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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - modules: `#pragma once` must appear before `#ifdef` when using `-fmodules`"
href="https://bugs.llvm.org/show_bug.cgi?id=39184">39184</a>
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<th>Summary</th>
<td>modules: `#pragma once` must appear before `#ifdef` when using `-fmodules`
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Modules
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>andrewjcg@gmail.com
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>When compiling with `-fmodules` (but not necessarily actually building
modules), `#pragma once` guards don't work when appearing after a `#ifdef ...`
guard. Example failing test:
<a href="https://reviews.llvm.org/differential/diff/168367/">https://reviews.llvm.org/differential/diff/168367/</a>.
I couldn't find any supporting documentation saying that `#pragma once` must
come first, but assuming this is true, then this probably isn't a bug (but
maybe should then be a warning?).</pre>
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