Em Wed, Nov 02, 2016 at 02:35:47PM +0100, Jiri Olsa escreveu: > 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
That is cool, and I just looked and this comes from the kernel sources, is there some place where the subset of such features that is supported in tools/build is being documented? Applying it, thanks. - Arnaldo > Link: http://lkml.kernel.org/n/tip-0t59dihg30fh035xo69df...@git.kernel.org > Signed-off-by: Jiri Olsa <jo...@kernel.org> > --- > tools/build/Build.include | 4 +++- > tools/build/Documentation/Build.txt | 6 ++++-- > 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. > > -- > 2.7.4
