ENH: Implicit link info for C, CXX, and Fortran
This teaches CMake to detect implicit link information for C, C++, and Fortran compilers. We detect the implicit linker search directories and implicit linker options for UNIX-like environments using verbose output from compiler front-ends. We store results in new variables called CMAKE_<LANG>_IMPLICIT_LINK_LIBRARIES CMAKE_<LANG>_IMPLICIT_LINK_DIRECTORIES The implicit libraries can contain linker flags as well as library names.
This commit is contained in:
Brad King
parent
797e49a1cc
commit
07ea19ad1f
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@ -34,3 +34,6 @@ ENDIF(CMAKE_C_SIZEOF_DATA_PTR)
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IF(CMAKE_C_COMPILER_ABI)
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SET(CMAKE_INTERNAL_PLATFORM_ABI "${CMAKE_C_COMPILER_ABI}")
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ENDIF(CMAKE_C_COMPILER_ABI)
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SET(CMAKE_C_IMPLICIT_LINK_LIBRARIES "@CMAKE_C_IMPLICIT_LINK_LIBRARIES@")
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SET(CMAKE_C_IMPLICIT_LINK_DIRECTORIES "@CMAKE_C_IMPLICIT_LINK_DIRECTORIES@")
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@ -34,3 +34,6 @@ ENDIF(CMAKE_CXX_SIZEOF_DATA_PTR)
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IF(CMAKE_CXX_COMPILER_ABI)
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SET(CMAKE_INTERNAL_PLATFORM_ABI "${CMAKE_CXX_COMPILER_ABI}")
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ENDIF(CMAKE_CXX_COMPILER_ABI)
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SET(CMAKE_CXX_IMPLICIT_LINK_LIBRARIES "@CMAKE_CXX_IMPLICIT_LINK_LIBRARIES@")
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SET(CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES "@CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES@")
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@ -3,6 +3,8 @@
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# This is used internally by CMake and should not be included by user
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# code.
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INCLUDE(${CMAKE_ROOT}/Modules/CMakeParseImplicitLinkInfo.cmake)
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FUNCTION(CMAKE_DETERMINE_COMPILER_ABI lang src)
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IF(NOT DEFINED CMAKE_DETERMINE_${lang}_ABI_COMPILED)
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MESSAGE(STATUS "Detecting ${lang} compiler ABI info")
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@ -11,6 +13,8 @@ FUNCTION(CMAKE_DETERMINE_COMPILER_ABI lang src)
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SET(BIN "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeDetermineCompilerABI_${lang}.bin")
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TRY_COMPILE(CMAKE_DETERMINE_${lang}_ABI_COMPILED
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${CMAKE_BINARY_DIR} ${src}
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CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS=${CMAKE_${lang}_VERBOSE_FLAG}"
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"-DCMAKE_${lang}_STANDARD_LIBRARIES="
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OUTPUT_VARIABLE OUTPUT
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COPY_FILE "${BIN}"
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)
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@ -40,6 +44,15 @@ FUNCTION(CMAKE_DETERMINE_COMPILER_ABI lang src)
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SET(CMAKE_INTERNAL_PLATFORM_ABI "${ABI_NAME}" PARENT_SCOPE)
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ENDIF(ABI_NAME)
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# Parse implicit linker information for this language, if available.
