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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 causes -Wheader-hygiene false positives"
href="http://llvm.org/bugs/show_bug.cgi?id=18948">18948</a>
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<th>Summary</th>
<td>-frewrite-includes causes -Wheader-hygiene false positives
</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>
</tr>
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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>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>mostynb@opera.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>Using -Wheader-hygiene with output from -frewrite-includes -E gives a false
positive "using namespace directive in global context in header" warning.
Minimised testcase:
foo.h:
void foo();
foo.cc:
#include "foo.h"
#include <string>
using namespace std;
void foo() {
string s("42");
}
To trigger the false positive:
clang++ -frewrite-includes -Wheader-hygiene -E foo.cc > tmp.cc
clang++ -frewrite-includes -Wheader-hygiene -c tmp.cc
This output is shown:
In file included from tmp.cc:1:
In file included from <built-in>:1:
foo.cc:3:17: warning: using namespace directive in global context in header
[-Wheader-hygiene]
using namespace std;
^
1 warning generated.</pre>
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