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<base href="https://llvm.org/bugs/" />
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<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>
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<th>Summary</th>
<td>unwanted warnings in system headers using #line
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.8
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<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>
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<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>
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</p>
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