Add optional binary relocatability

CMakeLists.txt

@@ -91,8 +91,12 @@ gz_find_package (Qt5
   PKGCONFIG "Qt5Core Qt5Quick Qt5QuickControls2 Qt5Widgets"
 )
 
+set(GZ_GUI_PLUGIN_RELATIVE_INSTALL_DIR
+  ${GZ_LIB_INSTALL_DIR}/gz-${GZ_DESIGNATION}-${PROJECT_VERSION_MAJOR}/plugins
+)
+
 set(GZ_GUI_PLUGIN_INSTALL_DIR
-  ${CMAKE_INSTALL_PREFIX}/${GZ_LIB_INSTALL_DIR}/gz-${GZ_DESIGNATION}-${PROJECT_VERSION_MAJOR}/plugins
+  ${CMAKE_INSTALL_PREFIX}/${GZ_GUI_PLUGIN_RELATIVE_INSTALL_DIR}
 )
 
 #============================================================================

include/gz/gui/CMakeLists.txt

@@ -50,6 +50,15 @@ gz_create_core_library(SOURCES
   ${headers_MOC}
   ${resources_RCC}
 )
+gz_add_get_install_prefix_impl(GET_INSTALL_PREFIX_FUNCTION gz::gui::getInstallPrefix
+                               GET_INSTALL_PREFIX_HEADER gz/gui/InstallationDirectories.hh
+                               OVERRIDE_INSTALL_PREFIX_ENV_VARIABLE GZ_GUI_INSTALL_PREFIX)
+
+set_property(
+  SOURCE ${CMAKE_CURRENT_SOURCE_DIR}/../../../src/InstallationDirectories.cc
+  PROPERTY COMPILE_DEFINITIONS
+  GZ_GUI_PLUGIN_RELATIVE_INSTALL_DIR="${GZ_GUI_PLUGIN_RELATIVE_INSTALL_DIR}"
+)
 
 target_link_libraries(${PROJECT_LIBRARY_TARGET_NAME}
   PUBLIC

include/gz/gui/InstallationDirectories.hh

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2023 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.
+ *
+ */
+
+#ifndef GZ_GUI_INSTALLATION_DIRECTORIES_HH_
+#define GZ_GUI_INSTALLATION_DIRECTORIES_HH_
+
+#include <string>
+
+#include <gz/gui/config.hh>
+#include <gz/gui/Export.hh>
+
+namespace gz
+{
+  namespace gui
+  {
+    inline namespace GZ_GUI_VERSION_NAMESPACE {
+
+    /// \brief getInstallPrefix return the install prefix of the library
+    /// i.e. CMAKE_INSTALL_PREFIX unless the library has been moved
+    GZ_GUI_VISIBLE std::string getInstallPrefix();
+
+    /// \brief getPluginInstallDir return the install directory of the plugins
+    GZ_GUI_VISIBLE std::string getPluginInstallDir();
+
+    }
+  }
+}
+
+#endif

include/gz/gui/config.hh.in

@@ -30,6 +30,6 @@
 
 #define GZ_GUI_VERSION_HEADER "Gazebo GUI, version ${PROJECT_VERSION_FULL}\nCopyright (C) 2017 Open Source Robotics Foundation.\nReleased under the Apache 2.0 License.\n\n"
 
-#define GZ_GUI_PLUGIN_INSTALL_DIR "${CMAKE_INSTALL_PREFIX}/${GZ_LIB_INSTALL_DIR}/gz-${GZ_DESIGNATION}-${PROJECT_VERSION_MAJOR}/plugins"
+#define GZ_GUI_PLUGIN_INSTALL_DIR _Pragma ("GCC warning \"'GZ_GUI_PLUGIN_INSTALL_DIR' macro is deprecated, use gz::gui::getPluginInstallDir() function instead. \"") "${GZ_GUI_PLUGIN_INSTALL_DIR}"
 
 #endif  // GZ_GUI_CONFIG_HH_

src/Application.cc

@@ -31,6 +31,7 @@
 #include "gz/gui/config.hh"
 #include "gz/gui/Dialog.hh"
 #include "gz/gui/Helpers.hh"
+#include "gz/gui/InstallationDirectories.hh"
 #include "gz/gui/MainWindow.hh"
 #include "gz/gui/Plugin.hh"
 
@@ -460,12 +461,12 @@ bool Application::LoadPlugin(const std::string &_filename,
   // Add default folder and install folder
   std::string home;
   common::env(GZ_HOMEDIR, home);
-  systemPaths.AddPluginPaths(home + "/.gz/gui/plugins:" +
-                             GZ_GUI_PLUGIN_INSTALL_DIR);
+  systemPaths.AddPluginPaths(home + "/.gz/gui/plugins");
+  systemPaths.AddPluginPaths(gz::gui::getPluginInstallDir());
 
