Merge pull request #681 from johnb003/patch-1

CMakeLists.txt support for relocatable installs

CMakeLists.txt

@@ -60,7 +60,7 @@ set_target_properties(tinyxml2 PROPERTIES
 if(DEFINED CMAKE_VERSION AND NOT "${CMAKE_VERSION}" VERSION_LESS "2.8.11")
     target_include_directories(tinyxml2 PUBLIC 
                           $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
-                          $<INSTALL_INTERFACE:${CMAKE_INSTALL_PREFIX}/include>)
+                          $<INSTALL_INTERFACE:include>)
 
     if(MSVC)
       target_compile_definitions(tinyxml2 PUBLIC -D_CRT_SECURE_NO_WARNINGS)
@@ -97,7 +97,7 @@ target_compile_definitions(tinyxml2_static PUBLIC -D_CRT_SECURE_NO_WARNINGS)
 if(DEFINED CMAKE_VERSION AND NOT "${CMAKE_VERSION}" VERSION_LESS "2.8.11")
     target_include_directories(tinyxml2_static PUBLIC 
                           $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
-                          $<INSTALL_INTERFACE:${CMAKE_INSTALL_PREFIX}/include>)
+                          $<INSTALL_INTERFACE:include>)
 
     if(MSVC)
       target_compile_definitions(tinyxml2_static PUBLIC -D_CRT_SECURE_NO_WARNINGS)
@@ -143,13 +143,6 @@ endif()
 
 install(FILES tinyxml2.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 
-foreach(p LIB INCLUDE)
-	set(var CMAKE_INSTALL_${p}DIR)
-	if(NOT IS_ABSOLUTE "${${var}}")
-		set(${var} "${CMAKE_INSTALL_PREFIX}/${${var}}")
-	endif()
-endforeach()
-
 configure_file(tinyxml2.pc.in tinyxml2.pc @ONLY)
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/tinyxml2.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)