Modules/FindGSL.cmake - third_party/cmake - Git at Google

 #.rst:
 # FindGSL
 # --------
 #
 # Find the native GSL includes and libraries.
 #
 # The GNU Scientific Library (GSL) is a numerical library for C and C++
 # programmers. It is free software under the GNU General Public
 # License.
 #
 # Imported Targets
 # ^^^^^^^^^^^^^^^^
 #
 # If GSL is found, this module defines the following :prop_tgt:`IMPORTED`
 # targets::
 #
 #  GSL::gsl      - The main GSL library.
 #  GSL::gslcblas - The CBLAS support library used by GSL.
 #
 # Result Variables
 # ^^^^^^^^^^^^^^^^
 #
 # This module will set the following variables in your project::
 #
 #  GSL_FOUND          - True if GSL found on the local system
 #  GSL_INCLUDE_DIRS   - Location of GSL header files.
 #  GSL_LIBRARIES      - The GSL libraries.
 #  GSL_VERSION        - The version of the discovered GSL install.
 #
 # Hints
 # ^^^^^
 #
 # Set ``GSL_ROOT_DIR`` to a directory that contains a GSL installation.
 #
 # This script expects to find libraries at ``$GSL_ROOT_DIR/lib`` and the GSL
 # headers at ``$GSL_ROOT_DIR/include/gsl``.  The library directory may
 # optionally provide Release and Debug folders.  For Unix-like systems, this
 # script will use ``$GSL_ROOT_DIR/bin/gsl-config`` (if found) to aid in the
 # discovery GSL.
 #
 # Cache Variables
 # ^^^^^^^^^^^^^^^
 #
 # This module may set the following variables depending on platform and type
 # of GSL installation discovered.  These variables may optionally be set to
 # help this module find the correct files::
 #
 #  GSL_CLBAS_LIBRARY       - Location of the GSL CBLAS library.
 #  GSL_CBLAS_LIBRARY_DEBUG - Location of the debug GSL CBLAS library (if any).
 #  GSL_CONFIG_EXECUTABLE   - Location of the ``gsl-config`` script (if any).
 #  GSL_LIBRARY             - Location of the GSL library.
 #  GSL_LIBRARY_DEBUG       - Location of the debug GSL library (if any).
 #

 #=============================================================================
 # Copyright 2014 Kelly Thompson <kgt@lanl.gov>
 #
 # Distributed under the OSI-approved BSD License (the "License");
 # see accompanying file Copyright.txt for details.
 #
 # This software is distributed WITHOUT ANY WARRANTY; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 # See the License for more information.
 #=============================================================================
 # (To distribute this file outside of CMake, substitute the full
 #  License text for the above reference.)

 # Include these modules to handle the QUIETLY and REQUIRED arguments.
 include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)

 #=============================================================================
 # If the user has provided ``GSL_ROOT_DIR``, use it!  Choose items found
 # at this location over system locations.
 if( EXISTS "$ENV{GSL_ROOT_DIR}" )
   file( TO_CMAKE_PATH "$ENV{GSL_ROOT_DIR}" GSL_ROOT_DIR )
   set( GSL_ROOT_DIR "${GSL_ROOT_DIR}" CACHE PATH "Prefix for GSL installation." )
 endif()
 if( NOT EXISTS "${GSL_ROOT_DIR}" )
   set( GSL_USE_PKGCONFIG ON )
 endif()

 #=============================================================================
 # As a first try, use the PkgConfig module.  This will work on many
 # *NIX systems.  See :module:`findpkgconfig`
 # This will return ``GSL_INCLUDEDIR`` and ``GSL_LIBDIR`` used below.
 if( GSL_USE_PKGCONFIG )
   find_package(PkgConfig)
   pkg_check_modules( GSL QUIET gsl )

   if( EXISTS "${GSL_INCLUDEDIR}" )
     get_filename_component( GSL_ROOT_DIR "${GSL_INCLUDEDIR}" DIRECTORY CACHE)
   endif()
 endif()

