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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - lld crashes when linking x86_64 Mach-O file"
href="http://llvm.org/bugs/show_bug.cgi?id=20539">20539</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>lld crashes when linking x86_64 Mach-O file
</td>
</tr>
<tr>
<th>Product</th>
<td>lld
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>release blocker
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>alexchandel@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12857" name="attach_12857" title="test.c, a harmless C file">attachment 12857</a> <a href="attachment.cgi?id=12857&action=edit" title="test.c, a harmless C file">[details]</a></span>
test.c, a harmless C file
For some `test.o`, compiled with `clang -c test.c`, running the command,
`lld -flavor darwin test.o`
fails with the following build output:
```
Unknown arch
UNREACHABLE executed at ArchHandler.cpp:46!
0 libLLVM-3.6svn.dylib 0x000000010ececf37
llvm::sys::PrintStackTrace(__sFILE*) + 40
1 libLLVM-3.6svn.dylib 0x000000010eced322 SignalHandler(int) + 248
2 libsystem_platform.dylib 0x00007fff975c95aa _sigtramp + 26
3 libsystem_platform.dylib 0x00007f9cfac00000 _sigtramp + 1667459696
4 libLLVM-3.6svn.dylib 0x000000010eced189 abort + 22
5 libLLVM-3.6svn.dylib 0x000000010ecdb673 LLVMInstallFatalErrorHandler + 0
6 lld 0x000000010e064149
7 lld 0x000000010e06a928
8 lld 0x000000010e06cccb
9 lld 0x000000010e04cca4
10 lld 0x000000010e055315
11 lld 0x000000010e04bbc0
12 libdyld.dylib 0x00007fff96afc5fd start + 1
13 libdyld.dylib 0x0000000000000004 start + 1766865416
Stack dump:
0. Program arguments: /usr/local/opt/llvm/bin/lld -flavor darwin test.o
Illegal instruction: 4
```
Only the flags `-flavor darwin` could be passed, because LLD did not recognize
the `-target` flag when it was passed, nor did it work without the `-flavor`
flag.
This is using the lld HEAD, llvm HEAD, and clang HEAD, 2014-07-05, (llvm
3.6.0pre). However I saw this same error at least a month ago.</pre>
</div>
</p>
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