lkml.org 
[lkml]   [2016]   [Nov]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 1/3] tools build: Add CFLAGS_REMOVE_* support
    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-0t59dihg30fh035xo69df3m8@git.kernel.org
    > Signed-off-by: Jiri Olsa <jolsa@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

    \
     
     \ /
      Last update: 2016-11-14 15:38    [W:2.770 / U:0.216 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site