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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 --- - Broken module (piece is larger than or outside of variable) with -g and -flto"
href="https://llvm.org/bugs/show_bug.cgi?id=24923">24923</a>
</td>
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<tr>
<th>Summary</th>
<td>Broken module (piece is larger than or outside of variable) with -g and -flto
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>russell_gallop@sn.scee.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following example has an ODR violation. It compiles okay without -flto or
without -g but with both a broken module is reported.
$ clang --version
clang version 3.8.0 (trunk 248463) (llvm/trunk 248476)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ cat a.cpp
struct P {};
void foo() { P l; }
$ cat b.cpp
struct P {
int a;
int b;
};
P fn1() {
P r;
r.a = 0;
return r;
}
$ cat test.sh
#!/bin/bash -e
clang -O2 -g -flto $1 -c -o a.o
clang -O2 -g -flto $2 -c -o b.o
llvm-lto a.o b.o
$ ./test.sh a.cpp b.cpp
piece is larger than or outside of variable
tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !24, metadata
!32), !dbg !31
!24 = !DILocalVariable(name: "r", scope: !20, file: !12, line: 6, type:
!"_ZTS1P")
!32 = !DIExpression(DW_OP_bit_piece, 0, 32)
LLVM ERROR: Broken module found, compilation aborted!</pre>
</div>
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