Intel C/C++ compilers complete adoption of LLVM

Re:Intel C/C++ compilers complete adoption of LLVM by account42 on Thursday August 12, 2021 @08:09AM (#28155199)

There is significant investment in building Linux with Clang so I wouldn't count on Linux keeping GCC relevant forever. Doubly so with the inevitable rustc requirement.

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Re:Intel C/C++ compilers complete adoption of LLVM by belgesel on Thursday August 12, 2021 @10:56AM (#28157104)

Isn't that the other way around? I thought clang was trying to support all gcc extensions to be able to build Linux kernel.

I would rather see both of these compilers to stay competitive to push themselves higher.

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Re:Intel C/C++ compilers complete adoption of LLVM by jabl on Friday August 13, 2021 @02:28AM (#28166085)

Kind of both. They've added some gcc-specific extensions to clang, but also removed some gcc-ism's from the Linux kernel.

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Re:Intel C/C++ compilers complete adoption of LLVM by pjmlp on Thursday August 12, 2021 @01:04PM (#28158801)

clang already builds Linux kernel on Mountain View dungeons, and it has been doing that for a couple of years now.

Those changes just don't get to upstream.

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Re:Intel C/C++ compilers complete adoption of LLVM by rincebrain on Thursday August 12, 2021 @04:52PM (#28161305)

That's...not true?

https://www.kernel.org/doc/html/latest/kbuild/llvm.html

I could be missing something, but I don't see any suggestion that you need a specific forked tree with patches to build with LLVM, and I've seen people filing bugs about using LLVM sanitizers to build the vanilla tree, so I don't think the expectation is that you need to apply a huge out of tree patchset for this to work any more?

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Re:Intel C/C++ compilers complete adoption of LLVM by yyyk on Thursday August 12, 2021 @07:19PM (#28162978)

There's an semi-official github[0] for this.

AFAICT from the issues page, Clang and binutils/LLVM tools work fine with no patches for the mainstream archs and when not trying to be super-fancy with custom flags. The more non-mainstream one goes with arch or flags the more likely one will run into something.

[0] https://github.com/ClangBuiltLinux/linux/issues (Note they use github for issues/wiki, not code, so no surprise the 'linux version' in code is oldish).

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Re:Intel C/C++ compilers complete adoption of LLVM by pjmlp on Thursday August 12, 2021 @05:35PM (#28161812)

I follow Android, not Linux itself.

My latest update was that not all patches were accepted upstream, or Google didn't care about upstreaming them, whatever.

There are some Linux Plumbers talks, or from Linaro, about this a years back.

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Re:Intel C/C++ compilers complete adoption of LLVM by pjmlp on Thursday August 12, 2021 @08:28AM (#28155375)

The ongoing efforts to add a Rust frontend to GCC prove otherwise.

No Rust in GCC? No play.

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Re:Intel C/C++ compilers complete adoption of LLVM by account42 on Thursday August 12, 2021 @08:47AM (#28155558)

Unlike C/C++, there is one canonical rustc where the language is developed and GCC will likely always play catch up.

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Re:Intel C/C++ compilers complete adoption of LLVM by pjmlp on Thursday August 12, 2021 @09:48AM (#28156290)

It doesn't matter, if only GCC gets to play with Linux kernel.

Rust is only following down the footsteps of D and Go.

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Re:Intel C/C++ compilers complete adoption of LLVM by pjmlp on Thursday August 12, 2021 @11:28AM (#28157544)

Android Linux fork compiles with clang for ages now. Upstream doesn't want them.

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