YangZhou
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#.rst:
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# FindGFortranLibs
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# --------
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# https://github.com/Argonne-National-Laboratory/PIPS/blob/master/cmake/Modules/FindGFortranLibs.cmake
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# https://enccs.github.io/cmake-workshop/cxx-fortran/
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#
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# Find gcc Fortran compiler & library paths
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#
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# The module defines the following variables:
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#
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# ::
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#
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#
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# GFORTRANLIBS_FOUND - true if system has gfortran
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# LIBGFORTRAN_LIBRARIES - path to libgfortran
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# LIBQUADMATH_LIBRARIES - path to libquadmath
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# GFORTRAN_LIBARIES_DIR - directory containing libgfortran, libquadmath
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# GFORTRAN_INCLUDE_DIR - directory containing gfortran/gcc headers
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# LIBGOMP_LIBRARIES - path to libgomp
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# LIBGOMP_INCLUDE_DIR - directory containing omp.h header
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# GFORTRAN_VERSION_STRING - version of gfortran found
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#
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set(CMAKE_REQUIRED_QUIET ${LIBIOMP_FIND_QUIETLY})
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if(NOT CMAKE_REQUIRED_QUIET)
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message(STATUS "Looking for gfortran related libraries...")
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endif()
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enable_language(Fortran)
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if(CMAKE_Fortran_COMPILER_ID MATCHES "GNU")
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# Basically, call "gfortran -v" to dump compiler info to the string
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# GFORTRAN_VERBOSE_STR, which will be used to get necessary paths
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message(STATUS "Extracting library and header information by calling 'gfortran -v'...")
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execute_process(COMMAND "${CMAKE_Fortran_COMPILER}" "-v" ERROR_VARIABLE
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GFORTRAN_VERBOSE_STR RESULT_VARIABLE FLAG)
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# For debugging
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message(STATUS "'gfortran -v' returned:")
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message(STATUS "${GFORTRAN_VERBOSE_STR}")
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# Detect gfortran version
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string(REGEX MATCH "gcc version [^\t\n ]+" GFORTRAN_VER_STR "${GFORTRAN_VERBOSE_STR}")
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string(REGEX REPLACE "gcc version ([^\t\n ]+)" "\\1" GFORTRAN_VERSION_STRING "${GFORTRAN_VER_STR}")
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message(STATUS "Detected gfortran version ${GFORTRAN_VERSION_STRING}")
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unset(GFORTRAN_VER_STR)
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set(MATCH_REGEX "[^\t\n ]+[\t\n ]+")
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set(REPLACE_REGEX "([^\t\n ]+)")
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# Find architecture for compiler
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string(REGEX MATCH "Target: [^\t\n ]+"
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GFORTRAN_ARCH_STR "${GFORTRAN_VERBOSE_STR}")
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message(STATUS "Architecture string: ${GFORTRAN_ARCH_STR}")
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string(REGEX REPLACE "Target: ([^\t\n ]+)" "\\1"
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GFORTRAN_ARCH "${GFORTRAN_ARCH_STR}")
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message(STATUS "Detected gfortran architecture: ${GFORTRAN_ARCH}")
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unset(GFORTRAN_ARCH_STR)
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# Find install prefix, if it exists; if not, use default
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string(REGEX MATCH "--prefix=[^\t\n ]+[\t\n ]+"
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GFORTRAN_PREFIX_STR "${GFORTRAN_VERBOSE_STR}")
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if(NOT GFORTRAN_PREFIX_STR)
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message(STATUS "Detected default gfortran prefix")
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set(GFORTRAN_PREFIX_DIR "/usr/local") # default prefix for gcc install
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else()
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string(REGEX REPLACE "--prefix=([^\t\n ]+)" "\\1"
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GFORTRAN_PREFIX_DIR "${GFORTRAN_PREFIX_STR}")
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endif()
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message(STATUS "Detected gfortran prefix: ${GFORTRAN_PREFIX_DIR}")
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unset(GFORTRAN_PREFIX_STR)
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# Find install exec-prefix, if it exists; if not, use default
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string(REGEX MATCH "--exec-prefix=[^\t\n ]+[\t\n ]+" "\\1"
