cmake编译器布尔开关问题

Question

I'm pretty new to cmake. I'm using the following:

cmake -DUSE_OLD_CODE:BOOL=FALSE

This works fine. But when I change the FALSE to TRUE , the compiler seems to think that USE_OLD_CODE is a file and then complains that it cannot find it.

Below is CMakeLists.txt

cmake_minimum_required(VERSION 3.5.1)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

add_compile_options(-std=c++11 /W4 /wd"4127" /wd"4201" /MP)

IF(USE_OLD_CODE) add_compile_options(/D "USE_OLD_CODE") ENDIF(USE_OLD_CODE)

set( SOURCES "main.cpp" )

set (OLD_CODE_SOURCES "OldCode.cpp" )

set (NEW_CODE_SOURCES "NewCode.cpp" )

IF(USE_OLD_CODE) set (SOURCES ${SOURCES} "${OLD_CODE_SOURCES}") ELSE(USE_OLD_CODE) set (SOURCES ${SOURCES} "${NEW_CODE_SOURCES}") ENDIF(USE_OLD_CODE)

IF(WIN32) add_executable(${EXECUTABLE} WIN32 ${SOURCES}) ELSEIF(UNIX) add_executable(${EXECUTABLE} ${SOURCES}) ENDIF(WIN32)

Any ideas what I am doing wrong?

thanks

james

Answer 1

要启用，您可以使用-DUSE_OLD_CODE：BOOL = ON；要禁用USE_OLD_CODE，请使用-DUSE_OLD_CODE：BOOL = OFF

Answer 2

shouldn't it be add_compile_options("/DUSE_OLD_CODE") ?

msvc doesn't expect a space after "/D" IIRC.

https://msdn.microsoft.com/en-us/library/aa235412(v=vs.60).aspx