VC++ Object Filename configuration with CMake

Question

I am building a multi-platform library and recently made a change in the source files.

Basically, I now got:

\sources
|----\common
     |---- tcp_socket.cpp
|----\windows
     |---- tcp_socket.cpp
|----\unix
     |---- tcp_socket.cpp

While it compiles fine on mac/linux and some VC++ versions, some of the users of my library encounter the stupid MSVC error:

MSB8027 Two or more files with the name of tcp_socket.cpp will produce outputs to the same location. This can lead to an incorrect build result. The files involved are ..\Classes\socket\tacopie\network\common\tcp_socket.cpp, ..\Classes\socket\tacopie\network\unix\tcp_socket.cpp, ..\Classes\socket\tacopie\network\windows\tcp_socket.cpp.   test C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.CppBuild.targets  936

The solution I keep seeing over and over again is like the one reported here: VisualStudio project with multiple sourcefiles of the same name? Basically, changing the Object Filename property of Output File configuration for the project properties in VC++ from $(IntDir) to $(IntDir)%(RelativeDir).

That sounds like a working solution, but I'd like to set it up directly from the CMakelist, otherwise, the users of my library would have to do this trick by themselves.

Is there any way to achieve that with CMake?

Edit: below is the cmakelist

###
# config
###
cmake_minimum_required(VERSION 2.8.7)
set(CMAKE_MACOSX_RPATH 1)
include(${CMAKE_ROOT}/Modules/ExternalProject.cmake)


###
# verbose make
###
# set(CMAKE_VERBOSE_MAKEFILE TRUE)


###
# project
###
set(PROJECT tacopie)
project(${PROJECT} CXX)


###
# compilation options
###
IF (WIN32)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W3 /O2 /bigobj")

  # was causing conflics with gtest build
  string(REPLACE "/RTC1" "" CMAKE_CXX_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG})

  IF ("${MSVC_RUNTIME_LIBRARY_CONFIG}" STREQUAL "")
    set(MSVC_RUNTIME_LIBRARY_CONFIG "/MT")
  ENDIF()

  foreach (flag_var CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE)
    IF ("${MSVC_RUNTIME_LIBRARY_CONFIG}" STREQUAL "/MT")
      string(REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
    ELSEIF ("${MSVC_RUNTIME_LIBRARY_CONFIG}" STREQUAL "/MD")
      string(REPLACE "/MT" "/MD" ${flag_var} "${${flag_var}}")
    ELSE ()
      string(REPLACE "/MD" "${MSVC_RUNTIME_LIBRARY_CONFIG}" ${flag_var} "${${flag_var}}")
      string(REPLACE "/MT" "${MSVC_RUNTIME_LIBRARY_CONFIG}" ${flag_var} "${${flag_var}}")
    ENDIF()
  endforeach()

  add_definitions(-D_UNICODE)
  add_definitions(-DUNICODE)
  add_definitions(-DWIN32_LEAN_AND_MEAN)
ELSE ()
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -W -Wall -Wextra -O3")
ENDIF (WIN32)


###
# variables
###
set(DEPS_INCLUDES ${PROJECT_SOURCE_DIR}/deps/include)
set(DEPS_LIBRARIES ${PROJECT_SOURCE_DIR}/deps/lib)
set(TACOPIE_INCLUDES ${PROJECT_SOURCE_DIR}/includes)


###
# includes
###
include_directories(${TACOPIE_INCLUDES})

###
# sources
###
set(SRC_DIRS "sources" "sources/network" "sources/network/common" "sources/utils" "includes/tacopie" "includes/tacopie/network" "includes/tacopie/utils")

IF (WIN32)
  set(SRC_DIRS ${SRC_DIRS} "sources/network/windows")
ELSE ()
  set(SRC_DIRS ${SRC_DIRS} "sources/network/unix")
ENDIF (WIN32)

foreach(dir ${SRC_DIRS})
  # get directory sources and headers
  file(GLOB s_${dir} "${dir}/*.cpp")
  file(GLOB h_${dir} "${dir}/*.hpp")
  file(GLOB i_${dir} "${dir}/*.ipp")

  # set sources
  set(SOURCES ${SOURCES} ${s_${dir}} ${h_${dir}} ${i_${dir}})
endforeach()


###
# outputs
###
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)


###
# executable
###
add_library(${PROJECT} STATIC ${SOURCES})

IF (WIN32)
   set_target_properties(${PROJECT}
                         PROPERTIES COMPILE_PDB_NAME ${PROJECT}
                         COMPILE_PDB_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
ENDIF (WIN32)

IF (WIN32)
  target_link_libraries(${PROJECT} ws2_32)
ELSE ()
  target_link_libraries(${PROJECT} pthread)
ENDIF (WIN32)

# __TACOPIE_LOGGING_ENABLED
IF (LOGGING_ENABLED)
  set_target_properties(${PROJECT} PROPERTIES COMPILE_DEFINITIONS "__TACOPIE_LOGGING_ENABLED=${LOGGING_ENABLED}")
ENDIF (LOGGING_ENABLED)

# __TACOPIE_CONNECTION_QUEUE_SIZE
IF (CONNECTION_QUEUE_SIZE)
  set_target_properties(${PROJECT} PROPERTIES COMPILE_DEFINITIONS "__TACOPIE_CONNECTION_QUEUE_SIZE=${CONNECTION_QUEUE_SIZE}")
ENDIF (CONNECTION_QUEUE_SIZE)

#__TACOPIE_IO_SERVICE_NB_WORKERS
IF (IO_SERVICE_NB_WORKERS)
  set_target_properties(${PROJECT} PROPERTIES COMPILE_DEFINITIONS "__TACOPIE_IO_SERVICE_NB_WORKERS=${IO_SERVICE_NB_WORKERS}")
ENDIF(IO_SERVICE_NB_WORKERS)

#__TACOPIE_TIMEOUT
IF (SELECT_TIMEOUT)
  set_target_properties(${PROJECT} PROPERTIES COMPILE_DEFINITIONS "__TACOPIE_TIMEOUT=${SELECT_TIMEOUT}")
ENDIF(SELECT_TIMEOUT)


###
# install
###
# ensure lib and bin directories exist
install(DIRECTORY DESTINATION ${CMAKE_BINARY_DIR}/lib/)
install(DIRECTORY DESTINATION ${CMAKE_BINARY_DIR}/bin/)
# install tacopie
install (DIRECTORY ${CMAKE_BINARY_DIR}/lib/ DESTINATION lib USE_SOURCE_PERMISSIONS)
install (DIRECTORY ${CMAKE_BINARY_DIR}/bin/ DESTINATION bin USE_SOURCE_PERMISSIONS)
install (DIRECTORY ${TACOPIE_INCLUDES}/ DESTINATION include USE_SOURCE_PERMISSIONS)


###
# examples
###
IF (BUILD_EXAMPLES)
  add_subdirectory(examples)
ENDIF(BUILD_EXAMPLES)


###
# tests
###
IF (BUILD_TESTS)
  add_subdirectory(tests)
  ExternalProject_Add("googletest"
                      GIT_REPOSITORY "https://github.com/google/googletest.git"
                      CMAKE_ARGS "-DCMAKE_INSTALL_PREFIX=${PROJECT_SOURCE_DIR}/deps")
ENDIF(BUILD_TESTS)