cmake 学习之路 记录中间所遇到过的所有错误与问题的解决 <四>

CMAKE_BUILD_TYPE 宏匹配问题：

错误代码：

# Linux operation system
IF (CMAKE_BUILD_TYPE MATCHES "Debug"
OR CMAKE_BUILD_TYPE MATCHES "None"
OR CMAKE_BUILD_TYPE MATCHES "")
ADD_DEFINITIONS(-D _DEBUG_CDB)
ADD_DEFINITIONS(-D DEBUG)
ELSEIF (CMAKE_BUILD_TYPE MATCHES "Release")
ELSEIF (CMAKE_BUILD_TYPE MATCHES "RelWitchDebInfo")
ELSEIF (CMAKE_BUILD_TYPE MATCHES "MinSizeRel")
ELSE ()
MESSAGE(FATAL_ERROR "unknown CMAKE_BUILD_TYPE = ${CMAKE_BUILD_TYPE},"
" CMAKE_BUILD_TYPE: Debug or None, Release, RelWitchDebInfo,"
" RelWitchDebInfo")
ENDIF ()

正确代码：

# Linux operation system
IF (CMAKE_BUILD_TYPE MATCHES "Debug"
OR CMAKE_BUILD_TYPE MATCHES "None")
ADD_DEFINITIONS(-D _DEBUG_CDB)
ADD_DEFINITIONS(-D DEBUG)
ELSEIF (CMAKE_BUILD_TYPE MATCHES "Release")
ELSEIF (CMAKE_BUILD_TYPE MATCHES "RelWitchDebInfo")
ELSEIF (CMAKE_BUILD_TYPE MATCHES "MinSizeRel")
ELSE ()
MESSAGE(FATAL_ERROR "unknown CMAKE_BUILD_TYPE = ${CMAKE_BUILD_TYPE},"
" CMAKE_BUILD_TYPE: Debug or None, Release, RelWitchDebInfo,"
" RelWitchDebInfo")
ENDIF ()

如果你够仔细的话应该不难发现两者的差别仅仅是一行 CMAKE_BUILD_TYPE MATCHES "" 而以，我用的时候以为这个是匹配未定义呢，结果不是。未定义的时候该值为"None" 如果只给一个"" 那么它会匹配所有