 #=============================================================================
 # Set GSL_INCLUDE_DIRS and GSL_LIBRARIES. If we skipped the PkgConfig step, try
 # to find the libraries at $GSL_ROOT_DIR (if provided) or in standard system
 # locations.  These find_library and find_path calls will prefer custom
 # locations over standard locations (HINTS).  If the requested file is not found
 # at the HINTS location, standard system locations will be still be searched
 # (/usr/lib64 (Redhat), lib/i386-linux-gnu (Debian)).

 find_path( GSL_INCLUDE_DIR
   NAMES gsl/gsl_sf.h
   HINTS ${GSL_ROOT_DIR}/include ${GSL_INCLUDEDIR}
 )
 find_library( GSL_LIBRARY
   NAMES gsl
   HINTS ${GSL_ROOT_DIR}/lib ${GSL_LIBDIR}
   PATH_SUFFIXES Release Debug
 )
 find_library( GSL_CBLAS_LIBRARY
   NAMES gslcblas cblas
   HINTS ${GSL_ROOT_DIR}/lib ${GSL_LIBDIR}
   PATH_SUFFIXES Release Debug
 )
 # Do we also have debug versions?
 find_library( GSL_LIBRARY_DEBUG
   NAMES gsl
   HINTS ${GSL_ROOT_DIR}/lib ${GSL_LIBDIR}
   PATH_SUFFIXES Debug
 )
 find_library( GSL_CBLAS_LIBRARY_DEBUG
   NAMES gslcblas cblas
   HINTS ${GSL_ROOT_DIR}/lib ${GSL_LIBDIR}
   PATH_SUFFIXES Debug
 )
 set( GSL_INCLUDE_DIRS ${GSL_INCLUDE_DIR} )
 set( GSL_LIBRARIES ${GSL_LIBRARY} ${GSL_CBLAS_LIBRARY} )

 # If we didn't use PkgConfig, try to find the version via gsl-config or by
 # reading gsl_version.h.
 if( NOT GSL_VERSION )
   # 1. If gsl-config exists, query for the version.
   find_program( GSL_CONFIG_EXECUTABLE
     NAMES gsl-config
     HINTS "${GSL_ROOT_DIR}/bin"
     )
   if( EXISTS "${GSL_CONFIG_EXECUTABLE}" )
     execute_process(
       COMMAND "${GSL_CONFIG_EXECUTABLE}" --version
       OUTPUT_VARIABLE GSL_VERSION
       OUTPUT_STRIP_TRAILING_WHITESPACE )
   endif()

   # 2. If gsl-config is not available, try looking in gsl/gsl_version.h
   if( NOT GSL_VERSION AND EXISTS "${GSL_INCLUDE_DIRS}/gsl/gsl_version.h" )
     file( STRINGS "${GSL_INCLUDE_DIRS}/gsl/gsl_version.h" gsl_version_h_contents REGEX "define GSL_VERSION" )
     string( REGEX REPLACE ".*([0-9].[0-9][0-9]).*" "\\1" GSL_VERSION ${gsl_version_h_contents} )
   endif()

   # might also try scraping the directory name for a regex match "gsl-X.X"
 endif()

 #=============================================================================
 # handle the QUIETLY and REQUIRED arguments and set GSL_FOUND to TRUE if all
 # listed variables are TRUE
 find_package_handle_standard_args( GSL
   FOUND_VAR
     GSL_FOUND
   REQUIRED_VARS
     GSL_INCLUDE_DIR
     GSL_LIBRARY
     GSL_CBLAS_LIBRARY
   VERSION_VAR
     GSL_VERSION
     )

 mark_as_advanced( GSL_ROOT_DIR GSL_VERSION GSL_LIBRARY GSL_INCLUDE_DIR
   GSL_CBLAS_LIBRARY GSL_LIBRARY_DEBUG GSL_CBLAS_LIBRARY_DEBUG
   GSL_USE_PKGCONFIG GSL_CONFIG )

 #=============================================================================
 # Register imported libraries:
 # 1. If we can find a Windows .dll file (or if we can find both Debug and
 #    Release libraries), we will set appropriate target properties for these.
 # 2. However, for most systems, we will only register the import location and
 #    include directory.

