[cfe-dev] Clang to find its own headers

Ilya Biryukov via cfe-dev cfe-dev at lists.llvm.org
Thu Jan 10 09:32:46 PST 2019

HI Máté,

Make sure you build both 'clang' and 'clang-headers', the latter actually
copies the headers to the build directory.

The install should be relocatable, but make sure to also include the
internal headers and put them into the following structure:
<install-dir>/bin/... <-- other binaries/symlinks go here
<install-dir>/lib/<version>/include/ <-- headers should go here

On Thu, Jan 10, 2019 at 11:27 AM Máté Ferenc Nagy-Egri via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hi!
> Forgive my noobish question, I’m new to actually touching the Clang/LLVM
> codebase.
> Where is it coded how Clang finds its own headers from under
> ’lib/clang/7.0.0/include’? I’m helping with the packaging of LLVM on
> Windows for Vcpkg and the resulting Clang install doesn’t work, it fails to
> finds its own headers. Are Clang installs relocatable? Vcpkg builds
> packages out of source into a staging directory. If both Debug and Release
> builds go fine, it does a few extra checks and copies the result of the
> ’install’ target which went to the staging dir to its final location. I
> don’t know if this workflow causes the problem or the layout is different
> than what Clang would expect.
> Where should I start looking?
> Cheers,
> Máté
> ps.: all this is in order to make POCL compile on Windows. As far as I saw
> there’s nothing prohibiting it (the ICD might), it’s just that the latest
> Windows install guide still mentions Clang 3.6. I already had to patch
> llvm-config.exe to report correct paths with the install layout enforced by
> Vcpkg, but the heders are still a problem.
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Ilya Biryukov
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