BUG: symbols duplicated between gtest & gmock on windows

[h-vetinari]

Seen in conda-forge/abseil-cpp-feedstock#58, it appears that there are symbols which appear in both gtest and gmock:

[139/601] Linking CXX executable bin\absl_atomic_hook_test.exe
FAILED: bin/absl_atomic_hook_test.exe 
cmd.exe /C "cd . && D:\bld\abseil-split_1681891785618\_build_env\Library\bin\cmake.exe -E vs_link_exe --intdir=absl\base\CMakeFiles\absl_atomic_hook_test.dir --rc=C:\PROGRA~2\WI3CF2~1\10\bin\100226~1.0\x64\rc.exe --mt=C:\PROGRA~2\WI3CF2~1\10\bin\100226~1.0\x64\mt.exe --manifests  -- C:\PROGRA~1\MICROS~2\2022\ENTERP~1\VC\Tools\MSVC\1429~1.301\bin\HostX64\x64\link.exe /nologo absl\base\CMakeFiles\absl_atomic_hook_test.dir\internal\atomic_hook_test.cc.obj  /out:bin\absl_atomic_hook_test.exe /implib:absl\base\absl_atomic_hook_test.lib /pdb:bin\absl_atomic_hook_test.pdb /version:0.0 /machine:x64 /INCREMENTAL:NO /subsystem:console  absl\base\absl_atomic_hook_test_helper.lib  absl\abseil_dll.lib  D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gmock-md.lib  D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gtest_main-md.lib  D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gtest-md.lib  kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib && cd ."
LINK: command "C:\PROGRA~1\MICROS~2\2022\ENTERP~1\VC\Tools\MSVC\1429~1.301\bin\HostX64\x64\link.exe /nologo absl\base\CMakeFiles\absl_atomic_hook_test.dir\internal\atomic_hook_test.cc.obj /out:bin\absl_atomic_hook_test.exe /implib:absl\base\absl_atomic_hook_test.lib /pdb:bin\absl_atomic_hook_test.pdb /version:0.0 /machine:x64 /INCREMENTAL:NO /subsystem:console absl\base\absl_atomic_hook_test_helper.lib absl\abseil_dll.lib D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gmock-md.lib D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gtest_main-md.lib D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gtest-md.lib kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib /MANIFEST /MANIFESTFILE:bin\absl_atomic_hook_test.exe.manifest" failed (exit code 1169) with the following output:
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "bool __cdecl testing::internal::IsTrue(b[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "class std::basic_string<char,struct std:[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "class testing::AssertionResult __cdecl t[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "class testing::AssertionResult __cdecl t[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "class testing::AssertionResult __cdecl t[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "class testing::TestInfo * __cdecl testin[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "private: virtual struct testing::Test::S[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "private: void __cdecl testing::Assertion[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "protected: __cdecl testing::Test::Test(v[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "protected: virtual void __cdecl testing:[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "protected: virtual void __cdecl testing:[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: __cdecl testing::AssertionResult[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: __cdecl testing::AssertionResult[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: __cdecl testing::MatcherDescribe[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: __cdecl testing::Message::Messag[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: __cdecl testing::Message::~Messa[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: __cdecl testing::internal::Asser[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: __cdecl testing::internal::Asser[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: __cdecl testing::internal::GTest[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: __cdecl testing::internal::GTest[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: char const * __cdecl testing::As[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: class std::basic_ostream<char,st[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: virtual __cdecl testing::Matcher[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: virtual __cdecl testing::Test::~[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "public: void __cdecl testing::internal::[...]" already defined in gmock-md.lib(gmock.dll)
gtest-md.lib(gtest-all.cc.obj) : error LNK2005: "void const * __cdecl testing::internal::[...]" already defined in gmock-md.lib(gmock.dll)
bin\absl_atomic_hook_test.exe : fatal error LNK1169: one or more multiply defined symbols found

Seems to depend on the order with which these two libs appear in the linker CLI:

[140/601] Linking CXX shared library bin\abseil_test_dll.dll
FAILED: bin/abseil_test_dll.dll absl/abseil_test_dll.lib 
cmd.exe /C "cmd.exe /C "D:\bld\abseil-split_1681891785618\_build_env\Library\bin\cmake.exe -E __create_def D:\bld\abseil-split_1681891785618\work\build\absl\CMakeFiles\abseil_test_dll.dir\.\exports.def D:\bld\abseil-split_1681891785618\work\build\absl\CMakeFiles\abseil_test_dll.dir\.\exports.def.objs && cd D:\bld\abseil-split_1681891785618\work\build" && D:\bld\abseil-split_1681891785618\_build_env\Library\bin\cmake.exe -E vs_link_dll --intdir=absl\CMakeFiles\abseil_test_dll.dir --rc=C:\PROGRA~2\WI3CF2~1\10\bin\100226~1.0\x64\rc.exe --mt=C:\PROGRA~2\WI3CF2~1\10\bin\100226~1.0\x64\mt.exe --manifests  -- C:\PROGRA~1\MICROS~2\2022\ENTERP~1\VC\Tools\MSVC\1429~1.301\bin\HostX64\x64\link.exe /nologo absl\CMakeFiles\abseil_test_dll.dir\log\scoped_mock_log.cc.obj  /out:bin\abseil_test_dll.dll /implib:absl\abseil_test_dll.lib /pdb:bin\abseil_test_dll.pdb /dll /version:0.0 /machine:x64 /INCREMENTAL:NO  /DEF:absl\CMakeFiles\abseil_test_dll.dir\.\exports.def  absl\abseil_dll.lib  D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gtest-md.lib  D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gmock-md.lib  D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gtest-md.lib  kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib  && cd ."
LINK: command "C:\PROGRA~1\MICROS~2\2022\ENTERP~1\VC\Tools\MSVC\1429~1.301\bin\HostX64\x64\link.exe /nologo absl\CMakeFiles\abseil_test_dll.dir\log\scoped_mock_log.cc.obj /out:bin\abseil_test_dll.dll /implib:absl\abseil_test_dll.lib /pdb:bin\abseil_test_dll.pdb /dll /version:0.0 /machine:x64 /INCREMENTAL:NO /DEF:absl\CMakeFiles\abseil_test_dll.dir\.\exports.def absl\abseil_dll.lib D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gtest-md.lib D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gmock-md.lib D:\bld\abseil-split_1681891785618\_h_env\Library\lib\gtest-md.lib kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib /MANIFEST /MANIFESTFILE:bin\abseil_test_dll.dll.manifest" failed (exit code 1169) with the following output:
gmock-md.lib(gmock.dll) : error LNK2005: "bool __cdecl testing::internal::IsTrue(b[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "class std::basic_string<char,struct std:[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: __cdecl testing::Matcher<class s[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: __cdecl testing::MatcherDescribe[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: __cdecl testing::internal::GTest[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: __cdecl testing::internal::GTest[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: bool __cdecl testing::internal::[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: bool __cdecl testing::internal::[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: class std::basic_ostream<char,st[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: static class testing::internal::[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: virtual __cdecl testing::Matcher[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: virtual __cdecl testing::Matcher[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: virtual void __cdecl testing::in[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: void __cdecl testing::internal::[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: void __cdecl testing::internal::[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "public: void __cdecl testing::internal::[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "void __cdecl testing::internal::PrintByt[...]" already defined in gtest-md.lib(gtest-all.cc.obj)
gmock-md.lib(gmock.dll) : error LNK2005: "void __cdecl testing::internal::PrintStr[...]" already defined in gtest-md.lib(gtest-all.cc.obj)

bin\abseil_test_dll.dll : fatal error LNK1169: one or more multiply defined symbols found

Host env:

  environment location: D:\bld\abseil-split_1681891785618\_h_env


The following NEW packages will be INSTALLED:

    gmock:          1.13.0-h91493d7_0       conda-forge
    gtest:          1.13.0-h91493d7_0       conda-forge
    ucrt:           10.0.22621.0-h57928b3_0 conda-forge
    vc:             14.3-hb6edc58_10        conda-forge
    vs2015_runtime: 14.34.31931-h4c5c07a_10 conda-forge