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e01990999a
On Windows, toolchains like MSVC require a set of environment variables to be configured for the compiler to work correctly. The scripts that prepare these environments typically put the compiler's directory ahead of others in the `PATH`. Teach the Ninja generators to use this as a heuristic to select the compiler when none is explicitly specified. This is not necessary with Makefile generators because each toolchain's environment comes with its own make tool variant, and the corresponding Makefile generator (e.g. "NMake Makefiles") automatically implies the matching compiler. Fixes: #20585
150 lines
6.0 KiB
CMake
150 lines
6.0 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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macro(_cmake_find_compiler lang)
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# Use already-enabled languages for reference.
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get_property(_languages GLOBAL PROPERTY ENABLED_LANGUAGES)
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list(REMOVE_ITEM _languages "${lang}")
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if(CMAKE_${lang}_COMPILER_INIT)
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# Search only for the specified compiler.
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set(CMAKE_${lang}_COMPILER_LIST "${CMAKE_${lang}_COMPILER_INIT}")
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else()
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# Re-order the compiler list with preferred vendors first.
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set(_${lang}_COMPILER_LIST "${CMAKE_${lang}_COMPILER_LIST}")
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set(CMAKE_${lang}_COMPILER_LIST "")
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# Prefer vendors of compilers from reference languages.
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foreach(l ${_languages})
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list(APPEND CMAKE_${lang}_COMPILER_LIST
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${_${lang}_COMPILER_NAMES_${CMAKE_${l}_COMPILER_ID}})
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endforeach()
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# Prefer vendors based on the platform.
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list(APPEND CMAKE_${lang}_COMPILER_LIST ${CMAKE_${lang}_COMPILER_NAMES})
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# Append the rest of the list and remove duplicates.
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list(APPEND CMAKE_${lang}_COMPILER_LIST ${_${lang}_COMPILER_LIST})
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unset(_${lang}_COMPILER_LIST)
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list(REMOVE_DUPLICATES CMAKE_${lang}_COMPILER_LIST)
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if(CMAKE_${lang}_COMPILER_EXCLUDE)
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list(REMOVE_ITEM CMAKE_${lang}_COMPILER_LIST
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${CMAKE_${lang}_COMPILER_EXCLUDE})
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endif()
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endif()
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# Look for directories containing compilers of reference languages.
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set(_${lang}_COMPILER_HINTS)
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foreach(l ${_languages})
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if(CMAKE_${l}_COMPILER AND IS_ABSOLUTE "${CMAKE_${l}_COMPILER}")
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get_filename_component(_hint "${CMAKE_${l}_COMPILER}" PATH)
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if(IS_DIRECTORY "${_hint}")
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list(APPEND _${lang}_COMPILER_HINTS "${_hint}")
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endif()
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unset(_hint)
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endif()
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endforeach()
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# Find the compiler.
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if(_${lang}_COMPILER_HINTS)
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# Prefer directories containing compilers of reference languages.
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list(REMOVE_DUPLICATES _${lang}_COMPILER_HINTS)
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find_program(CMAKE_${lang}_COMPILER
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NAMES ${CMAKE_${lang}_COMPILER_LIST}
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PATHS ${_${lang}_COMPILER_HINTS}
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NO_DEFAULT_PATH
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DOC "${lang} compiler")
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endif()
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if(CMAKE_HOST_WIN32 AND CMAKE_GENERATOR MATCHES "Ninja")
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# On Windows command-line builds, the Makefile generators each imply
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# a preferred compiler tool. The Ninja generator does not imply a
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# compiler tool, so use the compiler that occurs first in PATH.
