Fix cmake such that Boost::filesystem is exported properly (moveit#206)

Co-authored-by: Jordan Lack <jlack@houstonmechatronics.com>

CMakeLists.txt

@@ -48,7 +48,7 @@ find_package(eigen3_cmake_module REQUIRED)
 find_package(Eigen3 REQUIRED)
 
 find_package(ament_cmake REQUIRED)
-find_package(Boost REQUIRED filesystem)
+include(ConfigExtras)
 find_package(console_bridge REQUIRED)
 find_package(console_bridge_vendor REQUIRED)
 find_package(eigen_stl_containers REQUIRED)
@@ -126,4 +126,4 @@ install(DIRECTORY include/ DESTINATION include)
 ament_export_targets(export_${PROJECT_NAME} HAS_LIBRARY_TARGET)
 ament_export_dependencies(${THIS_PACKAGE_EXPORT_DEPENDS})
 
-ament_package()
+ament_package(CONFIG_EXTRAS "cmake/ConfigExtras.cmake")

cmake/ConfigExtras.cmake

@@ -0,0 +1,31 @@
+# Copyright 2021 Open Robotics
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#    * Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#
+#    * Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#
+#    * Neither the name of the Open Robotics nor the names of its
+#      contributors may be used to endorse or promote products derived from
+#      this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+# Put find_package calls to packages with components so
+# dependent packages can link against component libraries
+find_package(Boost REQUIRED COMPONENTS filesystem)