 # Look for dlls, or Release and Debug libraries.
 if(WIN32)
   string( REPLACE ".lib" ".dll" GSL_LIBRARY_DLL       "${GSL_LIBRARY}" )
   string( REPLACE ".lib" ".dll" GSL_CBLAS_LIBRARY_DLL "${GSL_CBLAS_LIBRARY}" )
   string( REPLACE ".lib" ".dll" GSL_LIBRARY_DEBUG_DLL "${GSL_LIBRARY_DEBUG}" )
   string( REPLACE ".lib" ".dll" GSL_CBLAS_LIBRARY_DEBUG_DLL "${GSL_CBLAS_LIBRARY_DEBUG}" )
 endif()

 if( GSL_FOUND AND NOT TARGET GSL::gsl )
   if( EXISTS "${GSL_LIBRARY_DLL}" AND EXISTS "${GSL_CBLAS_LIBRARY_DLL}")

     # Windows systems with dll libraries.
     add_library( GSL::gsl      SHARED IMPORTED )
     add_library( GSL::gslcblas SHARED IMPORTED )

     # Windows with dlls, but only Release libraries.
     set_target_properties( GSL::gslcblas PROPERTIES
       IMPORTED_LOCATION_RELEASE         "${GSL_CBLAS_LIBRARY_DLL}"
       IMPORTED_IMPLIB                   "${GSL_CBLAS_LIBRARY}"
       INTERFACE_INCLUDE_DIRECTORIES     "${GSL_INCLUDE_DIRS}"
       IMPORTED_CONFIGURATIONS           Release
       IMPORTED_LINK_INTERFACE_LANGUAGES "C" )
     set_target_properties( GSL::gsl PROPERTIES
       IMPORTED_LOCATION_RELEASE         "${GSL_LIBRARY_DLL}"
       IMPORTED_IMPLIB                   "${GSL_LIBRARY}"
       INTERFACE_INCLUDE_DIRECTORIES     "${GSL_INCLUDE_DIRS}"
       IMPORTED_CONFIGURATIONS           Release
       IMPORTED_LINK_INTERFACE_LANGUAGES "C"
       INTERFACE_LINK_LIBRARIES          GSL::gslcblas )

     # If we have both Debug and Release libraries
     if( EXISTS "${GSL_LIBRARY_DEBUG_DLL}" AND EXISTS "${GSL_CBLAS_LIBRARY_DEBUG_DLL}")
       set_property( TARGET GSL::gslcblas APPEND PROPERTY IMPORTED_CONFIGURATIONS Debug )
       set_target_properties( GSL::gslcblas PROPERTIES
         IMPORTED_LOCATION_DEBUG           "${GSL_CBLAS_LIBRARY_DEBUG_DLL}"
         IMPORTED_IMPLIB_DEBUG             "${GSL_CBLAS_LIBRARY_DEBUG}" )
       set_property( TARGET GSL::gsl APPEND PROPERTY IMPORTED_CONFIGURATIONS Debug )
       set_target_properties( GSL::gsl PROPERTIES
         IMPORTED_LOCATION_DEBUG           "${GSL_LIBRARY_DEBUG_DLL}"
         IMPORTED_IMPLIB_DEBUG             "${GSL_LIBRARY_DEBUG}" )
     endif()

   else()

