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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Constant folding incorrectly folds modifiable compound literal"
href="https://bugs.llvm.org/show_bug.cgi?id=39977">39977</a>
</td>
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<th>Summary</th>
<td>Constant folding incorrectly folds modifiable compound literal
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>miscompilation
</td>
</tr>
<tr>
<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
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hstong@ca.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>In the following, Clang appears to ignore the modification of the array
element; this, in turn, leads to a call to `abort()`. The GCC-built executable
returns 0 as expected.
### SOURCE (<stdin>):
extern "C" void abort(void);
constexpr int *p0 = (int []){ 13 };
int main(void) {
*p0 = 42;
int x[*p0];
if ((sizeof x)/sizeof(int) == 42) return 0;
abort();
}
### COMPILER INVOCATION:
clang++ -xc++ -std=gnu++11 -o testit -
### INVOCATION OF RESULTING EXECUTABLE:
./testit
### ACTUAL EXECUTION OUTPUT:
Aborted
Return: 0x86:134
### EXPECTED EXECUTION OUTPUT:
Return: 0x00:0
### COMPILER VERSION INFO (clang++ -v):
clang version 8.0.0 (trunk)
Target: powerpc64le-unknown-linux-gnu
Thread model: posix
InstalledDir:
/gsa/tlbgsa/projects/x/xlcmpbld/run/clang/main_trunk/linux_leppc/daily/latest/bin
Found candidate GCC installation: /usr/lib/gcc/ppc64le-redhat-linux/4.8.2
Found candidate GCC installation: /usr/lib/gcc/ppc64le-redhat-linux/4.8.5
Selected GCC installation: /usr/lib/gcc/ppc64le-redhat-linux/4.8.5
Candidate multilib: .;@m64
Selected multilib: .;@m64</pre>
</div>
</p>
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