[clazy] [Bug 435854] New: Problems building clazy with MinGW

[Björn Schäpers]

https://bugs.kde.org/show_bug.cgi?id=435854

            Bug ID: 435854
           Summary: Problems building clazy with MinGW
           Product: clazy
           Version: unspecified
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: kde at hazardy.de
                CC: smartins at kde.org
  Target Milestone: ---

SUMMARY
I'm trying to build clazy with (MSYS2's) MinGW on Windows. I hit some issues,
for two I need help.

STEPS TO REPRODUCE
1. cmake -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Release
-DCMAKE_INSTALL_PREFIX=../$(LLVMINSTALLDIR) -DCMAKE_FIND_LIBRARY_SUFFIXES=.a
-DCLAZY_MAN_PAGE=OFF ../clazy
2. mingw32-make

OBSERVED RESULT
First Issue: Linking ClazyPlugin.dll fails, because the LLVM lib files have
mixed path separators and \ is not escaped, GCC eats it.
> llvm-config --libfiles
E:\llvm/lib/libLLVMWindowsManifest.a ...
I don't know if this is an error from LLVM, CMake (or its MinGW Makefiles
generator), GCC, or clazy. But I never had such an issue building QtCreator
(and its clang based plugins) or doxygen. I've found a work around with adding
string(REPLACE "\\" "/" LLVM_LIBS ${LLVM_LIBS})
in the FindLLVM.cmake.

Second Issue:
[100%] Linking CXX executable bin\clazy-standalone.exe
E:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
E:/llvm/lib/libclangASTMatchers.a(ASTMatchersInternal.cpp.obj):ASTMatchersInternal.cpp:(.text+0x1310):
multiple definition of
`clang::ast_matchers::internal::ASTMatchFinder::isTraversalIgnoringImplicitNodes()
const'; lib/libClazyPlugin.dll.a(d027125.o):(.text+0x0): first defined here

Following multiple symbols.

EXPECTED RESULT
First Issue: Either escaped backslashes or only forward slashes.

Second Issue: I assume the symbols should not be exported from the clazy
plugin.

SOFTWARE/OS VERSIONS
Windows: 7
Qt Version: 5.15.2

ADDITIONAL INFORMATION
Up to date msys2, self compiled Qt and LLVM.

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