Revert "Refs 11751. Pass the linker flags using a well-known cmake va…

…riable"

This reverts commit 8ec1fec.

Signed-off-by: Barro <miguelbarro@eprosima.com>

src/cpp/CMakeLists.txt

@@ -506,11 +506,11 @@ if(MSVC OR MSVC_IDE)
     endif()
 elseif(BUILD_SHARED_LIBS)
     set(VERSION_SCRIPT_SUPPORT_FLAGS -Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/libfastrtps.version)
-    set(OLD_CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
-    set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} ${VERSION_SCRIPT_SUPPORT_FLAGS})
+    set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
+    set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} ${VERSION_SCRIPT_SUPPORT_FLAGS})
     CHECK_CXX_SOURCE_COMPILES("int main(int, char**){return 0;}" HAS_VERSION_SCRIPT_SUPPORT)
-    set(CMAKE_CXX_FLAGS ${OLD_CMAKE_CXX_FLAGS})
-    unset(OLD_CMAKE_CXX_FLAGS)
+    set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
+    unset(OLD_CMAKE_REQUIRED_FLAGS)
     if(HAS_VERSION_SCRIPT_SUPPORT)
         message(STATUS "Using linker version script to select exported symbols")
         target_link_options(${PROJECT_NAME} ${PRIVACY} ${VERSION_SCRIPT_SUPPORT_FLAGS})