Set compiler flags useful for reproducible building.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

modules/TDEMacros.cmake

@@ -2503,6 +2503,22 @@ macro( tde_setup_architecture_flags )
       set( TDE_PIE_CFLAGS -fPIE )
       set( TDE_PIE_LDFLAGS -pie )
     endif( HAVE_PIE_SUPPORT )
+
+    set( _reproducible_cxxflags
+         "-fdebug-prefix-map=${CMAKE_SOURCE_DIR}=."
+         "-fmacro-prefix-map=${CMAKE_SOURCE_DIR}=."
+    )
+    foreach( _flag ${_reproducible_cxxflags} )
+      string( REGEX REPLACE "=.*" "" _flag_name "${_flag}" )
+      string( REGEX REPLACE "[^a-zA-Z0-9]+" "_" _flag_var "CXXFLAG_${_flag_name}" )
+      if( NOT "${CMAKE_CXX_FLAGS}" MATCHES "(^| )${_flag_name}" )
+        check_cxx_compiler_flag( "${_flag}" ${_flag_var} )
+        if( ${_flag_var} )
+          set( CMAKE_C_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}" )
+          set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}" )
+        endif()
+      endif()
+    endforeach()
   endif( )
 endmacro( )