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The cmGlobalGenerator::ResolveLanguageCompiler method, invoked only by Makefile generators, contains code originally added by commit v2.4.0~796 (..., add new generators for msys and mingw, 2005-12-22) to compute the full path to the compiler and save the result back into the cache value. Since then the CMakeDetermine*Compiler modules have learned to resolve the full path to the compiler and save it in CMake*Compiler.cmake files configured in the build tree. The value of CMAKE_<LANG>_COMPILER in the cache is now only for reference of what the user originally specified. The full path is now available in a normal variable of the same name, and this is used by project code and the generators. When the user specifies -DCMAKE_<LANG>_COMPILER=name on the command-line of an existing build tree that uses a Makefile generator, it is first stored in the cache with an uninitialized type. Then later when ResolveLanguageCompiler updates the cache entry and sets the type to FILEPATH, cmMakefile::AddCacheDefinition does CollapseFullPath on the "name" and ends up with something like "$PWD/name" which is unlikely to be correct. Furthermore, cmMakefile::AddCacheDefinition proceeds to remove the normal variable of the same name, so the value originally saved in CMake<LANG>Compiler.cmake is ignored and the generators use the wrong path to the compiler. Resolve this by dropping the code from ResolveLanguageCompiler that touches the cache value of CMAKE_<LANG>_COMPILER. As explained above it is no longer needed anyway.
CMake ***** Introduction ============ CMake is a cross-platform, open-source build system generator. For full documentation visit the `CMake Home Page`_ and the `CMake Documentation Page`_. .. _`CMake Home Page`: http://www.cmake.org .. _`CMake Documentation Page`: http://www.cmake.org/cmake/help/documentation.html CMake is maintained and supported by `Kitware`_ and developed in collaboration with a productive community of contributors. .. _`Kitware`: http://www.kitware.com/cmake License ======= CMake is distributed under the OSI-approved BSD 3-clause License. See `Copyright.txt`_ for details. .. _`Copyright.txt`: Copyright.txt Building CMake ============== Supported Platforms ------------------- MS Windows, Mac OS X, Linux, FreeBSD, Solaris, HP-UX, IRIX, BeOS, QNX Other UNIX-like operating systems may work too out of the box, if not it should not be a major problem to port CMake to this platform. Subscribe and post to the `CMake Users List`_ to ask if others have had experience with the platform. .. _`CMake Users List`: http://www.cmake.org/mailman/listinfo/cmake Building CMake from Scratch --------------------------- UNIX/Mac OSX/MinGW/MSYS/Cygwin ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ You need to have a compiler and a make installed. Run the ``bootstrap`` script you find the in the source directory of CMake. You can use the ``--help`` option to see the supported options. You may use the ``--prefix=<install_prefix>`` option to specify a custom installation directory for CMake. You can run the ``bootstrap`` script from within the CMake source directory or any other build directory of your choice. Once this has finished successfully, run ``make`` and ``make install``. In summary:: $ ./bootstrap && make && make install Windows ^^^^^^^ You need to download and install a binary release of CMake in order to build CMake. You can get these releases from the `CMake Download Page`_ . Then proceed with the instructions below. .. _`CMake Download Page`: http://www.cmake.org/cmake/resources/software.html Building CMake with CMake ------------------------- You can build CMake as any other project with a CMake-based build system: run the installed CMake on the sources of this CMake with your preferred options and generators. Then build it and install it. For instructions how to do this, see documentation on `Running CMake`_. .. _`Running CMake`: http://www.cmake.org/cmake/help/runningcmake.html Contributing ============ See `CONTRIBUTING.rst`_ for instructions to contribute. .. _`CONTRIBUTING.rst`: CONTRIBUTING.rst