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#
# This module will locate the Fortran standard libraries so that a Fortran
# object or library can be linked against using a C/C++ compiler.
#
# After calling this module the following will be set:
# STANDARDFORTRAN_LIBRARIES : A list of libraries to link against
# StandardFortran_FOUND : True if we found the standard Fortran libraries
#
# Implemenation note. CMake provides a variable
# CMAKE_Fortran_IMPLICIT_LINK_LIBRARIES which is a list of all libraries a
# compiler implicitly links against. Unfortunately, at least for GNU, this
# list includes a lot of extra libraries that we don't necessarily want to
# link against (including both static and shared versions of libgcc). This is
# why we've hardcoded the list per compiler.
#
enable_language(Fortran)
include(FindPackageHandleStandardArgs)
if(CMAKE_Fortran_COMPILER_ID MATCHES "GNU")
set(STANDARDFORTRAN_LIBS gfortran)
elseif(CMAKE_Fortran_COMPILER_ID MATCHES "Intel")
set(STANDARDFORTRAN_LIBS ifcore)
elseif(CMAKE_Fortran_COMPILER_ID STREQUAL "LLVMFlang")
set(STANDARDFORTRAN_LIBS FortranRuntime FortranDecimal)
elseif(CMAKE_Fortran_COMPILER_ID MATCHES "Flang")
set(STANDARDFORTRAN_LIBS flang flangrti pgmath)
#CMAKE_Fortran_COMPILER_ID does not give "ArmFlang"
if(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")
set(STANDARDFORTRAN_LIBS armflang amath_a64fx)
endif()
else()
message(FATAL_ERROR "${CMAKE_Fortran_COMPILER_ID} is not yet supported by this module.")
endif()
foreach(STANDARDFORTRAN_LIB ${STANDARDFORTRAN_LIBS})
set(STANDARDFORTRAN_LIB_NAMES
lib${STANDARDFORTRAN_LIB}${CMAKE_SHARED_LIBRARY_SUFFIX} lib${STANDARDFORTRAN_LIB}.a)
find_library(${STANDARDFORTRAN_LIB}_LIBRARY
${STANDARDFORTRAN_LIB_NAMES}
HINTS ${CMAKE_Fortran_IMPLICIT_LINK_DIRECTORIES}
)
list(APPEND STANDARDFORTRAN_LIBRARIES ${${STANDARDFORTRAN_LIB}_LIBRARY})
endforeach()
find_package_handle_standard_args(StandardFortran DEFAULT_MSG
STANDARDFORTRAN_LIBRARIES)
set(STANDARDFORTRAN_FOUND ${StandardFortran_FOUND})
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