   // TODO(CH3): Deprecated. Remove on tock.
-  systemPaths.AddPluginPaths(home + "/.ignition/gui/plugins:" +
-                             GZ_GUI_PLUGIN_INSTALL_DIR);
+  systemPaths.AddPluginPaths(home + "/.ignition/gui/plugins");
+  systemPaths.AddPluginPaths(gz::gui::getPluginInstallDir());
 
 
   auto pathToLib = systemPaths.FindSharedLibrary(_filename);
@@ -775,7 +776,7 @@ std::vector<std::pair<std::string, std::vector<std::string>>>
   paths.push_back(home + "/.ignition/gui/plugins");
 
   // 4. Install path
-  paths.push_back(GZ_GUI_PLUGIN_INSTALL_DIR);
+  paths.push_back(gz::gui::getPluginInstallDir());
 
   // Populate map
   std::vector<std::pair<std::string, std::vector<std::string>>> plugins;

src/CMakeLists.txt

@@ -8,6 +8,7 @@ set (sources
   ${CMAKE_CURRENT_SOURCE_DIR}/GuiEvents.cc
   ${CMAKE_CURRENT_SOURCE_DIR}/Helpers.cc
   ${CMAKE_CURRENT_SOURCE_DIR}/gz.cc
+  ${CMAKE_CURRENT_SOURCE_DIR}/InstallationDirectories.cc
   ${CMAKE_CURRENT_SOURCE_DIR}/MainWindow.cc
   ${CMAKE_CURRENT_SOURCE_DIR}/PlottingInterface.cc
   ${CMAKE_CURRENT_SOURCE_DIR}/Plugin.cc
@@ -53,6 +54,8 @@ gz_build_tests(TYPE UNIT
                   TINYXML2::TINYXML2
                 TEST_LIST
                   gtest_targets
+                ENVIRONMENT 
+                  GZ_GUI_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}
 )
 
 foreach(test ${gtest_targets})
@@ -76,6 +79,7 @@ if(TARGET UNIT_gz_TEST)
 
   set(_env_vars)
   list(APPEND _env_vars "GZ_CONFIG_PATH=${CMAKE_BINARY_DIR}/test/conf")
+  list(APPEND _env_vars "GZ_GUI_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}")
 
   set_tests_properties(UNIT_gz_TEST PROPERTIES
     ENVIRONMENT "${_env_vars}")

src/InstallationDirectories.cc

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2023 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.
+ *
+*/
+
+#include <gz/gui/config.hh>
+#include <gz/gui/InstallationDirectories.hh>
+
+#include <gz/common/Filesystem.hh>
+
+namespace gz
+{
+namespace gui
+{
+inline namespace GZ_GUI_VERSION_NAMESPACE {
+
+std::string getPluginInstallDir()
+{
+  return gz::common::joinPaths(
+      getInstallPrefix(), GZ_GUI_PLUGIN_RELATIVE_INSTALL_DIR);
+}
+
+}
+}
+}

src/plugins/CMakeLists.txt

@@ -93,7 +93,9 @@ function(gz_gui_add_plugin plugin_name)
         # Used to make test-directory headers visible to the unit tests
         ${PROJECT_SOURCE_DIR}
         # Used to make test_config.h visible to the unit tests
-        ${PROJECT_BINARY_DIR})
+        ${PROJECT_BINARY_DIR}
+      ENVIRONMENT 
+        GZ_GUI_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX})
   endif()
 
   if (MSVC)

test/integration/CMakeLists.txt

@@ -10,4 +10,6 @@ gz_build_tests(
     gz-plugin${GZ_PLUGIN_VER}::loader
     gz-rendering${GZ_RENDERING_VER}::gz-rendering${GZ_RENDERING_VER}
     Qt5::Test
+  ENVIRONMENT 
+    GZ_GUI_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}
 )

test/performance/CMakeLists.txt

@@ -1,3 +1,5 @@
 gz_get_sources(tests)
 
-gz_build_tests(TYPE PERFORMANCE SOURCES ${tests})
+gz_build_tests(TYPE PERFORMANCE
+               SOURCES ${tests}
+               ENVIRONMENT GZ_GUI_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX})

test/regression/CMakeLists.txt

@@ -1,3 +1,5 @@
 gz_get_sources(tests)
 
-gz_build_tests(TYPE REGRESSION SOURCES ${tests})
+gz_build_tests(TYPE REGRESSION 
+               SOURCES ${tests}
+               ENVIRONMENT GZ_GUI_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX})