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

[Yaron Keren via cfe-dev]

clang calls CMake find_package(libxml2) to find libxml2.
This is implemented in the CMake standard module
"/usr/share/cmake-3.5/Modules/FindLibXml2.cmake".



2016-06-15 9:12 GMT+03:00 Edward Diener via cfe-dev <cfe-dev at lists.llvm.org>
:

> 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.
>>
>
>
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