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1293ed8507
The first time you run cmake, it sets the implicit include path
to the value reported by the parser (and this value gets saved
in CMake${lang}Compiler.cmake). But if you re-run cmake,
UnixPaths.cmake blindly appends an extra /usr/include to the
value saved in CMake${lang}Compiler.cmake. That should not be
harmful in most cases, but we want later runs of cmake to be
consistent with the initial one. Resolve using a solution
suggested by Brad King:
- UnixPaths now sets the default implicit include path in a new
variable named _CMAKE_${lang}_IMPLICIT_INCLUDE_DIRECTORIES_INIT
This value is only used the first time cmake is run (by
CMakeDetermineCompilerABI.cmake when it calls the implicit
include parser).
- if CMakeDetermineCompilerABI.cmake successfully calls the
implicit include parser, it overwrites the value in
_CMAKE_${lang}_IMPLICIT_INCLUDE_DIRECTORIES_INIT with the
value returned by the parser
- CMakeDetermineCompilerABI.cmake always sets
CMAKE_${lang}_IMPLICIT_INCLUDE_DIRECTORIES to the above value
of _CMAKE_${lang}_IMPLICIT_INCLUDE_DIRECTORIES_INIT
- the final value of CMAKE_${lang}_IMPLICIT_INCLUDE_DIRECTORIES gets
saved to CMake${lang}Compiler.cmake when it is regenerated after
the compiler tests are done.
- CMakeDetermineCompilerABI.cmake is only executed the first time cmake
is run. Additional runs of cmake directly load the implicit include
path from the value saved in CMake${lang}Compiler.cmake (the parser
and _INIT variable are not used).
The above depends on UnixPaths.cmake being loaded to set the _INIT value
before CMakeDetermineCompilerABI.cmake runs the implicit include parser.
90 lines
2.6 KiB
CMake
90 lines
2.6 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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# Block multiple inclusion because "CMakeCInformation.cmake" includes
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# "Platform/${CMAKE_SYSTEM_NAME}" even though the generic module
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# "CMakeSystemSpecificInformation.cmake" already included it.
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# The extra inclusion is a work-around documented next to the include()
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# call, so this can be removed when the work-around is removed.
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if(__UNIX_PATHS_INCLUDED)
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return()
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endif()
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set(__UNIX_PATHS_INCLUDED 1)
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set(UNIX 1)
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# also add the install directory of the running cmake to the search directories
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# CMAKE_ROOT is CMAKE_INSTALL_PREFIX/share/cmake, so we need to go two levels up
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get_filename_component(_CMAKE_INSTALL_DIR "${CMAKE_ROOT}" PATH)
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get_filename_component(_CMAKE_INSTALL_DIR "${_CMAKE_INSTALL_DIR}" PATH)
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# List common installation prefixes. These will be used for all
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# search types.
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list(APPEND CMAKE_SYSTEM_PREFIX_PATH
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# Standard
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/usr/local /usr /
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# CMake install location
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"${_CMAKE_INSTALL_DIR}"
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)
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if (NOT CMAKE_FIND_NO_INSTALL_PREFIX)
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list(APPEND CMAKE_SYSTEM_PREFIX_PATH
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# Project install destination.
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"${CMAKE_INSTALL_PREFIX}"
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)
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if(CMAKE_STAGING_PREFIX)
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list(APPEND CMAKE_SYSTEM_PREFIX_PATH
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# User-supplied staging prefix.
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"${CMAKE_STAGING_PREFIX}"
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)
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endif()
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endif()
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# Non "standard" but common install prefixes
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list(APPEND CMAKE_SYSTEM_PREFIX_PATH
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/usr/X11R6
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/usr/pkg
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/opt
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)
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# List common include file locations not under the common prefixes.
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list(APPEND CMAKE_SYSTEM_INCLUDE_PATH
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# X11
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/usr/include/X11
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)
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list(APPEND CMAKE_SYSTEM_LIBRARY_PATH
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# X11
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/usr/lib/X11
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)
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list(APPEND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES
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/lib /lib32 /lib64 /usr/lib /usr/lib32 /usr/lib64
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)
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# Platform-wide directories to avoid adding via -I<dir>.
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list(APPEND CMAKE_PLATFORM_IMPLICIT_INCLUDE_DIRECTORIES
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/usr/include
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)
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# Default per-language values. These may be later replaced after
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# parsing the implicit directory information from compiler output.
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set(_CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES_INIT
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${CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES}
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/usr/include
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)
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set(_CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES_INIT
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${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES}
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/usr/include
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)
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set(_CMAKE_CUDA_IMPLICIT_INCLUDE_DIRECTORIES_INIT
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${CMAKE_CUDA_IMPLICIT_INCLUDE_DIRECTORIES}
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/usr/include
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)
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# Enable use of lib32 and lib64 search path variants by default.
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set_property(GLOBAL PROPERTY FIND_LIBRARY_USE_LIB32_PATHS TRUE)
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set_property(GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS TRUE)
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set_property(GLOBAL PROPERTY FIND_LIBRARY_USE_LIBX32_PATHS TRUE)
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