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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Enhancement request: __attribute__((warn_untested_result))"
href="https://bugs.llvm.org/show_bug.cgi?id=33240">33240</a>
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<th>Summary</th>
<td>Enhancement request: __attribute__((warn_untested_result))
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>joe@perches.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
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<pre>Duplicate request submitted to gcc
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80522">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80522</a>
A possibly useful addition similar to:
__attribute__((warn_unused_result))
might be
__attribute__((warn_untested_result))
for things like allocation failures that
are not verified before use.
For instance:
void *malloc(size_t size);
could become
void * __attribute__((warn_untested_result)) malloc(size_t size)
so that
#include <stdlib.h>
struct foo {
int bar;
};
struct foo *alloc_foo(void)
{
struct foo *baz = malloc(sizeof(struct foo));
baz->bar = 1;
return baz;
}
The compiler could emit a warning on the set
of baz->bar as an intermediate test of baz
is not performed before any use of baz.
struct foo *alloc_foo(void)
{
struct foo *baz = malloc(sizeof(struct foo));
if (baz) baz->bar = 1;
return baz;
}
This variant would not emit a warning.
Similarly, alloc_foo could use that new attribute.
Martin Sebor also mentioned that non-allocation
functions like fopen could also use this __attribute__
mechanism.</pre>
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