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authorJiri Olsa <jolsa@kernel.org>2016-11-02 14:35:47 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-11-14 11:37:25 -0300
commit2ec8107d8e0d1d285b2bbf1999e7f4e46b6b535b (patch)
treea16750cef61a1b5449b1814c95e76aab88b2aeb5 /tools/build
parent699c12a7cca376d16f75672f9047faa37b184eda (diff)
downloadlwn-2ec8107d8e0d1d285b2bbf1999e7f4e46b6b535b.tar.gz
lwn-2ec8107d8e0d1d285b2bbf1999e7f4e46b6b535b.zip
tools build: Add CFLAGS_REMOVE_* support
Adding support to remove options from final CFLAGS for both object file and build target. It's now possible to remove CFLAGS options like: CFLAGS_REMOVE_krava.o += -Wstrict-prototypes Committer notes: This comes from the kernel's kbuild infrastructure, the subset that is supported in tools/ is being documented at tools/build/Documentation/Build.txt. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Stephane Eranian <eranian@google.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: William Cohen <wcohen@redhat.com> Link: http://lkml.kernel.org/r/1478093749-5602-2-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/build')
-rw-r--r--tools/build/Build.include4
-rw-r--r--tools/build/Documentation/Build.txt6
2 files changed, 7 insertions, 3 deletions
diff --git a/tools/build/Build.include b/tools/build/Build.include
index 1dcb95e76f70..c4ae12a5d0a5 100644
--- a/tools/build/Build.include
+++ b/tools/build/Build.include
@@ -89,7 +89,9 @@ if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
# - per target C flags
# - per object C flags
# - BUILD_STR macro to allow '-D"$(variable)"' constructs
-c_flags = -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj))
+c_flags_1 = -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj))
+c_flags_2 = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(c_flags_1))
+c_flags = $(filter-out $(CFLAGS_REMOVE_$(obj)), $(c_flags_2))
cxx_flags = -Wp,-MD,$(depfile),-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj))
###
diff --git a/tools/build/Documentation/Build.txt b/tools/build/Documentation/Build.txt
index a47bffbae159..a22587475dbe 100644
--- a/tools/build/Documentation/Build.txt
+++ b/tools/build/Documentation/Build.txt
@@ -135,8 +135,10 @@ CFLAGS
It's possible to alter the standard object C flags in the following way:
- CFLAGS_perf.o += '...' - alters CFLAGS for perf.o object
- CFLAGS_gtk += '...' - alters CFLAGS for gtk build object
+ CFLAGS_perf.o += '...' - adds CFLAGS for perf.o object
+ CFLAGS_gtk += '...' - adds CFLAGS for gtk build object
+ CFLAGS_REMOVE_perf.o += '...' - removes CFLAGS for perf.o object
+ CFLAGS_REMOVE_gtk += '...' - removes CFLAGS for gtk build object
This C flags changes has the scope of the Build makefile they are defined in.