<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Wrong diagnostic for undefined ELF temporary label"
href="https://llvm.org/bugs/show_bug.cgi?id=30988">30988</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Wrong diagnostic for undefined ELF temporary label
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>MC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>davide@freebsd.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>[davide@cupiditate bin]$ cat patatino.s
.text
jmp .Lblah
[davide@cupiditate bin]$ ./llvm-mc patatino.s -filetype=obj -o patatino
<unknown>:0: error: Undefined temporary symbol
The reason why this happens is that we don't have a SM location, as this error
isn't diagnosed until we reach the ELFObjectWriter.
```
if (Symbol.isTemporary() && Symbol.isUndefined()) {
Ctx.reportError(SMLoc(), "Undefined temporary symbol");
continue;
```
Couple of notes:
-> This used to be a fatal error, then it was converted to `reportError`.
-> GNU as doesn't seem to care about undefined labels, and assemble that
snippet just fine. The resulting assembly is:
$ objdump -t ./foo |grep blah
0000000000000000 *UND* 0000000000000000 .Lblah
$ objdump -d ./foo
0000000000000000 <.text>:
0: e9 00 00 00 00 jmpq 0x5
Rafael pointed out this is an area that could use some love, and pointed out
<a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Convert inline asm to MCInsts (nuke the pre-MC AsmPrinter)"
href="show_bug.cgi?id=23933">https://llvm.org/bugs/show_bug.cgi?id=23933</a></pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>