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Subject: Re: How to get the source code of FreeBSD-Clang?
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From: Dimitry Andric <dim@FreeBSD.org>
In-Reply-To: <CAKtBrB7A2yPFF2iby7h7CmDcrR=dUQpOTFXV9gGypwGWVsUp1g@mail.gmail.com>
Date: Sun, 25 Jan 2015 16:39:11 +0100
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References: <CAKtBrB7A2yPFF2iby7h7CmDcrR=dUQpOTFXV9gGypwGWVsUp1g@mail.gmail.com>
To: Yue Chen <ycyc321@gmail.com>
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O 25 Jan 2015, at 06:16, Yue Chen <ycyc321@gmail.com> wrote:
> 
> When I use the original versions (even 3.4.1) of LLVM/Clang to compile
> FreeBSD kernel, it always has problems.
> 
> Since I need to modify something in LLVM source and then build the kernel,
> where can I get the FreeBSD-friendly Clang/LLVM source code?

See the contrib/llvm/patches directory for the list of patches that you
need to apply.  Not all of these are strictly needed to compile just a
kernel, but it is safest to just apply them all.

For 3.4.1, you can use the set available here:

  https://svnweb.freebsd.org/base/stable/10/contrib/llvm/patches/

Alternatively, you can compile the kernel using:

  make buildkernel WERROR= MK_FORMAT_EXTENSIONS=no

which should fix any errors that were emitted because of -Werror.

-Dimitry


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