Mingw #2
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Add MinGW GNU compiler support. Also update CMake minimum version, since some of the newer generator features are used.
If CMAKE_INSTALL_PREFIX defaults (not set) on initial run, nail the
prefix to ${CMAKE_SOURCE_DIR}/PTHREADS-BUILT. And make sure it persists
across subsequent runs.
Also found a minor cleanup when setting target compile flags.
Fix GCC warning about "char *" used with immutable strings. It's also a bad idea to cast a pointer to int. Use ptrdiff_t instead.
Use PRIVATE for all target defines, libraries, options, etc. PUBLIC ends up adding extra flags to library dependents because it alters the INTERFACE and PRIVATE target properties at the same time. So, if libpthreadGC3 gets build with __PTW32_BUILD and that definition is added to the libpthreadGC3 target (target_compile_definitions) with PUBLIC, the test cases inherit the __PTW32_BUILD define. It's almost worse than using add_compile_definitions. Punchline: Localize target flags, definitions, options and libraries using PRIVATE. Note: 100% of the tests pass for GNU x64. Some fail for x86. This can be attributed to the difference in C++ exception handling. x64 uses SEH, x86 uses SJLJ.
- Generate config.h in ${CMAKE_BINARY_DIR} instead of overwriting
config.h in the top-level source directory. Arrange the include
directory list to ensure it gets picked up before the top-level.
- Fat finger? Install tests for VC from the appropriate configuration
subdirectory.
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…mingw Also, workaround the new CMake source enforcement "feature", where CMake actually embeds the source type on the MSVC command line (i.e., "/TC" for C source, "/TP" for C++ source.)
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Renamed "gnu_compiler" branch to "mingw" (works better when using CMake's ExternalPackage_Add)