cmake - 在CMake中，CHECK_INCLUDE_FILE_CXX如何工作？

Question

以下代码不输出任何内容

CHECK_INCLUDE_FILE_CXX(glog/logging.h GLOG_INCLUDE)
IF(GLOG_INCLUDE)
   MESSAGE("YY")
ENDIF(GLOG_INCLUDE)

但是我设置了以下环境变量:

export CPLUS_INCLUDE_PATH=/usr/local/include

并且，“ls/usr/local/include/glog/logging.h”返回文件。

我尝试使用

include_directories( "/usr/local/include" )

但之后GLOG_INCLUDE仍未定义(未找到logging.h。)

Answer 1

看一下CheckIncludeFileCXX.cmake。它应该在您的cmake安装目录中(我在/usr/share/cmake-2.8/Modules中)。

该文件指出:

# The following variables may be set before calling this macro to
# modify the way the check is run:
#
#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
#  CMAKE_REQUIRED_INCLUDES = list of include directories
#  

因此，您可以在校准命令之前尝试设置此变量，如下所示:

set (CMAKE_REQUIRED_INCLUDES "/usr/local/include")
CHECK_INCLUDE_FILE_CXX(glog/logging.h GLOG_INCLUDE)
IF(GLOG_INCLUDE)
   MESSAGE("YY")
ENDIF(GLOG_INCLUDE)