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GFORTRAN_EXEC_PREFIX_STR "${GFORTRAN_VERBOSE_STR}")
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if(NOT GFORTRAN_EXEC_PREFIX_STR)
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message(STATUS "Detected default gfortran exec-prefix")
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set(GFORTRAN_EXEC_PREFIX_DIR "${GFORTRAN_PREFIX_DIR}")
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else()
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string(REGEX REPLACE "--exec-prefix=([^\t\n ]+)" "\\1"
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GFORTRAN_EXEC_PREFIX_DIR "${GFORTRAN_EXEC_PREFIX_STR}")
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endif()
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message(STATUS "Detected gfortran exec-prefix: ${GFORTRAN_EXEC_PREFIX_DIR}")
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UNSET(GFORTRAN_EXEC_PREFIX_STR)
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# Find library directory and include directory, if library directory specified
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string(REGEX MATCH "--libdir=[^\t\n ]+"
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GFORTRAN_LIB_DIR_STR "${GFORTRAN_VERBOSE_STR}")
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if(NOT GFORTRAN_LIB_DIR_STR)
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message(STATUS "Found --libdir flag -- not found")
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message(STATUS "Using default gfortran library & include directory paths")
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set(GFORTRAN_LIBRARIES_DIR
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"${GFORTRAN_EXEC_PREFIX_DIR}/lib/gcc/${GFORTRAN_ARCH}/${GFORTRAN_VERSION_STRING}")
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string(CONCAT GFORTRAN_INCLUDE_DIR "${GFORTRAN_LIBRARIES_DIR}" "/include")
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else()
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message(STATUS "Found --libdir flag -- yes")
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string(REGEX REPLACE "--libdir=([^\t\n ]+)" "\\1"
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GFORTRAN_LIBRARIES_DIR "${GFORTRAN_LIB_DIR_STR}")
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string(CONCAT GFORTRAN_INCLUDE_DIR "${GFORTRAN_LIBRARIES_DIR}" "/gcc/" "${GFORTRAN_ARCH}" "/" "${GFORTRAN_VERSION_STRING}" "/include")
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endif()
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message(STATUS "gfortran libraries path: ${GFORTRAN_LIBRARIES_DIR}")
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message(STATUS "gfortran include path dir: ${GFORTRAN_INCLUDE_DIR}")
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unset(GFORTRAN_LIB_DIR_STR)
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# There are lots of other build options for gcc & gfortran. For now, the
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# options implemented above should cover a lot of common use cases.
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# Clean up be deleting the output string from "gfortran -v"
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unset(GFORTRAN_VERBOSE_STR)
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# Find paths for libgfortran, libquadmath, libgomp
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# libgomp needed for OpenMP support without Clang
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find_library(LIBGFORTRAN_LIBRARIES NAMES gfortran libgfortran
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HINTS ${GFORTRAN_LIBRARIES_DIR})
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find_library(LIBQUADMATH_LIBRARIES NAMES quadmath libquadmath
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HINTS ${GFORTRAN_LIBRARIES_DIR})
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find_library(LIBGOMP_LIBRARIES NAMES gomp libgomp
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HINTS ${GFORTRAN_LIBRARIES_DIR})
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# Find OpenMP headers
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find_path(LIBGOMP_INCLUDE_DIR NAMES omp.h HINTS ${GFORTRAN_INCLUDE_DIR})
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else()
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message(STATUS "CMAKE_Fortran_COMPILER_ID does not match 'GNU'!")
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endif()
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include(FindPackageHandleStandardArgs)
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# Required: libgfortran, libquadmath, path for gfortran libraries
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# Optional: libgomp, path for OpenMP headers, path for gcc/gfortran headers
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find_package_handle_standard_args(GFortranLibs
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REQUIRED_VARS LIBGFORTRAN_LIBRARIES LIBQUADMATH_LIBRARIES GFORTRAN_LIBRARIES_DIR
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VERSION_VAR GFORTRAN_VERSION_STRING)
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if(GFORTRANLIBS_FOUND)
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message(STATUS "Looking for gfortran libraries -- found")
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message(STATUS "gfortran version: ${GFORTRAN_VERSION_STRING}")
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else()
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message(STATUS "Looking for gfortran libraries -- not found")
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endif()
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mark_as_advanced(LIBGFORTRAN_LIBRARIES LIBQUADMATH_LIBRARIES
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LIBGOMP_LIBRARIES LIBGOMP_INCLUDE_DIR
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GFORTRAN_LIBRARIES_DIR GFORTRAN_INCLUDE_DIR)
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# FindGFortranLIBS.cmake ends here
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