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

[Edward Diener via cfe-dev]

On 6/13/2016 8:58 PM, Saleem Abdulrasool via cfe-dev wrote:
> On Sun, Jun 12, 2016 at 7:51 AM, Edward Diener via cfe-dev
> <cfe-dev at lists.llvm.org
> <mailto:cfe-dev at lists.llvm.org>> wrote:
>
>     I was successful building a 32-bit version clang from source on
>     Windows using gcc-5.3. When I try to build a 64-bit version of clang
>     on Windows with the triplet x86_64-w64-mingw32 and the 64-bit
>     version of gcc-5.3 I get as an error:
>
>         [482/563] Linking CXX executable bin\c-index-test.exe
>         FAILED: bin/c-index-test.exe
>         cmd.exe /C "cd . &&
>         C:\utilities\mingw-w64\x86_64-5.3.0-posix-seh-rt_v4-rev0\min
>         gw64\bin\c++.exe  -Wall -W -Wno-unused-parameter -Wwrite-strings
>         -Wcast-qual -Wn
>         o-missing-field-initializers -pedantic -Wno-long-long
>         -Wno-maybe-uninitialized -
>         Wdelete-non-virtual-dtor -Wno-comment -Werror=date-time
>         -std=gnu++11 -fno-common
>          -Woverloaded-virtual -fno-strict-aliasing  -O2
>          tools/clang/tools/c-index-test
>         /CMakeFiles/c-index-test.dir/c-index-test.c.obj
>         tools/clang/tools/c-index-test/C
>         MakeFiles/c-index-test.dir/core_main.cpp.obj  -o
>         bin\c-index-test.exe -Wl,--out-
>         implib,lib\libc-index-test.dll.a
>         -Wl,--major-image-version,0,--minor-image-versi
>         on,0  lib/libLLVMSupport.a lib/liblibclang.dll.a
>         lib/libclangAST.a lib/libclangB
>         asic.a lib/libclangFrontend.a lib/libclangIndex.a
>         C:/utilities/libxml/lib/libxml
>         2.lib lib/libclangFrontend.a lib/libclangDriver.a -lversion
>         lib/libclangParse.a
>         lib/libLLVMMCParser.a lib/libclangSerialization.a
>         lib/libclangSema.a lib/libclan
>         gEdit.a lib/libclangAnalysis.a lib/libLLVMBitReader.a
>         lib/libLLVMOption.a lib/li
>         bLLVMProfileData.a lib/libclangFormat.a
>         lib/libclangToolingCore.a lib/libclangAS
>         T.a lib/libclangRewrite.a lib/libclangLex.a lib/libclangBasic.a
>         lib/libLLVMCore.
>         a lib/libLLVMMC.a lib/libLLVMSupport.a -lpsapi -lshell32 -lole32
>         -luuid -lkernel
>         32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32
>         -luuid -lcomdlg32 -l
>         advapi32 && cd ."
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text+0x3066): undefined reference to
>         `xmlRelaxNGNewParserCtxt'
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text+0x307a): undefined reference to
>         `xmlRelaxNGParse'
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text+0x3085): undefined reference to `xmlParseDoc'
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text+0x3099): undefined reference to
>         `xmlRelaxNGNewValidCtxt'
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text+0x30a7): undefined reference to
>         `xmlRelaxNGValidateDoc'
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text+0x30bb): undefined reference to
>         `xmlGetLastError'
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text+0x30d3): undefined reference to
>         `xmlRelaxNGFreeValidCtxt'
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text+0x30db): undefined reference to `xmlFreeDoc'
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text+0x30e3): undefined reference to `xmlRelaxNGFree'
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text+0x30eb): undefined reference to
>         `xmlRelaxNGFreeParserCtxt'
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text+0x3452): undefined reference to
>         `xmlGetLastError'
>         tools/clang/tools/c-index-test/CMakeFiles/c-index-test.dir/c-index-test.c.obj:c-
>         index-test.c:(.text.startup+0x23): undefined reference to
>         `xmlCheckVersion'
>         collect2.exe: error: ld returned 1 exit status
>
>
>     Anyone know what I have to do to correct this problem ?
>
>
> You are failing to link against libxml2.  I don't have any idea why that
> would be the case.  I would recommend that you look at the cake output
> and see if it failed to find the 64-bit version of libxml2 on your
> installation.

Why is llvm/clang looking for libxml2 ? It's not a part of the 
mingw-64/gcc compiler being used to build llvm/clang.