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find_program(CMAKE_${lang}_COMPILER
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NAMES ${CMAKE_${lang}_COMPILER_LIST}
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NAMES_PER_DIR
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DOC "${lang} compiler"
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NO_PACKAGE_ROOT_PATH
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NO_CMAKE_PATH
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NO_CMAKE_ENVIRONMENT_PATH
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NO_CMAKE_SYSTEM_PATH
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)
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endif()
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find_program(CMAKE_${lang}_COMPILER NAMES ${CMAKE_${lang}_COMPILER_LIST} DOC "${lang} compiler")
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if(CMAKE_${lang}_COMPILER_INIT AND NOT CMAKE_${lang}_COMPILER)
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set_property(CACHE CMAKE_${lang}_COMPILER PROPERTY VALUE "${CMAKE_${lang}_COMPILER_INIT}")
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endif()
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unset(_${lang}_COMPILER_HINTS)
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unset(_languages)
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# Look for a make tool provided by Xcode
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if(CMAKE_HOST_APPLE)
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macro(_query_xcrun compiler_name result_var_keyword result_var)
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if(NOT "x${result_var_keyword}" STREQUAL "xRESULT_VAR")
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message(FATAL_ERROR "Bad arguments to macro")
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endif()
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execute_process(COMMAND xcrun --find ${compiler_name}
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OUTPUT_VARIABLE _xcrun_out OUTPUT_STRIP_TRAILING_WHITESPACE
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ERROR_VARIABLE _xcrun_err)
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set("${result_var}" "${_xcrun_out}")
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endmacro()
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set(xcrun_result)
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if (CMAKE_${lang}_COMPILER MATCHES "^/usr/bin/(.+)$")
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_query_xcrun("${CMAKE_MATCH_1}" RESULT_VAR xcrun_result)
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elseif (CMAKE_${lang}_COMPILER STREQUAL "CMAKE_${lang}_COMPILER-NOTFOUND")
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foreach(comp ${CMAKE_${lang}_COMPILER_LIST})
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_query_xcrun("${comp}" RESULT_VAR xcrun_result)
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if(xcrun_result)
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break()
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endif()
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endforeach()
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endif()
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if (xcrun_result)
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set_property(CACHE CMAKE_${lang}_COMPILER PROPERTY VALUE "${xcrun_result}")
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endif()
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endif()
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endmacro()
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macro(_cmake_find_compiler_path lang)
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if(CMAKE_${lang}_COMPILER)
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# we only get here if CMAKE_${lang}_COMPILER was specified using -D or a pre-made CMakeCache.txt
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# (e.g. via ctest) or set in CMAKE_TOOLCHAIN_FILE
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# if CMAKE_${lang}_COMPILER is a list of length 2, use the first item as
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# CMAKE_${lang}_COMPILER and the 2nd one as CMAKE_${lang}_COMPILER_ARG1
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list(LENGTH CMAKE_${lang}_COMPILER _CMAKE_${lang}_COMPILER_LIST_LENGTH)
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if("${_CMAKE_${lang}_COMPILER_LIST_LENGTH}" EQUAL 2)
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list(GET CMAKE_${lang}_COMPILER 1 CMAKE_${lang}_COMPILER_ARG1)
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list(GET CMAKE_${lang}_COMPILER 0 CMAKE_${lang}_COMPILER)
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endif()
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unset(_CMAKE_${lang}_COMPILER_LIST_LENGTH)
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# find the compiler in the PATH if necessary
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get_filename_component(_CMAKE_USER_${lang}_COMPILER_PATH "${CMAKE_${lang}_COMPILER}" PATH)
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if(NOT _CMAKE_USER_${lang}_COMPILER_PATH)
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find_program(CMAKE_${lang}_COMPILER_WITH_PATH NAMES ${CMAKE_${lang}_COMPILER})
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if(CMAKE_${lang}_COMPILER_WITH_PATH)
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set(CMAKE_${lang}_COMPILER ${CMAKE_${lang}_COMPILER_WITH_PATH})
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get_property(_CMAKE_${lang}_COMPILER_CACHED CACHE CMAKE_${lang}_COMPILER PROPERTY TYPE)
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if(_CMAKE_${lang}_COMPILER_CACHED)
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set(CMAKE_${lang}_COMPILER "${CMAKE_${lang}_COMPILER}" CACHE STRING "${lang} compiler" FORCE)
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endif()
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unset(_CMAKE_${lang}_COMPILER_CACHED)
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endif()
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unset(CMAKE_${lang}_COMPILER_WITH_PATH CACHE)
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endif()
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endif()
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endmacro()
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function(_cmake_find_compiler_sysroot lang)
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if(CMAKE_${lang}_COMPILER_ID STREQUAL "GNU")
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execute_process(COMMAND "${CMAKE_${lang}_COMPILER}" -print-sysroot
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OUTPUT_STRIP_TRAILING_WHITESPACE
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OUTPUT_VARIABLE _cmake_sysroot_run_out
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ERROR_VARIABLE _cmake_sysroot_run_err)
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if(_cmake_sysroot_run_out AND NOT _cmake_sysroot_run_err AND IS_DIRECTORY "${_cmake_sysroot_run_out}/usr")
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set(CMAKE_${lang}_COMPILER_SYSROOT "${_cmake_sysroot_run_out}/usr" PARENT_SCOPE)
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else()
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set(CMAKE_${lang}_COMPILER_SYSROOT "" PARENT_SCOPE)
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endif()
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endif()
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endfunction()
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