Build examples from CMake rather than executable

Signed-off-by: Michael Carroll <michael@openrobotics.org>

CMakeLists.txt

@@ -10,6 +10,7 @@ project(gz-math7 VERSION 7.0.0)
 #============================================================================
 # If you get an error at this line, you need to install gz-cmake
 find_package(gz-cmake3 REQUIRED)
+set(GZ_CMAKE_VER ${gz-cmake3_VERSION_MAJOR})
 
 #============================================================================
 # Configure the project
@@ -41,7 +42,7 @@ option(USE_DIST_PACKAGES_FOR_PYTHON
 
 #--------------------------------------
 # Find gz-utils
-gz_find_package(gz-utils2 REQUIRED)
+gz_find_package(gz-utils2 REQUIRED COMPONENTS cli)
 set(GZ_UTILS_VER ${gz-utils2_VERSION_MAJOR})
 
 #--------------------------------------
@@ -122,3 +123,16 @@ configure_file(${CMAKE_SOURCE_DIR}/tutorials.md.in ${CMAKE_BINARY_DIR}/tutorials
 gz_create_docs(
   API_MAINPAGE_MD "${CMAKE_BINARY_DIR}/api.md"
   TUTORIALS_MAINPAGE_MD "${CMAKE_BINARY_DIR}/tutorials.md")
+
+#============================================================================
+# Build examples 
+#============================================================================
+if (BUILD_TESTING)
+  gz_build_examples(
+    SOURCE_DIR ${PROJECT_SOURCE_DIR}/examples
+    BINARY_DIR ${PROJECT_BINARY_DIR}/examples
+    DEPENDENCIES 
+      gz-cmake${GZ_CMAKE_VER} 
+      gz-utils${GZ_UTILS_VER} 
+  )
+endif()

test/CMakeLists.txt

@@ -5,27 +5,6 @@ include_directories (
   ${PROJECT_BINARY_DIR}/include
 )
 
-#============================================================================
-# Do a fake install of gz-math in order to test the examples.
-#============================================================================
-# install to FAKE_INSTALL_PREFIX defined in root CMakeLists.txt
-
-file(MAKE_DIRECTORY ${FAKE_INSTALL_PREFIX})
-
-include(ExternalProject)
-ExternalProject_Add(
-  FAKE_INSTALL
-
-  SOURCE_DIR "${CMAKE_SOURCE_DIR}"
-  EXCLUDE_FROM_ALL 1
-  LOG_CONFIGURE 1
-  LOG_BUILD 1
-  LOG_INSTALL 1
-  CMAKE_ARGS
-    "-DBUILD_TESTING=OFF"
-    "-DCMAKE_INSTALL_PREFIX=${FAKE_INSTALL_PREFIX}"
-)
-
 add_subdirectory(gtest_vendor)
 add_subdirectory(integration)
 add_subdirectory(performance)

test/integration/CMakeLists.txt

@@ -10,12 +10,3 @@ if (UNIX AND NOT APPLE)
 endif()
 
 gz_build_tests(TYPE INTEGRATION SOURCES ${tests})
-
-if(TARGET INTEGRATION_ExamplesBuild_TEST)
-  add_dependencies(INTEGRATION_ExamplesBuild_TEST FAKE_INSTALL)
-
-  set(_env_vars)
-  list(APPEND _env_vars "CMAKE_PREFIX_PATH=${FAKE_INSTALL_PREFIX}:$ENV{CMAKE_PREFIX_PATH}")
-  set_tests_properties(INTEGRATION_ExamplesBuild_TEST PROPERTIES
-    ENVIRONMENT "${_env_vars}")
-endif()