[cmake-developers] [CMake 0016059]: It is not possible to specify a linker different from the compiler to link a shared library

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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https://cmake.org/Bug/view.php?id=16059 
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Reported By:                Antonio
Assigned To:                
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Project:                    CMake
Issue ID:                   16059
Category:                   CMake
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
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Date Submitted:             2016-04-12 12:00 EDT
Last Modified:              2016-04-12 12:00 EDT
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Summary:                    It is not possible to specify a linker different
from the compiler to link a shared library
Description: 
In some situations, it might be convenient to specify a different linker than
the compiler. For example, for llvm combined with mingw, compiling with clang
and linking with gcc would work. The workaround proposed here
https://cmake.org/pipermail/cmake/2014-August/058268.html does not seem to work.

Steps to Reproduce: 
Requires 2 compilers to be there. In the attached project,
Configuring with 
D:\dummyProj\build> cmake ..\src -G "Eclipse CDT4 - Ninja"
-DCMAKE_TOOLCHAIN_FILE=..\src\Toolchain-LLVM.cmake 
-DCMAKE_LINKER=C:/Programs/mingw32_493_posix_dwarf/bin/g++.exe
-DCMAKE_CXX_LINK_EXECUTABLE="<CMAKE_LINKER> <FLAGS> <CMAKE_CXX_LINK_FLAGS>
<LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>" 
-DCMAKE_CXX_CREATE_SHARED_LIBRARY="<CMAKE_LINKER>
<CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS>
<CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET>
<OBJECTS> <LINK_LIBRARIES>"

Building will anyway lead to the following commands to be generated:
[1/2] C:\Programs\LLVM\bin\clang++.exe   -Ddummy_EXPORTS   -MMD -MT
CMakeFiles/dummy.dir/dummy.cpp.obj -MF CMakeFiles/dummy.dir/dummy.cpp.obj.d -o
CMakeFiles/dummy.dir/dummy.cpp.obj -c D:/dummyProj/src/dummy.cpp
[2/2] cmd.exe /C "cd . && C:\Programs\LLVM\bin\clang++.exe      -shared -o
libdummy.dll -Wl,--out-implib,libdummy.dll.a
-Wl,--major-image-version,0,--minor-image-version,0
CMakeFiles/dummy.dir/dummy.cpp.obj  -lkernel32 -luser32 -lgdi32 -lwinspool
-lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd ."
FAILED: cmd.exe /C "cd . && C:\Programs\LLVM\bin\clang++.exe      -shared -o
libdummy.dll -Wl,--out-implib,libdummy.dll.a
-Wl,--major-image-version,0,--minor-image-version,0
CMakeFiles/dummy.dir/dummy.cpp.obj  -lkernel32 -luser32 -lgdi32 -lwinspool
-lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd ."
C:\Programs\mingw32_493_posix_dwarf\i686-w64-mingw32\lib/libmingw32.a(lib32_libmingw32_a-pseudo-reloc.o):pseudo-reloc.c:(.text+0x1d6):
undefined reference to `__chkstk_ms'

clang++.exe: error: linker command failed with exit code 1 (use -v to see
invocation)

ninja: build stopped: subcommand failed.

The first command is correct, the second doesn't use g++ to link as desired.
Linking succeeds if g++ is replaced in the command line.
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Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2016-04-12 12:00 Antonio        New Issue                                    
2016-04-12 12:00 Antonio        File Added: dummyProj.zip                    
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