path: root/Documentation/kbuild/makefiles.txt
diff options
authorMichal Marek <mmarek@suse.cz>2015-07-01 17:19:30 +0200
committerVineet Gupta <vgupta@synopsys.com>2015-07-06 11:09:00 +0530
commit61754c18752ffb78145671e94f053fb202fff041 (patch)
tree30468e47109348f877c50a8c2ae176cd735ad5e7 /Documentation/kbuild/makefiles.txt
parentARCv2: guard SLC DMA ops with spinlock (diff)
kbuild: Allow arch Makefiles to override {cpp,ld,c}flags
Since commit a1c48bb1 (Makefile: Fix unrecognized cross-compiler command line options), the arch Makefile is included earlier by the main Makefile, preventing the arc architecture to set its -O3 compiler option. Since there might be more use cases for an arch Makefile to fine-tune the options, add support for ARCH_CPPFLAGS, ARCH_AFLAGS and ARCH_CFLAGS variables that are appended to the respective kbuild variables. The user still has the final say via the KCPPFLAGS, KAFLAGS and KCFLAGS variables. Reported-by: Vineet Gupta <Vineet.Gupta1@synopsys.com> Cc: stable@vger.kernel.org # 3.16+ Signed-off-by: Michal Marek <mmarek@suse.com>
Diffstat (limited to 'Documentation/kbuild/makefiles.txt')
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index e63b446d973c..13f888a02a3d 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -952,6 +952,14 @@ When kbuild executes, the following steps are followed (roughly):
$(KBUILD_ARFLAGS) set by the top level Makefile to "D" (deterministic
mode) if this option is supported by $(AR).
+ ARCH_CPPFLAGS, ARCH_AFLAGS, ARCH_CFLAGS Overrides the kbuild defaults
+ These variables are appended to the KBUILD_CPPFLAGS,
+ KBUILD_AFLAGS, and KBUILD_CFLAGS, respectively, after the
+ top-level Makefile has set any other flags. This provides a
+ means for an architecture to override the defaults.
--- 6.2 Add prerequisites to archheaders:
The archheaders: rule is used to generate header files that