Question

以下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)

但我有以下环境变量集：

export CPLUS_INCLUDE_PATH=/usr/local/include

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

我尝试使用

include_directories( "/usr/local/include" )

但GLOG_INCLUDE在（找不到logging.h之后）仍未定义。

Answer 1

看看CheckIncludeFileCXX.cmake。它应该在你的cmake安装目录中（我在/usr/share/cmake-2.8/Modules中有它）。

此文件声明：

# 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，您可以在调用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)

在CMake中，CHECK_INCLUDE_FILE_CXX如何工作？

1 个答案: