[cfe-dev] Failure building x86_64-w64-mingw32 triplet of clang on Windows

[Edward Diener via cfe-dev]

On 6/14/2016 10:40 AM, Yaron Keren via cfe-dev wrote:
> libxml is optional library, used if found.

Where in the llvm/clang CMake files is libxml specified ?

> Maybe CMake finds your libxml2 but does not check if its 32 or 64 bit,
> just assumes it's the right one?

I queried this on the CMake mailing list and am awaiting some answer 
from them. But I expect that if I get one it will be to ask where 
llvm/clang specifies libxml in its CMakeLists.txt files.

>
>
>
> 2016-06-14 16:59 GMT+03:00 NAKAMURA Takumi via cfe-dev
> <cfe-dev at lists.llvm.org
> <mailto:cfe-dev at lists.llvm.org>>:
>
>     On Tue, Jun 14, 2016 at 10:50 PM Edward Diener via cfe-dev
>     <cfe-dev at lists.llvm.org
>     <mailto:cfe-dev at lists.llvm.org>> wrote:
>
>         On 6/14/2016 8:21 AM, NAKAMURA Takumi via cfe-dev wrote:
>         > I guess you are building on msys2 with external mingw-w64.
>
>         No, I am not. Ninja is calling mingw-64/gcc-5.3 directly to build
>         llvm/clang
>
>         .
>
>         > CMake picks up msys2's libxml2, I guess.
>
>         I do have a 32-bit libxml2 on my Windows PATH from the GnuWin32
>         package.
>         But why is a build of llvm/clang requiring libxml2, whether a
>         32-bit or
>         64-bit version ?
>
>
>     I don't know why CMake finds but doesn't ignore it.
>     c-index-test uses libxml2 if available. libxml2 is not essential.
>
>     We could add extra checks if libxml2 would be really available.
>
>         > Could you try overriding CMake and reconfigure?
>         > -DCMAKE_LIBRARY_PATH="C:/mingw-w64/x86_64-4.9.3-posix-seh-rt_v4-rev1/mingw64/x86_64-w64-mingw32/lib"
>
>         Why would using gcc-4.9.3 make any difference ?
>
>
>     Excuse me. It was just an example. Please substitute with your
>     mingw-w64's path.