Fixes to install config setup.

cmake/GameNetworkingSocketsConfig.cmake.in

@@ -18,12 +18,23 @@ endif()
 
 include(${CMAKE_CURRENT_LIST_DIR}/GameNetworkingSockets.cmake)
 
-set_target_properties(
-    GameNetworkingSockets::GameNetworkingSockets GameNetworkingSockets::GameNetworkingSockets_s
-    PROPERTIES IMPORTED_GLOBAL True
-)
-
 if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.11.0")
+    # Need to set IMPORTED_GLOBAL in order to create the aliases
+    # However, IMPORTED_GLOBAL only exists in 3.11 and up
+    # Also, setting IMPORTED_GLOBAL from another directory from where it was first set blows up
+    # so we can only set it once.
+
+    get_target_property(GNS_IMPORTED_GLOBAL_SET GameNetworkingSockets::GameNetworkingSockets IMPORTED_GLOBAL)
+
+    if(NOT ${GNS_IMPORTED_GLOBAL_SET})
+        set_target_properties(
+            GameNetworkingSockets::GameNetworkingSockets GameNetworkingSockets::GameNetworkingSockets_s
+            PROPERTIES IMPORTED_GLOBAL True
+        )
+    endif()
+
+    unset(GNS_IMPORTED_GLOBAL_SET)
+
     add_library(GameNetworkingSockets::shared ALIAS GameNetworkingSockets::GameNetworkingSockets)
     add_library(GameNetworkingSockets::static ALIAS GameNetworkingSockets::GameNetworkingSockets_s)
 endif()

src/CMakeLists.txt

@@ -315,6 +315,16 @@ if(NOT (USE_STEAMWEBRTC AND STEAMWEBRTC_ABSL_SOURCE STREQUAL submodule))
 
 	include(CMakePackageConfigHelpers)
 
+	# Ensure that variables used in GameNetworkingSocketsConfig.cmake.in have some value
+	# rather than an empty string.
+	if(NOT USE_CRYPTO)
+		set(USE_CRYPTO USE_CRYPTO-NOTFOUND)
+	endif()
+
+	if(NOT STEAMWEBRTC_ABSL_SOURCE)
+		set(STEAMWEBRTC_ABSL_SOURCE STEAMWEBRTC_ABSL_SOURCE-NOTFOUND)
+	endif()
+
 	configure_package_config_file(../cmake/GameNetworkingSocketsConfig.cmake.in
 		${CMAKE_CURRENT_BINARY_DIR}/GameNetworkingSocketsConfig.cmake
 		INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/GameNetworkingSockets