<html>
<head>
<base href="https://bugs.llvm.org/">
</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 - [lto] Module asm symbols don't show in IR symbol table"
href="https://bugs.llvm.org/show_bug.cgi?id=46502">46502</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[lto] Module asm symbols don't show in IR symbol table
</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>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</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>hans@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>For example:
$ cat /tmp/x.c
void foo() {}
asm(".globl bar \n"
"bar: \n"
" xor %eax, %eax\n"
" ret \n");
$ clang -c -flto=thin /tmp/x.c
$ llvm-nm x.o
---------------- T foo
I expected bar to show up in the symbol table. I can see it getting processed
by ModuleSymbolTable::CollectAsmSymbols() but it doesn't seem to make it all
the way?
But even though it's not showing in the symbol table, linking against it seems
to work:
$ cat /tmp/y.c
extern void foo();
extern void bar();
int main() {
foo();
bar();
return 0;
};
$ clang -flto=thin /tmp/y.c /tmp/x.c -fuse-ld=lld
$ ./a.out && echo ok
ok
Isn't the symbol table needed to resolve the 'bar' reference? Or does it
somehow work because we're linking the LLVM modules together anyway?
pcc: I can't really tell if this is a bug or if I'm missing something about how
this works.
If it is a bug, maybe the problem is how Builder::addSymbol() in IRSymtab.cpp
bails out because the symbol isn't a GlobalValue?</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>