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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - -frewrite-includes loses information about system headers, leading to additional warnings and errors"
href="http://llvm.org/bugs/show_bug.cgi?id=20553">20553</a>
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<th>Summary</th>
<td>-frewrite-includes loses information about system headers, leading to additional warnings and errors
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider:
$ cat x/t.h
int __fastcall f();
$ cat t.c
#include "t.h"
void g() { f(); }
$ clang -c t.c -isystem x -m64 # no warnings
$ clang -c t.c -isystem x -m64 -E -frewrite-includes -o t.ii
$ clang -c t.ii -m64
x\t.h:1:5: warning: calling convention '__fastcall' ignored for this target
[-Wignored-attributes]
int __fastcall f();
^
1 warning generated.
This is really annoying when working with crashers on Windows, where system
headers are rife with warnings.</pre>
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</p>
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