[CMake] VS2010 tries to compile a file with *.res extension when its copied

[Aaron_Wright at selinc.com]

I know I've asked this before, but now I've narrowed it down a bit and I 
have an example. This copies a *.res file to the binary directory where 
presumably the executable can find it. The executable has that file as a 
source file to hook up the dependency, and the copied file has the 
HEADER_FILE_ONLY property set. Yet, somehow VS2010 is still trying to 
compile en.res. I even tried setting the source and destination en.res 
files to HEADER_FILE_ONLY, but that didn't fix it. Removing the 
ADD_CUSTOM_COMMAND that does the copy fixes the problem. Why is this 
broken? FYI, it worked fine in VS2008.

CMAKE_MINIMUM_REQUIRED(VERSION 2.8)

PROJECT(cmake_res_bug)

SET(RESOURCE_FILE "${PROJECT_SOURCE_DIR}/resources/en.res")

GET_FILENAME_COMPONENT(RESOURCE_FILE_BASENAME "${RESOURCE_FILE}" NAME)
SET(LOCAL_RESOURCE_FILE 
"${PROJECT_BINARY_DIR}/resources/${RESOURCE_FILE_BASENAME}")

ADD_CUSTOM_COMMAND(
   OUTPUT "${PROJECT_BINARY_DIR}/resources/${RESOURCE_FILE_BASENAME}"
   COMMAND ${CMAKE_COMMAND} -E make_directory 
"${PROJECT_BINARY_DIR}/resources"
   COMMAND ${CMAKE_COMMAND} -E copy "${RESOURCE_FILE}" 
"${PROJECT_BINARY_DIR}/resources"
   DEPENDS "${RESOURCE_FILE}"
   COMMENT "Localizing ${RESOURCE_FILE_BASENAME}")

SET_SOURCE_FILES_PROPERTIES(
   "${LOCAL_RESOURCE_FILE}"
   PROPERTIES HEADER_FILE_ONLY TRUE)

INCLUDE_DIRECTORIES("${PROJECT_BINARY_DIR}")

ADD_EXECUTABLE(
   ${PROJECT_NAME}
   "${PROJECT_SOURCE_DIR}/src/main.cpp"
   "${LOCAL_RESOURCE_FILE}")

---
Aaron Wright