1. 21 Jan, 2019 1 commit
    • chuck cranor's avatar
      Compute implicit include directories from compiler output · 5990ecb7
      chuck cranor authored
       - CMakeParseImplicitIncludeInfo.cmake: new parser that extracts the
         compiler's include path from verbose output.  If the parser cannot
         parse the output, we fall back to the old behavior.  On osx we skip
         over framework directories (handled elsewhere).
      
       - CMakeDetermineCompilerABI.cmake:
           - use verbose flag in try_compile for ${src}
           - use new cmake_parse_implicit_include_info() to attempt extract
             implicit include directory path and if successful set
              CMAKE_${LANG}_IMPLICIT_INCLUDE_DIRECTORIES
      
       - CMakeCCompiler.cmake.in and CMakeCXXCompiler.cmake.in - preserve
         CMAKE_${LANG}_IMPLICIT_INCLUDE_DIRECTORIES value between runs in
         the same way CMAKE_${LANG}_IMPLICIT_LINK_DIRECTORIES is preserved
      
       - Tests/RunCMake/ParseImplicitIncludeInfo: tests for parse
         based on the older Tests/CMakeTests/ImplicitLinkInfoTest.cmake.in.
         The test runs a set of verbose compiler outputs collected from
         various machines through the parser and checks the results.  New
         compiler files can be added by dropping input/output files in the
         ParseImplicitIncludeInfo/data subdirectory and then adding the new set
         of files to the ${targets} list in ParseImplicitIncludeInfo.cmake.
         There is a helper CMakeLists.txt in ParseImplicitIncludeInfo/data
         that can help with the generation of test input files.
         NOTE: the standard cmake pre-commit hook rejects verbose compiler
         output with trailing spaces... you have to manually edit them out.
         This shouldn't impact the test.
      
      Note that both the parser and the test code can use CMAKE_${LANG}_COMPILER_*
      variables such as ${CMAKE_CXX_COMPILER_ID} to decide how to parse
      verbose compiler output.  For the test code, this requires us to
      save the variables values in the test input files.
      
      Fixes: #16291
      5990ecb7