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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
FindGSL
--------
.. versionadded:: 3.2
Find the native GNU Scientific Library (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. If available, the libraries
named ``gsld``, ``gslblasd`` or ``cblasd`` are recognized as debug libraries.
For Unix-like systems, this script will use ``$GSL_ROOT_DIR/bin/gsl-config``
(if found) to aid in the discovery of GSL.
Cache Variables
^^^^^^^^^^^^^^^
This module may set the following variables depending on platform and type
of GSL installation discovered. These variables may optionally be set to
help this module find the correct files::
GSL_CBLAS_LIBRARY - Location of the GSL CBLAS library.
GSL_CBLAS_LIBRARY_DEBUG - Location of the debug GSL CBLAS library (if any).
GSL_CONFIG_EXECUTABLE - Location of the ``gsl-config`` script (if any).
GSL_LIBRARY - Location of the GSL library.
GSL_LIBRARY_DEBUG - Location of the debug GSL library (if any).
#]=======================================================================]
include(${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 QUIET)
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 gsld gsl
HINTS ${GSL_ROOT_DIR}/lib ${GSL_LIBDIR}
PATH_SUFFIXES Debug
)
find_library( GSL_CBLAS_LIBRARY_DEBUG
NAMES gslcblasd cblasd 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 ".*define[ ]+GSL_VERSION[ ]+\"([^\"]*)\".*" "\\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()
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