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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wrong macro redefinition report when using precompiled headers"
href="https://bugs.llvm.org/show_bug.cgi?id=38094">38094</a>
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<th>Summary</th>
<td>Wrong macro redefinition report when using precompiled headers
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>6.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>libclang
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>contact@micbou.com
</td>
</tr>
<tr>
<th>CC</th>
<td>klimek@google.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Given the file:
```test.c
#undef TEST
#define TEST 1
```
Running the command:
```
CINDEXTEST_EDITING=1 c-index-test -test-load-source local test.c -DTEST=2
```
results in the incorrect warning:
```
// CHECK: <invalid loc>:1:9: macro definition=TEST
warning: 'TEST' macro redefined [-Wmacro-redefined]
```
There is no warning if CINDEXTEST_EDITING is not set (more precisely if the
CXTranslationUnit_PrecompiledPreamble flag is not set). This happens with Clang
6.0.1.</pre>
</div>
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