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#===============================================================================
# Copyright (C) 2017 Open Source Robotics Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
########################################
# Find libdl
if(MSVC)
# The dlfcn-win32 library installs a config module, so we should leverage that
find_package(dlfcn-win32)
# Note: Ideally, we would create an alias target for dlfcn-win32::dl, but
# cmake does not (currently) support aliasing imported targets
# (see: https://gitlab.kitware.com/cmake/cmake/issues/15569)
#
# For now, we will use a variable named DL_TARGET for linking, even though
# it is old-fashioned. If a day comes when cmake supported aliasing
# imported targets, then we should migrate to something like
#
# add_library(DL::DL ALIAS dlfcn-win32::dl)
#
# And then link to DL::DL.
set(DL_TARGET dlfcn-win32::dl)
if(dlfcn-win32_FOUND)
set(DL_FOUND true)
else()
set(DL_FOUND false)
endif()
else()
# NOTE: libdl is a system library on UNIX, so it does not come with pkgconfig metadata
# If we cannot find the header or the library, we will switch this to false
set(DL_FOUND true)
# Search for the header
find_path(DL_INCLUDE_DIRS dlfcn.h)
if(DL_INCLUDE_DIRS)
if(NOT DL_FIND_QUIETLY)
message(STATUS "Looking for dlfcn.h - found")
endif()
else(DL_INCLUDE_DIRS)
if(NOT DL_FIND_QUIETLY)
message(STATUS "Looking for dlfcn.h - not found")
endif()
set(DL_FOUND false)
endif()
mark_as_advanced(DL_INCLUDE_DIRS)
# Search for the library
find_library(DL_LIBRARIES dl)
if(DL_LIBRARIES)
if(NOT DL_FIND_QUIETLY)
message(STATUS "Looking for libdl - found")
endif()
else(DL_LIBRARIES)
if(NOT DL_FIND_QUIETLY)
message(STATUS "Looking for libdl - not found")
endif()
set(DL_FOUND false)
endif()
mark_as_advanced(DL_LIBRARIES)
if(DL_FOUND)
include(IgnImportTarget)
ign_import_target(DL)
set(DL_TARGET DL::DL)
endif()
endif()
# We need to manually specify the pkgconfig entry (and type of entry) for dl,
# because ign_pkg_check_modules does not work for it.
include(IgnPkgConfig)
ign_pkg_config_library_entry(DL dl)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(
DL
REQUIRED_VARS DL_FOUND)
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