[CMake] Finding libxml2 when building llvm/clang

[Chuck Atkins]

You could try to force libxml to be ignored by CMake so it will think it
wasn't found and use the fallback configuration:

cmake ... -DLIBXML2_LIBRARIES=IGNORE ...

- Chuck

On Tue, Jun 14, 2016 at 8:28 PM, Edward Diener <
eldlistmailingz at tropicsoft.com> wrote:

> Building llvm/clang from source involves using CMake. I am building
> llvm/clang from source on Windows using CMake 3.5.2. I am not a clang
> developer, just a clang user. Similarly I just use CMake rather than
> understand or write CMakeLists.txt files.
>
> I reported a problem to clang where building a 32-bit version of clang
> succeeds but building a 64-bit version of clang fails with xml link errors.
> I have A 32-bit libxml2 binary in my path from gnuwin32, but not a 64-bit
> binary of libxml2 in my path.
>
> I was told by clang developers that one of the tools which clang builds
> uses xml and libxml2 if it is available, otherwise uses some other
> technology for the tool. The suggestion was that the problem I am
> encountering is that of CMake; that CMake does not recognize that the
> libxml2 which I have is the 32-bit version and instead thinks that it is
> the 64-bit version and therefore attempts erroneously to use it in the
> 64-bit build of clang.
>
> Does anybody know what might be happening here ? I do not create the
> CMakeLists.txt files used by llvm/clang so I do not know how the use of
> libxml2 can be optionally specified in them.
>
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