查看gcc/g++默认include路径

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转自：http://blog.chinaunix.net/uid-23145525-id-3976696.html

`gcc -print-prog-name=cc1plus` -v

`g++ -print-prog-name=cc1plus` -v

例如，CentOS 6.3 64bit 下，`g++ -print-prog-name=cc1plus` -v 的运行结果是：

ignoring nonexistent directory "/usr/lib/gcc/x86_64-redhat-linux/4.4.6/include-fixed"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../x86_64-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6
/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/x86_64-redhat-linux
/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/backward
/usr/local/include
/usr/lib/gcc/x86_64-redhat-linux/4.4.6/include
/usr/include
End of search list.

即，默认include路径是

/usr/include/c++/4.4.6
/usr/include/c++/4.4.6/x86_64-redhat-linux
/usr/include/c++/4.4.6/backward
/usr/local/include
/usr/lib/gcc/x86_64-redhat-linux/4.4.6/include
/usr/include

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