<html>
    <head>
      <base href="https://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - unwanted warnings in system headers using #line"
   href="https://llvm.org/bugs/show_bug.cgi?id=30752">30752</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>unwanted warnings in system headers using #line
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>3.8
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>-New Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>etienne@atnnn.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>System headers using #line don't ignore extra warning and error flags:

==> sys/line.h <==
#line 1 "foo.h"
foo();

==> sys/noline.h <==
foo();

==> test.c <==
#include <noline.h>
#include <line.h>

$ gcc -c -isystem sys -Wall test.c

$ clang -c -isystem sys -Wall test.c
In file included from test.c:2:
foo.h:1:1: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
foo();
^
1 warning generated.


This behaviour makes it harder to build and develop on the NixOS Linux
distribution which adds #line directives to many system headers.</pre>
        </div>
      </p>
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