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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Invalid "conflicting types for" in header"
href="https://bugs.llvm.org/show_bug.cgi?id=37529">37529</a>
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<th>Summary</th>
<td>Invalid "conflicting types for" in header
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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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>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>ethan@ethanhs.me
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>I'm working on porting CPython to work with clang-cl on Windows, so first off
thank you for clang-cl!
I've recently hit an edge case which MSC will compile, but clang will refuse to
compile.
Here is a minimal example that shows the issue:
// example.h
float difference(struct timeval *start, struct timeval *end);
// example.c
#include "example.h"
#include <windows.h>
float difference(struct timeval *start, struct timeval *end) {
return end->tv_sec - start->tv_sec;
}
Clang will report "conflicting types for 'difference'" which seems to be due to
the fact it assumes struct timeval in example.h references a new struct, which
is wrong.
I'd normally just move the include of Windows.h into example.h as a work
around, but this isn't always practical. In CPython, the real file is pytime.h,
which is included in Python.h, which is included in just about everthing...
I believe it isn't too uncommon for this pattern to exist, so it'd be great if
it were supported. Thanks!</pre>
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