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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 --- - Need to disable most libc library builtin optimizations when SEH is present" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24009&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=C4XGHNWGWXwjdl9q1Sp3sftz43_pR3H33ieZgPKPGcA&s=Ozhj37YEmebms8t4WX5-Gdo7NO1X1BUjTBf84RWf2IA&e=">24009</a>
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<th>Summary</th>
<td>Need to disable most libc library builtin optimizations when SEH is present
</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>Windows NT
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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
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<th>Component</th>
<td>LLVM Codegen
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>rnk@google.com
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<th>CC</th>
<td>david.majnemer@gmail.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This program crashes instead of exiting zero:
#include <string.h>
bool try_memcpy(void *d, void *s, size_t n) {
__try {
memcpy(d, s, n);
} __except (1) {
return false;
}
return true;
}
int main() {
return try_memcpy(nullptr, nullptr, 42);
}
This is because we codegen memcpy to llvm.memcpy instead of emitting the
libcall. We don't support invoking most intrinsics, so for now we should
probably behave as if -fno-builtin was set in functions that use SEH.</pre>
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</p>
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