Make the copy of codegen.py work in all cases

Author: alanxz

librabbitmq/CMakeLists.txt

@@ -3,13 +3,17 @@ project(librabbitmq "C")
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
 # Stuff dealing with code generation
-configure_file(codegen.py ${AMQP_CODEGEN_DIR}/codegen.py)
-
 set(AMQP_CODEGEN_PY "${AMQP_CODEGEN_DIR}/amqp_codegen.py")
 set(CODEGEN_PY "${AMQP_CODEGEN_DIR}/codegen.py")
 set(AMQP_SPEC_JSON_PATH "${AMQP_CODEGEN_DIR}/amqp-rabbitmq-0.9.1.json")
 
 #generate amqp_framing.h/amqp_framing.c
+add_custom_command(
+ OUTPUT ${CODEGEN_PY}
+ COMMAND ${CMAKE_COMMAND} ARGS -E copy ${CMAKE_CURRENT_SOURCE_DIR}/codegen.py ${CODEGEN_PY}
+ DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/codegen.py
+ VERBATIM)
+
 add_custom_command(
  OUTPUT "amqp_framing.h"
  COMMAND ${PYTHON_EXECUTABLE} ARGS ${CODEGEN_PY} header ${AMQP_SPEC_JSON_PATH} ${CMAKE_CURRENT_BINARY_DIR}/amqp_framing.h