Messages in this thread | | | Date | Mon, 7 Sep 2015 22:31:01 +0200 | Subject | Re: Use (two) different compilers at build-time? | From | Sedat Dilek <> |
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On Mon, Sep 7, 2015 at 10:15 PM, Linus Torvalds <torvalds@linux-foundation.org> wrote: > On Mon, Sep 7, 2015 at 12:12 PM, Sedat Dilek <sedat.dilek@gmail.com> wrote: >> >> is it possible to use a different compiler at build-time? >> >> I have here a problem with mm/percpu.c and wanted to build everything >> with LLVM/Clang but this single file with GCC. >> >> Is that possible? > > It should work fine. It's occasionally how people bisect compiler bugs > in the kernel (although then it's usually just two different versions > of the same compiler), and I think people have done that with llvm > too. After all, llvm object files link to gcc-produced object files in > user space (ie libraries are most often compiled with different > compilers). > > So no _guarantees_ (especially since the kernel sometimes does odd > things), but there's no overwhelming reason it shouldn't work, and > there are several reasons it should be fine. >
OK.
So, how do I do that conveniently?
In case of percpu.o - hack in the mm/Makefile?
So, I have a percpu.o compiled with clang in my build-dir and want to recompile just that single file with gcc and create a new bzImage.
Hope I could explain it more exactly.
- Sedat -
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