     # For all other environments (ones without dll libraries), create
     # the imported library targets.
     add_library( GSL::gsl      UNKNOWN IMPORTED )
     add_library( GSL::gslcblas UNKNOWN IMPORTED )
     set_target_properties( GSL::gslcblas PROPERTIES
       IMPORTED_LOCATION                 "${GSL_CBLAS_LIBRARY}"
       INTERFACE_INCLUDE_DIRECTORIES     "${GSL_INCLUDE_DIRS}"
       IMPORTED_LINK_INTERFACE_LANGUAGES "C" )
     set_target_properties( GSL::gsl PROPERTIES
       IMPORTED_LOCATION                 "${GSL_LIBRARY}"
       INTERFACE_INCLUDE_DIRECTORIES     "${GSL_INCLUDE_DIRS}"
       IMPORTED_LINK_INTERFACE_LANGUAGES "C"
       INTERFACE_LINK_LIBRARIES          GSL::gslcblas )
   endif()
 endif()
	#.rst:
	# FindGSL
	# --------
	#
	# Find the native GSL includes and libraries.
	#
	# The GNU Scientific Library (GSL) is a numerical library for C and C++
	# programmers. It is free software under the GNU General Public
	# License.
	#
	# Imported Targets
	# ^^^^^^^^^^^^^^^^
	#
	# If GSL is found, this module defines the following :prop_tgt:`IMPORTED`
	# targets::
	#
	# GSL::gsl - The main GSL library.
	# GSL::gslcblas - The CBLAS support library used by GSL.
	#
	# Result Variables
	# ^^^^^^^^^^^^^^^^
	#
	# This module will set the following variables in your project::
	#
	# GSL_FOUND - True if GSL found on the local system
	# GSL_INCLUDE_DIRS - Location of GSL header files.
	# GSL_LIBRARIES - The GSL libraries.
	# GSL_VERSION - The version of the discovered GSL install.
	#
	# Hints
	# ^^^^^
	#
	# Set ``GSL_ROOT_DIR`` to a directory that contains a GSL installation.
	#
	# This script expects to find libraries at ``$GSL_ROOT_DIR/lib`` and the GSL
	# headers at ``$GSL_ROOT_DIR/include/gsl``. The library directory may
	# optionally provide Release and Debug folders. For Unix-like systems, this
	# script will use ``$GSL_ROOT_DIR/bin/gsl-config`` (if found) to aid in the
	# discovery GSL.
	#
	# Cache Variables
	# ^^^^^^^^^^^^^^^
	#
	# This module may set the following variables depending on platform and type
	# of GSL installation discovered. These variables may optionally be set to
	# help this module find the correct files::
	#
	# GSL_CLBAS_LIBRARY - Location of the GSL CBLAS library.
	# GSL_CBLAS_LIBRARY_DEBUG - Location of the debug GSL CBLAS library (if any).
	# GSL_CONFIG_EXECUTABLE - Location of the ``gsl-config`` script (if any).
	# GSL_LIBRARY - Location of the GSL library.
	# GSL_LIBRARY_DEBUG - Location of the debug GSL library (if any).
	#

	#=============================================================================
	# Copyright 2014 Kelly Thompson <kgt@lanl.gov>
	#
	# Distributed under the OSI-approved BSD License (the "License");
	# see accompanying file Copyright.txt for details.
	#
	# This software is distributed WITHOUT ANY WARRANTY; without even the
	# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	# See the License for more information.
	#=============================================================================
	# (To distribute this file outside of CMake, substitute the full
	# License text for the above reference.)

	# Include these modules to handle the QUIETLY and REQUIRED arguments.
	include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)

	#=============================================================================
	# If the user has provided ``GSL_ROOT_DIR``, use it! Choose items found
	# at this location over system locations.
	if( EXISTS "$ENV{GSL_ROOT_DIR}" )
	file( TO_CMAKE_PATH "$ENV{GSL_ROOT_DIR}" GSL_ROOT_DIR )
	set( GSL_ROOT_DIR "${GSL_ROOT_DIR}" CACHE PATH "Prefix for GSL installation." )
	endif()
	if( NOT EXISTS "${GSL_ROOT_DIR}" )
	set( GSL_USE_PKGCONFIG ON )
	endif()

	#=============================================================================
	# As a first try, use the PkgConfig module. This will work on many
	# *NIX systems. See :module:`findpkgconfig`
	# This will return ``GSL_INCLUDEDIR`` and ``GSL_LIBDIR`` used below.
	if( GSL_USE_PKGCONFIG )
	find_package(PkgConfig)
	pkg_check_modules( GSL QUIET gsl )

	if( EXISTS "${GSL_INCLUDEDIR}" )
	get_filename_component( GSL_ROOT_DIR "${GSL_INCLUDEDIR}" DIRECTORY CACHE)
	endif()
	endif()

