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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 --- - -Wheader-guard fires for non-header files"
href="http://llvm.org/bugs/show_bug.cgi?id=17053">17053</a>
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<th>Summary</th>
<td>-Wheader-guard fires for non-header files
</td>
</tr>
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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>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider this code:
$ cat test.h
#ifndef TEST_H_
#define TEST_H_
#ifdef CONFIGURE_TEST_INCLUDE
typedef int MyInt;
#endif // CONFIGURE_TEST_INCLUDE
#endif // TEST_H_
$ cat test.c
#ifndef EXCLUDE_C_FILES
#define CONFIGURE_TEST_INCLUDE
#include "test.h"
int main(){}
#endif // EXCLUDE_C_FILES
Here, the .h file has a correct header guard and does some stuff optionally
based on a define. The .c file is guarded by some preprocessor macro, so that
the file can be disabled at build time.
-Wheader-guard complains about the .c file:
$ ~/src/chrome-git/src/third_party/llvm-build/Release+Asserts/bin/clang -c
test.c
test.c:1:9: warning: 'EXCLUDE_C_FILES' is used as a header guard here, followed
by #define of a different macro [-Wheader-guard]
#ifndef EXCLUDE_C_FILES
^~~~~~~~~~~~~~~
test.c:3:9: note: 'CONFIGURE_TEST_INCLUDE' is defined here; did you mean
'EXCLUDE_C_FILES'?
#define CONFIGURE_TEST_INCLUDE
^~~~~~~~~~~~~~~~~~~~~~
EXCLUDE_C_FILES
1 warning generated.
...but the .c file is fine as is. -Wheader-guard shouldn't warn about wrong
header guards in the main translation unit.</pre>
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