Export targets from top-level CMake file

With some slight reordering of the code

CMakeLists.txt

@@ -22,13 +22,18 @@ add_library(glm::glm ALIAS glm)
 if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
 
 	include(CPack)
+	include(GNUInstallDirs)
+	install(TARGETS glm EXPORT glm)
+	install(DIRECTORY glm TYPE INCLUDE PATTERN "CMakeLists.txt" EXCLUDE)
 	install(EXPORT glm FILE glmConfig.cmake DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/glm NAMESPACE glm::)
 	include(CMakePackageConfigHelpers)
 	write_basic_package_version_file("glmConfigVersion.cmake" COMPATIBILITY AnyNewerVersion ARCH_INDEPENDENT)
 	install(FILES ${CMAKE_CURRENT_BINARY_DIR}/glmConfigVersion.cmake DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/glm)
 
-	enable_testing()
-	add_subdirectory(test)
+	include(CTest)
+	if(BUILD_TESTING)
+		add_subdirectory(test)
+	endif()
 
 endif(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
 

glm/CMakeLists.txt

@@ -49,10 +49,6 @@ target_include_directories(glm INTERFACE
 	$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 )
 
-include(GNUInstallDirs)
-install(TARGETS glm EXPORT glm)
-install(DIRECTORY . DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/glm" PATTERN "CMakeLists.txt" EXCLUDE)
-
 if(BUILD_STATIC_LIBS)
 add_library(glm_static STATIC ${ROOT_TEXT} ${ROOT_MD} ${ROOT_NAT}
 	${ROOT_SOURCE}    ${ROOT_INLINE}    ${ROOT_HEADER}