<div dir="ltr"><div><div>Hi,<br><br></div>As per GCC Documentation (<a href="https://gcc.gnu.org/onlinedocs/cpp/Search-Path.html">https://gcc.gnu.org/onlinedocs/cpp/Search-Path.html</a>) if you do not instruct GCC otherwise, <br>it will look for headers
requested with <code>#include <</code><var>file</var><code>></code> in:
<pre class="smallexample"> /usr/local/include
<var>libdir</var>/gcc/<var>target</var>/<var>version</var>/include
/usr/<var>target</var>/include
/usr/include
</pre>You can very well prioritize header file lookup to your path via -I<path of header> flag during compilation.<br></div><div>Another option is to provide --sysroot=<path to sysroot> in order to lookup system headers in your own<br></div><div>sysroot.<br><br>Command cpp -v will show you the look up process of header file.<br><br></div><div>Thanks<br></div><div>Akash Bhatnagar<br></div><div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Aug 5, 2015 at 3:13 PM, Nan Xiao <span dir="ltr"><<a href="mailto:xiaonan830818@gmail.com" target="_blank">xiaonan830818@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi all,<div><br></div><div>I want to make sure the searching header file path when building Linux kernel:</div><div>Per my understanding, the gcc only find header files in current building linux </div><div>directory: include/*, won't search system header file path: such as /usr/inclue,</div><div> /usr/local/include, etc.</div><div><br></div><div>Is my understanding right? Thanks very much in advance!</div><div><br clear="all"><div><div><div dir="ltr">Best Regards<span class="HOEnZb"><font color="#888888"><div>Nan Xiao</div></font></span></div></div></div>
</div></div>
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