https://llvm.org/bugs/show_bug.cgi?id=30988
Bug ID: 30988
Summary: Wrong diagnostic for undefined ELF temporary label
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: MC
Assignee: unassignedb...@nondot.org
Reporter: dav...@freebsd.org
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
[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
https://llvm.org/bugs/show_bug.cgi?id=23933
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