On Mon, Aug 2, 2021 at 8:39 PM 'Nick Desaulniers' via Clang Built Linux <clang-built-linux@xxxxxxxxxxxxxxxx> 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@xxxxxxxxxx> > Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > Suggested-by: Masahiro Yamada <masahiroy@xxxxxxxxxx> > Suggested-by: Nathan Chancellor <nathan@xxxxxxxxxx> > Acked-by: Arnd Bergmann <arnd@xxxxxxxxxx> > Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx> > Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Acked-by: Miguel Ojeda <ojeda@xxxxxxxxxx> Cheers, Miguel
