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 <[email protected]>
Cc: [email protected] # 3.16+
Signed-off-by: Michal Marek <[email protected]>
This commit is contained in:
Michal Marek 2015-07-01 17:19:30 +02:00 • committed by Vineet Gupta
commit 61754c1875
2 changed files with 13 additions and 4 deletions

View file

@ -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