	#=============================================================================
	# Set GSL_INCLUDE_DIRS and GSL_LIBRARIES. If we skipped the PkgConfig step, try
	# to find the libraries at $GSL_ROOT_DIR (if provided) or in standard system
	# locations. These find_library and find_path calls will prefer custom
	# locations over standard locations (HINTS). If the requested file is not found
	# at the HINTS location, standard system locations will be still be searched
	# (/usr/lib64 (Redhat), lib/i386-linux-gnu (Debian)).

	find_path( GSL_INCLUDE_DIR
	NAMES gsl/gsl_sf.h
	HINTS ${GSL_ROOT_DIR}/include ${GSL_INCLUDEDIR}
	)
	find_library( GSL_LIBRARY
	NAMES gsl
	HINTS ${GSL_ROOT_DIR}/lib ${GSL_LIBDIR}
	PATH_SUFFIXES Release Debug
	)
	find_library( GSL_CBLAS_LIBRARY
	NAMES gslcblas cblas
	HINTS ${GSL_ROOT_DIR}/lib ${GSL_LIBDIR}
	PATH_SUFFIXES Release Debug
	)
	# Do we also have debug versions?
	find_library( GSL_LIBRARY_DEBUG
	NAMES gsl
	HINTS ${GSL_ROOT_DIR}/lib ${GSL_LIBDIR}
	PATH_SUFFIXES Debug
	)
	find_library( GSL_CBLAS_LIBRARY_DEBUG
	NAMES gslcblas cblas
	HINTS ${GSL_ROOT_DIR}/lib ${GSL_LIBDIR}
	PATH_SUFFIXES Debug
	)
	set( GSL_INCLUDE_DIRS ${GSL_INCLUDE_DIR} )
	set( GSL_LIBRARIES ${GSL_LIBRARY} ${GSL_CBLAS_LIBRARY} )

	# If we didn't use PkgConfig, try to find the version via gsl-config or by
	# reading gsl_version.h.
	if( NOT GSL_VERSION )
	# 1. If gsl-config exists, query for the version.
	find_program( GSL_CONFIG_EXECUTABLE
	NAMES gsl-config
	HINTS "${GSL_ROOT_DIR}/bin"
	)
	if( EXISTS "${GSL_CONFIG_EXECUTABLE}" )
	execute_process(
	COMMAND "${GSL_CONFIG_EXECUTABLE}" --version
	OUTPUT_VARIABLE GSL_VERSION
	OUTPUT_STRIP_TRAILING_WHITESPACE )
	endif()

	# 2. If gsl-config is not available, try looking in gsl/gsl_version.h
	if( NOT GSL_VERSION AND EXISTS "${GSL_INCLUDE_DIRS}/gsl/gsl_version.h" )
	file( STRINGS "${GSL_INCLUDE_DIRS}/gsl/gsl_version.h" gsl_version_h_contents REGEX "define GSL_VERSION" )
	string( REGEX REPLACE ".([0-9].[0-9][0-9])." "\\1" GSL_VERSION ${gsl_version_h_contents} )
	endif()

	# might also try scraping the directory name for a regex match "gsl-X.X"
	endif()

	#=============================================================================
	# handle the QUIETLY and REQUIRED arguments and set GSL_FOUND to TRUE if all
	# listed variables are TRUE
	find_package_handle_standard_args( GSL
	FOUND_VAR
	GSL_FOUND
	REQUIRED_VARS
	GSL_INCLUDE_DIR
	GSL_LIBRARY
	GSL_CBLAS_LIBRARY
	VERSION_VAR
	GSL_VERSION
	)

	mark_as_advanced( GSL_ROOT_DIR GSL_VERSION GSL_LIBRARY GSL_INCLUDE_DIR
	GSL_CBLAS_LIBRARY GSL_LIBRARY_DEBUG GSL_CBLAS_LIBRARY_DEBUG
	GSL_USE_PKGCONFIG GSL_CONFIG )

	#=============================================================================
	# Register imported libraries:
	# 1. If we can find a Windows .dll file (or if we can find both Debug and
	# Release libraries), we will set appropriate target properties for these.
	# 2. However, for most systems, we will only register the import location and
	# include directory.

