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#######################################################################
# Find the library for SWIG
#
# The goal here is to intercept calls to "FIND_PACKAGE(SWIG)" in order
# to do a global version check locally after passing on the "find" to
# SWIG-provided scripts.
########################################################################
# make this file non-reentrant within the current context
if(__INCLUDED_FIND_SWIG_CMAKE)
return()
endif()
set(__INCLUDED_FIND_SWIG_CMAKE TRUE)
# some status messages
message(STATUS "")
message(STATUS "Checking for module SWIG")
#
# First check to see if SWIG installed its own CMake file, or if the
# one provided by CMake finds SWIG.
#
# save the current MODULE path
set(SAVED_CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH})
# clear the current MODULE path; uses system paths only
unset(CMAKE_MODULE_PATH)
# try to find SWIG via the provided parameters,
# handle REQUIRED internally later
unset(SWIG_FOUND)
# was the version specified?
unset(LOCAL_SWIG_FIND_VERSION)
if(SWIG_FIND_VERSION)
set(LOCAL_SWIG_FIND_VERSION ${SWIG_FIND_VERSION})
endif(SWIG_FIND_VERSION)
# was EXACT specified?
unset(LOCAL_SWIG_FIND_VERSION_EXACT)
if(SWIG_FIND_VERSION_EXACT)
set(LOCAL_SWIG_FIND_VERSION_EXACT "EXACT")
endif(SWIG_FIND_VERSION_EXACT)
# was REQUIRED specified?
unset(LOCAL_SWIG_FIND_REQUIRED)
if(SWIG_FIND_REQUIRED)
set(LOCAL_SWIG_FIND_REQUIRED "REQUIRED")
endif(SWIG_FIND_REQUIRED)
# try to find SWIG using the provided parameters, quietly;
#
# this call will error out internally (and not quietly) if:
# 1: EXACT is specified and the version found does not match the requested version;
# 2: REQUIRED is set and SWIG was not found;
#
# this call will return SWIG_FOUND == FALSE if REQUIRED is not set, and:
# 1: SWIG was not found;
# 2: The version found is less than the requested version.
find_package(
SWIG
${LOCAL_SWIG_FIND_VERSION}
${LOCAL_SWIG_FIND_VERSION_EXACT}
${LOCAL_SWIG_FIND_REQUIRED}
QUIET
)
# restore CMAKE_MODULE_PATH
set(CMAKE_MODULE_PATH ${SAVED_CMAKE_MODULE_PATH})
# specific version checks
set(SWIG_VERSION_CHECK FALSE)
if(SWIG_FOUND)
# SWIG was found; make sure the version meets GR's needs
message(STATUS "Found SWIG version ${SWIG_VERSION}.")
if("${SWIG_VERSION}" VERSION_GREATER "1.3.30")
if(NOT "${SWIG_VERSION}" VERSION_EQUAL "3.0.3" AND
NOT "${SWIG_VERSION}" VERSION_EQUAL "3.0.4")
set(SWIG_VERSION_CHECK TRUE)
else()
message(STATUS "SWIG versions 3.0.3 and 3.0.4 fail to work with GNU Radio.")
endif()
else()
message(STATUS "Minimum SWIG version required is 1.3.31 for GNU Radio.")
endif()
else()
# SWIG was either not found, or is less than the requested version
if(SWIG_VERSION)
# SWIG_VERSION is set, but SWIG_FOUND is false; probably a version mismatch
message(STATUS "Found SWIG version ${SWIG_VERSION}.")
message(STATUS "Requested SWIG version is at least ${SWIG_FIND_VERSION}.")
endif()
endif()
# did the version check fail?
if(NOT SWIG_VERSION_CHECK)
# yes: clear various variables and set FOUND to FALSE
message(STATUS "Disabling SWIG because version check failed.")
unset(SWIG_VERSION CACHE)
unset(SWIG_DIR CACHE)
unset(SWIG_EXECUTABLE CACHE)
set(SWIG_FOUND FALSE CACHE BOOL "Set to TRUE if a compatible version of SWIG is found" FORCE)
endif()
# check to see if SWIG variables were set
if(SWIG_FOUND AND SWIG_DIR AND SWIG_EXECUTABLE)
# yes: even if set SWIG_FOUND==TRUE, then these have already been
# done, but done quietly. It does not hurt to redo them here.
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(SWIG DEFAULT_MSG SWIG_EXECUTABLE SWIG_DIR)
mark_as_advanced(SWIG_EXECUTABLE SWIG_DIR)
elseif(SWIG_FIND_REQUIRED)
if(SWIG_FIND_VERSION)
message(FATAL_ERROR "The found SWIG version (${SWIG_VERSION}) is not compatible with the version required (${SWIG_FIND_VERSION}).")
else()
message(FATAL_ERROR "SWIG is required, but was not found.")
endif()
endif()
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