makefile.lib
ifdef host-progs