Hi, As per GCC Documentation ( https://gcc.gnu.org/onlinedocs/cpp/Search-Path.html) if you do not instruct GCC otherwise, it will look for headers requested with #include <file> in: /usr/local/include libdir/gcc/target/version/include /usr/target/include /usr/include You can very well prioritize header file lookup to your path via -I<path of header> flag during compilation. Another option is to provide --sysroot=<path to sysroot> in order to lookup system headers in your own sysroot. Command cpp -v will show you the look up process of header file. Thanks Akash Bhatnagar On Wed, Aug 5, 2015 at 3:13 PM, Nan Xiao <xiaonan830818@gmail.com> wrote:

Hi all,

I want to make sure the searching header file path when building Linux kernel: Per my understanding, the gcc only find header files in current building linux directory: include/*, won't search system header file path: such as /usr/inclue, /usr/local/include, etc.

Is my understanding right? Thanks very much in advance!

Best Regards Nan Xiao

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