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SET(implicit_dirs "")
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SET(implicit_libs "")
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IF(CMAKE_${lang}_VERBOSE_FLAG)
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CMAKE_PARSE_IMPLICIT_LINK_INFO("${OUTPUT}" implicit_libs implicit_dirs)
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ENDIF()
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SET(CMAKE_${lang}_IMPLICIT_LINK_LIBRARIES "${implicit_libs}" PARENT_SCOPE)
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SET(CMAKE_${lang}_IMPLICIT_LINK_DIRECTORIES "${implicit_dirs}" PARENT_SCOPE)
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ELSE(CMAKE_DETERMINE_${lang}_ABI_COMPILED)
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MESSAGE(STATUS "Detecting ${lang} compiler ABI info - failed")
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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@ -27,3 +27,6 @@ IF(UNIX)
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ELSE(UNIX)
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SET(CMAKE_Fortran_OUTPUT_EXTENSION .obj)
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ENDIF(UNIX)
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SET(CMAKE_Fortran_IMPLICIT_LINK_LIBRARIES "@CMAKE_Fortran_IMPLICIT_LINK_LIBRARIES@")
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SET(CMAKE_Fortran_IMPLICIT_LINK_DIRECTORIES "@CMAKE_Fortran_IMPLICIT_LINK_DIRECTORIES@")
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@ -0,0 +1,71 @@
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# Function parse implicit linker options.
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# This is used internally by CMake and should not be included by user
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# code.
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function(CMAKE_PARSE_IMPLICIT_LINK_INFO text lib_var dir_var)
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set(implicit_libs "")
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set(implicit_dirs_tmp)
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# Parse implicit linker arguments.
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set(linker "CMAKE_LINKER-NOTFOUND")
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if(CMAKE_LINKER)
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get_filename_component(linker ${CMAKE_LINKER} NAME)
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endif()
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set(linker_regex "/(${linker}|ld|collect2)")
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string(REGEX REPLACE "\r?\n" ";" output_lines "${text}")
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foreach(line IN LISTS output_lines)
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set(cmd)
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if("${line}" MATCHES "${linker_regex}")
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if(UNIX)
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separate_arguments(args UNIX_COMMAND "${line}")
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else()
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separate_arguments(args WINDOWS_COMMAND "${line}")
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endif()
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list(GET args 0 cmd)
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endif()
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if("${cmd}" MATCHES "${linker_regex}")
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string(REGEX REPLACE ";-([LY]);" ";-\\1" args "${args}")
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foreach(arg IN LISTS args)
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if("${arg}" MATCHES "^-L(.:)?[/\\]")
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# Unix search path.
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string(REGEX REPLACE "^-L" "" dir "${arg}")
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list(APPEND implicit_dirs_tmp ${dir})
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elseif("${arg}" MATCHES "^-l[^:]")
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# Unix library.
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string(REGEX REPLACE "^-l" "" lib "${arg}")
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list(APPEND implicit_libs ${lib})
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elseif("${arg}" MATCHES "^(.:)?[/\\].*\\.a$")
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# Unix library full path.
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list(APPEND implicit_libs ${arg})
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elseif("${arg}" MATCHES "^-Y(P,)?")
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# Sun search path.
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string(REGEX REPLACE "^-Y(P,)?" "" dirs "${arg}")
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string(REPLACE ":" ";" dirs "${dirs}")
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list(APPEND implicit_dirs_tmp ${dirs})
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elseif("${arg}" MATCHES "^-l:")
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# HP named library.
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list(APPEND implicit_libs ${arg})
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endif()
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endforeach()
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break()
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elseif("${line}" MATCHES "LPATH(=| is:? )")
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# HP search path.
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string(REGEX REPLACE ".*LPATH(=| is:? *)" "" paths "${line}")
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string(REPLACE ":" ";" paths "${paths}")
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list(APPEND implicit_dirs_tmp ${paths})
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endif()
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endforeach()
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# Cleanup list of directories.
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set(implicit_dirs "")
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foreach(d IN LISTS implicit_dirs_tmp)
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get_filename_component(dir "${d}" ABSOLUTE)
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list(APPEND implicit_dirs "${dir}")
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endforeach()
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list(REMOVE_DUPLICATES implicit_dirs)
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# Return results.
