今天第一次使用cmake的CHECK_INCLUDE_FILE_CXX
函数检查是否存在 codecvt
include文件,然而出错了(编译器使用gcc 5.4.0)。
cmake脚本如下:
include(CheckIncludeFileCXX)
# 检查是否存在 codecvt header file
CHECK_INCLUDE_FILE_CXX(codecvt HAS_CODECVT )
# 检查是否存在 algorithm header file
CHECK_INCLUDE_FILE_CXX(algorithm HAS_ALGORITHM )
message(HAS_CODECVT=${HAS_CODECVT})
message(HAS_ALGORITHM=${HAS_ALGORITHM})
输出显示,能找到algorithm
,却找不到codecvt
– Looking for C++ include codecvt – Looking for C++ include codecvt - not found – Looking for C++ include algorithm – Looking for C++ include algorithm - found HAS_CODECVT= HAS_ALGORITHM=1
明明我看到存在这个codecvt
文件,cmake输出就是找不到
想来codecvt
是在c++11
标准下才支持的文件,于是我如下增加-std=c++11
编译选项再试则问题解决
include(CheckIncludeFileCXX)
set(CMAKE_REQUIRED_FLAGS -std=c++11)
# 检查是否存在 codecvt header file
CHECK_INCLUDE_FILE_CXX(codecvt HAS_CODECVT )
# 检查是否存在 algorithm header file
CHECK_INCLUDE_FILE_CXX(algorithm HAS_ALGORITHM )
message(HAS_CODECVT=${HAS_CODECVT})
message(HAS_ALGORITHM=${HAS_ALGORITHM})
– Looking for C++ include codecvt – Looking for C++ include codecvt - found – Looking for C++ include algorithm – Looking for C++ include algorithm - found HAS_CODECVT=1 HAS_ALGORITHM=1