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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - -Wmissing-braces warns on braces missing in initializers expanded from macros in system headers" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24007&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=Yatrx_U49GtbepEgnA6YhlV5RtC5evksOLQYyVBnAxA&s=RyjwMA_QlZ3IuaxcVq3V08EVk5kjaY3-aeuhcEaTq_I&e=">24007</a>
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<th>Summary</th>
<td>-Wmissing-braces warns on braces missing in initializers expanded from macros in system headers
</td>
</tr>
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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
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>nicolasweber@gmx.de
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<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:
$ cat foo/a.h
#define REGISTRY_EXTENSION_GUID { 0x35378eac, 0x683f, 0x11d2, 0xa8, 0x9a, 0x00,
0xc0, 0x4f, 0xbb, 0xcf, 0xa2 }
$ cat test.cc
#include "a.h"
typedef struct _GUID {
unsigned Data1;
unsigned short Data2;
unsigned short Data3;
unsigned char Data4[8];
} GUID;
void f() {
GUID g = REGISTRY_EXTENSION_GUID;
}
$ bin/clang test.cc -c -isystem foo -Wall
test.cc:11:12: warning: suggest braces around initialization of subobject
[-Wmissing-braces]
GUID g = REGISTRY_EXTENSION_GUID;
^~~~~~~~~~~~~~~~~~~~~~~
foo/a.h:1:63: note: expanded from macro 'REGISTRY_EXTENSION_GUID'
#define REGISTRY_EXTENSION_GUID { 0x35378eac, 0x683f, 0x11d2, 0xa8, 0x9a, 0x00,
0xc0, 0x4f, 0xbb, 0xcf, 0xa2 }
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test.cc:11:8: warning: unused variable 'g' [-Wunused-variable]
GUID g = REGISTRY_EXTENSION_GUID;
^
2 warnings generated.
In real life, REGISTRY_EXTENSION_GUID comes from some Windows header, so
there's nothing the user can do about this. The warning shouldn't fire if the
rhs is a macro from a system header.</pre>
</div>
</p>
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