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| author | Michal Marek <mmarek@suse.cz> | 2015-07-01 17:19:30 +0200 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2015-08-10 09:54:09 +0100 |
| commit | 4a9e44d553883de66707cb55fc6066a1b1f28cda (patch) | |
| tree | c33ab7d53983c5509456bdaff84bdc1379a747b1 /Documentation | |
| parent | 8891356283cfc8c11548d7d1f658d664ebc699a1 (diff) | |
kbuild: Allow arch Makefiles to override {cpp,ld,c}flags
commit 61754c18752ffb78145671e94f053fb202fff041 upstream.
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>
Signed-off-by: Michal Marek <mmarek@suse.com>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/kbuild/makefiles.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt index c600e2f44a62..a2b03386e239 100644 --- a/Documentation/kbuild/makefiles.txt +++ b/Documentation/kbuild/makefiles.txt @@ -976,6 +976,14 @@ 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 |