	# Look for dlls, or Release and Debug libraries.
	if(WIN32)
	string( REPLACE ".lib" ".dll" GSL_LIBRARY_DLL "${GSL_LIBRARY}" )
	string( REPLACE ".lib" ".dll" GSL_CBLAS_LIBRARY_DLL "${GSL_CBLAS_LIBRARY}" )
	string( REPLACE ".lib" ".dll" GSL_LIBRARY_DEBUG_DLL "${GSL_LIBRARY_DEBUG}" )
	string( REPLACE ".lib" ".dll" GSL_CBLAS_LIBRARY_DEBUG_DLL "${GSL_CBLAS_LIBRARY_DEBUG}" )
	endif()

	if( GSL_FOUND AND NOT TARGET GSL::gsl )
	if( EXISTS "${GSL_LIBRARY_DLL}" AND EXISTS "${GSL_CBLAS_LIBRARY_DLL}")

	# Windows systems with dll libraries.
	add_library( GSL::gsl SHARED IMPORTED )
	add_library( GSL::gslcblas SHARED IMPORTED )

	# Windows with dlls, but only Release libraries.
	set_target_properties( GSL::gslcblas PROPERTIES
	IMPORTED_LOCATION_RELEASE "${GSL_CBLAS_LIBRARY_DLL}"
	IMPORTED_IMPLIB "${GSL_CBLAS_LIBRARY}"
	INTERFACE_INCLUDE_DIRECTORIES "${GSL_INCLUDE_DIRS}"
	IMPORTED_CONFIGURATIONS Release
	IMPORTED_LINK_INTERFACE_LANGUAGES "C" )
	set_target_properties( GSL::gsl PROPERTIES
	IMPORTED_LOCATION_RELEASE "${GSL_LIBRARY_DLL}"
	IMPORTED_IMPLIB "${GSL_LIBRARY}"
	INTERFACE_INCLUDE_DIRECTORIES "${GSL_INCLUDE_DIRS}"
	IMPORTED_CONFIGURATIONS Release
	IMPORTED_LINK_INTERFACE_LANGUAGES "C"
	INTERFACE_LINK_LIBRARIES GSL::gslcblas )

	# If we have both Debug and Release libraries
	if( EXISTS "${GSL_LIBRARY_DEBUG_DLL}" AND EXISTS "${GSL_CBLAS_LIBRARY_DEBUG_DLL}")
	set_property( TARGET GSL::gslcblas APPEND PROPERTY IMPORTED_CONFIGURATIONS Debug )
	set_target_properties( GSL::gslcblas PROPERTIES
	IMPORTED_LOCATION_DEBUG "${GSL_CBLAS_LIBRARY_DEBUG_DLL}"
	IMPORTED_IMPLIB_DEBUG "${GSL_CBLAS_LIBRARY_DEBUG}" )
	set_property( TARGET GSL::gsl APPEND PROPERTY IMPORTED_CONFIGURATIONS Debug )
	set_target_properties( GSL::gsl PROPERTIES
	IMPORTED_LOCATION_DEBUG "${GSL_LIBRARY_DEBUG_DLL}"
	IMPORTED_IMPLIB_DEBUG "${GSL_LIBRARY_DEBUG}" )
	endif()

	else()

	# For all other environments (ones without dll libraries), create
	# the imported library targets.
	add_library( GSL::gsl UNKNOWN IMPORTED )
	add_library( GSL::gslcblas UNKNOWN IMPORTED )
	set_target_properties( GSL::gslcblas PROPERTIES
	IMPORTED_LOCATION "${GSL_CBLAS_LIBRARY}"
	INTERFACE_INCLUDE_DIRECTORIES "${GSL_INCLUDE_DIRS}"
	IMPORTED_LINK_INTERFACE_LANGUAGES "C" )
	set_target_properties( GSL::gsl PROPERTIES
	IMPORTED_LOCATION "${GSL_LIBRARY}"
	INTERFACE_INCLUDE_DIRECTORIES "${GSL_INCLUDE_DIRS}"
	IMPORTED_LINK_INTERFACE_LANGUAGES "C"
	INTERFACE_LINK_LIBRARIES GSL::gslcblas )
	endif()
	endif()