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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - malloc is optimized out for release build"
href="https://llvm.org/bugs/show_bug.cgi?id=28416">28416</a>
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<th>Summary</th>
<td>malloc is optimized out for release build
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.8
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</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>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>dmarkman@mac.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>the following code behaves incorrectly
int main(int argc, const char * argv[]) {
size_t need_size = 0x1000000000000;
void *data = malloc(need_size);
if(data == NULL) {
printf("data == NULL\n");
return 1;
} else {
printf("data != NULL\n");
}
free(data);
return 0;
}
it returns
data != NULL
Program ended with exit code: 0
but it should return
data == NULL
Program ended with exit code: 1
gcc handles that situation correctly
clang shouldn't optimize it out, because result of the malloc is used and
caller of my program relies on the exit code
Note, clang flag -fno-builtin prevents clang from malloc optimize out
and solve the problem.</pre>
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