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| author | Steven Rostedt <rostedt@goodmis.org> | 2008-05-14 21:30:29 -0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-23 22:43:33 +0200 |
| commit | 656ee82cc855027b2e994ad218519b09fa652cc1 (patch) | |
| tree | 0f2aa6d2ce2c87a7086e2563f820926f552bab1c /scripts/Makefile.lib | |
| parent | 4e491d14f2506b218d678935c25a7027b79178b1 (diff) | |
| download | lwn-656ee82cc855027b2e994ad218519b09fa652cc1.tar.gz lwn-656ee82cc855027b2e994ad218519b09fa652cc1.zip | |
kbuild: create new CFLAGS_REMOVE_(basename).o option
We currently have a way to add special CFLAGS to code, but we do not have a
way to remove them if needed.
With the case of ftrace, some files should simply not be profiled. Adding
the -pg flag to these files is simply a waste, and adding "notrace" to each
and every function is ugly.
Currently we put in "Makefile turd" [1] to stop the compiler from adding -pg
to certain files. This was clumsy and awkward.
This patch now adds the revese of CFLAGS_(basename).o with
CFLAGS_REMOVE_(basename).o. This allows developers to prevent certain
CFLAGS from being used to compile files. For example, we can now do
CFLAGS_REMOVE_string.o = -pg
to remove the -pg option from the string.o file in the lib directory.
Note: a space delimited list of options may be added to the REMOVE macro.
[1] - what David Miller called the workaronud to remove -pg
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'scripts/Makefile.lib')
| -rw-r--r-- | scripts/Makefile.lib | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index 8e440233c27d..ea48b82a3707 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -96,7 +96,8 @@ basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))" modname_flags = $(if $(filter 1,$(words $(modname))),\ -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") -_c_flags = $(KBUILD_CFLAGS) $(ccflags-y) $(CFLAGS_$(basetarget).o) +orig_c_flags = $(KBUILD_CFLAGS) $(ccflags-y) $(CFLAGS_$(basetarget).o) +_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags)) _a_flags = $(KBUILD_AFLAGS) $(asflags-y) $(AFLAGS_$(basetarget).o) _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) |