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set(${lib_var} "${implicit_libs}" PARENT_SCOPE)
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set(${dir_var} "${implicit_dirs}" PARENT_SCOPE)
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endfunction()
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@ -0,0 +1 @@
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SET(CMAKE_C_VERBOSE_FLAG "-v")
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@ -0,0 +1 @@
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SET(CMAKE_CXX_VERBOSE_FLAG "-v")
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@ -0,0 +1 @@
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SET(CMAKE_Fortran_VERBOSE_FLAG "-v")
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@ -0,0 +1 @@
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SET(CMAKE_C_VERBOSE_FLAG "-v")
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@ -0,0 +1 @@
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SET(CMAKE_CXX_VERBOSE_FLAG "-v")
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@ -0,0 +1 @@
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SET(CMAKE_Fortran_VERBOSE_FLAG "-v")
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@ -0,0 +1 @@
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SET(CMAKE_C_VERBOSE_FLAG "-v")
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@ -0,0 +1 @@
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SET(CMAKE_CXX_VERBOSE_FLAG "-v")
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@ -0,0 +1 @@
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SET(CMAKE_Fortran_VERBOSE_FLAG "-v")
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@ -0,0 +1 @@
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SET(CMAKE_C_VERBOSE_FLAG "-#")
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@ -0,0 +1 @@
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SET(CMAKE_CXX_VERBOSE_FLAG "-v")
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@ -0,0 +1 @@
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SET(CMAKE_Fortran_VERBOSE_FLAG "-v")
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@ -0,0 +1 @@
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SET(CMAKE_C_VERBOSE_FLAG "-V")
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@ -0,0 +1 @@
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SET(CMAKE_CXX_VERBOSE_FLAG "-V")
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@ -0,0 +1 @@
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SET(CMAKE_Fortran_VERBOSE_FLAG "-V")
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@ -1180,6 +1180,27 @@ void cmDocumentVariables::DefineVariables(cmake* cm)
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"include directories on some compilers.", false,
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"Variables for Languages");
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cm->DefineProperty
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("CMAKE_<LANG>_IMPLICIT_LINK_DIRECTORIES", cmProperty::VARIABLE,
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"Implicit linker search path detected for language <LANG>.",
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"Compilers typically pass directories containing language runtime "
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"libraries and default library search paths when they invoke a linker. "
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"These paths are implicit linker search directories for the compiler's "
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"language. "
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"CMake automatically detects these directories for each language and "
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"reports the results in this variable.", false,
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"Variables for Languages");
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cm->DefineProperty
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("CMAKE_<LANG>_IMPLICIT_LINK_LIBRARIES", cmProperty::VARIABLE,
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"Implicit link libraries and flags detected for language <LANG>.",
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"Compilers typically pass language runtime library names and "
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"other flags when they invoke a linker. "
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"These flags are implicit link options for the compiler's language. "
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"CMake automatically detects these libraries and flags for each "
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"language and reports the results in this variable.", false,
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"Variables for Languages");
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cm->DefineProperty
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("CMAKE_<LANG>_LINKER_PREFERENCE", cmProperty::VARIABLE,
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"Determine if a language should be used for linking.",
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@ -86,3 +86,10 @@ CMAKE_CXX_COMPILE_OBJECT == "${CMAKE_CXX_COMPILE_OBJECT}"
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CMAKE_C_COMPILE_OBJECT == "${CMAKE_C_COMPILE_OBJECT}"
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CMAKE_C_LINK_EXECUTABLE == "${CMAKE_C_LINK_EXECUTABLE}"
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CMAKE_CXX_LINK_EXECUTABLE == "${CMAKE_CXX_LINK_EXECUTABLE}"
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// implicit link info
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CMAKE_C_IMPLICIT_LINK_LIBRARIES == "${CMAKE_C_IMPLICIT_LINK_LIBRARIES}"
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CMAKE_C_IMPLICIT_LINK_DIRECTORIES == "${CMAKE_C_IMPLICIT_LINK_DIRECTORIES}"
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CMAKE_CXX_IMPLICIT_LINK_LIBRARIES == "${CMAKE_CXX_IMPLICIT_LINK_LIBRARIES}"
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CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES == "${CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES}"
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