Messages in this thread | | | From | Miguel Ojeda <> | Date | Thu, 5 Aug 2021 20:17:40 +0200 | Subject | Re: [PATCH v6 2/3] Makefile: infer --target from ARCH for CC=clang |
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On Mon, Aug 2, 2021 at 8:39 PM 'Nick Desaulniers' via Clang Built Linux <clang-built-linux@googlegroups.com> wrote: > > We get constant feedback that the command line invocation of make is too > long when compiling with LLVM. CROSS_COMPILE is helpful when a toolchain > has a prefix of the target triple, or is an absolute path outside of > $PATH. > > Since a Clang binary is generally multi-targeted, we can infer a given > target from SRCARCH/ARCH. If CROSS_COMPILE is not set, simply set > --target= for CLANG_FLAGS, KBUILD_CFLAGS, and KBUILD_AFLAGS based on > $SRCARCH. > > Previously, we'd cross compile via: > $ ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make LLVM=1 LLVM_IAS=1 > Now: > $ ARCH=arm64 make LLVM=1 LLVM_IAS=1 > > For native builds (not involving cross compilation) we now explicitly > specify a target triple rather than rely on the implicit host triple. > > Link: https://github.com/ClangBuiltLinux/linux/issues/1399 > Suggested-by: Arnd Bergmann <arnd@kernel.org> > Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> > Suggested-by: Masahiro Yamada <masahiroy@kernel.org> > Suggested-by: Nathan Chancellor <nathan@kernel.org> > Acked-by: Arnd Bergmann <arnd@kernel.org> > Reviewed-by: Nathan Chancellor <nathan@kernel.org> > Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Cheers, Miguel
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