Messages in this thread Patch in this message | | | Subject | Re: [PATCH] compiler-gcc: get back Clang build | From | Joe Perches <> | Date | Tue, 21 Aug 2018 03:39:43 -0700 |
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On Tue, 2018-08-21 at 15:48 +0900, Masahiro Yamada wrote: > Commit cafa0010cd51 ("Raise the minimum required gcc version to 4.6") > missed the fact that <linux/compiler-gcc.h> is included by Clang > as well as by GCC. > > Clang actually defines __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__ > and it looks like GCC 4.2.1. > > $ scripts/gcc-version.sh -p clang > 040201
Perhaps this would work, but I can't test it as my clang version doesn't otherwise build a defconfig and errors out with
$ make CC=clang arch/x86/Makefile:179: *** Compiler lacks asm-goto support.. Stop.
--- include/linux/compiler-gcc.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 3e70b7d4e9ed..3a06ad823fa4 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -3,6 +3,23 @@ #error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead." #endif +/* + * Override clang compiler version #defines + * + * compiler_types.h always #includes compiler-gcc.h before compiler-clang,h + * but clang sets these __GNUC version #defines to 4.2.1. + * This breaks the gcc minimum version of 4.6.0, so override the clang + * definitions to 4.6.0 + */ +#ifdef __clang__ + #undef __GNUC__ + #undef __GNUC_MINOR__ + #undef __GNUC_PATCHLEVEL__ + #define __GNUC__ 4 + #define __GNUC_MINOR__ 6 + #define __GNUC_PATCHLEVEL__ 0 +#endif +
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