[cfe-dev] Clang to find its own headers

Petr Hosek via cfe-dev cfe-dev at lists.llvm.org
Thu Jan 10 08:36:27 PST 2019


The CMake variable is called CLANG_RESOURCE_DIR, defined here:

https://github.com/llvm-mirror/clang/blob/master/CMakeLists.txt#L217

If unset, the driver computes the path:

https://github.com/llvm-mirror/clang/blob/master/lib/Driver/Driver.cpp#L121

On Thu, Jan 10, 2019 at 6:45 AM Máté Ferenc Nagy-Egri via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> It might be true. clang.exe resides in
>
>
>
> <vcpkg_root>/installed/<triplet>/tools/llvm/
>
>
>
> whereas the includes are in
>
>
>
> <vcpkg_root>/installed/<triplet>/lib/clang/<version>/include
>
>
>
> so the way to reach them is ../../lib/clang/<version>/include
>
>
>
> Can I change this with configuring Clang? I don’t see any CMake param to
> LLVM that would controll this. Is this hardcoded? Where must I patch it?
>
>
>
> *Feladó: *Kim Gräsman via cfe-dev [via Clang Developers]
> <ml+s42468n4063493h51 at n3.nabble.com>
> *Elküldve: *2019. január 10., csütörtök 11:58
> *Címzett: *Meteorhead <csiga.biga at aol.com>
> *Tárgy: *Re: Clang to find its own headers
>
>
>
> On 2019-01-10 11:27, Máté Ferenc Nagy-Egri via cfe-dev 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.
>
>
> On Posix Clang expects the internal include files to be present relative
> to the binary: ../lib/clang/<version>/include. Where "<version>" is the
> version of Clang. Not sure if the same is true on Windows.
>
> --
> /Jacob Carlborg
>
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