Eliminate `CROSS_COMPILE` for `LLVM=1 LLVM_IAS=1`

Question

Eliminate `CROSS_COMPILE` for `LLVM=1 LLVM_IAS=1`

nickdesaulniers opened this issue 3 years ago · 8 comments

m68k, arc, parisc, sh, h8300, and mips all use cc-cross-prefix to predefine CROSS_COMPILE. Why not use this on arm, arm64, x86_64? We might have a circular dependency with the order of including arch/ specific Makefiles though.

nickdesaulniers commented 3 years ago

Answer 1 · 2021-06-23T00:14:24.000Z

cc-cross-prefix hard codes an invocation of <triple>-gcc.

Answer 2 · 2021-06-30T19:58:53.000Z

@arndb had a good suggestion to limit this just to LLVM=1 for now. Perhaps we can set the --target value per arch/ specific Makefile, and completely ignore CROSS_COMPILE when LLVM=1 LLVM_IAS=1.

Answer 3 · 2021-07-01T23:58:39.000Z

Based on @arndb 's idea, I sent https://lore.kernel.org/lkml/20210701235505.1792711-1-ndesaulniers@google.com/ for arm64. If maintainers are supportive, I'll send similar patches for other architectures we currently support.

Answer 4 · 2021-07-07T22:44:33.000Z

https://lore.kernel.org/lkml/20210707224310.1403944-1-ndesaulniers@google.com/

Answer 5 · 2021-07-08T23:25:50.000Z

v2: https://lore.kernel.org/lkml/20210708232522.3118208-1-ndesaulniers@google.com/

Answer 6 · 2021-08-02T18:39:49.000Z

v6: https://lore.kernel.org/lkml/20210802183910.1802120-1-ndesaulniers@google.com/

Answer 7 · 2021-08-10T17:06:19.000Z

accepted
1: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git/commit/?h=for-next&id=6f5b41a2f5a6314614e286274eb8e985248aac60
2: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git/commit/?h=for-next&id=231ad7f409f16b9f9505f69e058dff488a7e6bde
3: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git/commit/?h=for-next&id=e08831baa032e62786d88b68e26c54389e2486b6