Eclipse 中新建C 或C ++到项目时，头文件报警，显示“Unresolved inclusion:<stdio.h>” 虽然不影响项目到编译和运行，确也无法查看头文件，让人感觉实在不爽。下面是在国外到网站上看到解决方案，自己整理了一下拿来分享一下。关于在Eclipse 下配置C /C ++ 开发环境这里不多说了。
在终端下查看C 库文件到路径：
$ echo "int main() { return 0; }" > a1.c
$ gcc -v a1.c
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-linux-gnu/4.9/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
搜索列表结束。
……
查看C++ 库文件到搜索路径：
$ echo "int main() { return 0; }" > a1.cpp
$ g++ -v a1.cpp
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/4.9
/usr/include/x86_64-linux-gnu/c++/4.9
/usr/include/c++/4.9/backward
/usr/lib/gcc/x86_64-linux-gnu/4.9/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
搜索列表结束。
上述路径因人而异。
在eclipse中菜单Window --> Preferences --> C/C++ --> Build --> Environment添加环境变量
C_INCLUDE_PATH =/usr/lib/gcc/x86_64-linux-gnu/4.9/include:/usr/local/include:/usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed:/usr/include/x86_64-linux-gnu:/usr/include
CPLUS_INCLUDE_PATH =/usr/include/c++/4.9:/usr/include/x86_64-linux-gnu/c++/4.9:/usr/include/c++/4.9/backward:/usr/lib/gcc/x86_64-linux-gnu/4.9/include:/usr/local/include:/usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed:/usr/include/x86_64-linux-gnu:/usr/include
记得选中下面的Append variables to native environment.
添加完后重启Eclipse 新建项目即可。
