在CMake中，CHECK\u INCLUDE\u FILE\u CXX如何工作？

下面的代码不打印任何内容

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

但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

我试着用

include_directories( "/usr/local/include" )

---

但是GLOG_INCLUDE在之后仍然未定义（logging.h仍然未找到）。

查看checkIncludeFilexx.cmake。它应该在cmake安装的目录中（我在/usr/share/cmake-2.8/Modules中有）

该文件说明：

# 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)