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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - lldb/mac can't load object files from thin archives"
href="https://bugs.llvm.org/show_bug.cgi?id=50770">50770</a>
</td>
</tr>
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<th>Summary</th>
<td>lldb/mac can't load object files from thin archives
</td>
</tr>
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<th>Product</th>
<td>lldb
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<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>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>lldb-dev@lists.llvm.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>jdevlieghere@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>lld/mac and llvm-ar support thin archives (where the .a file just stores an
index of symbols and then links to .o files on-disk for data).
Thin archives confuse lldb:
% cat foo.c
#include <stdio.h>
void foo() { printf("asdf\n"); }
% clang -c -g foo.c
% cat mainfoo.c
void foo();
int main() { foo(); }
% clang -c -g mainfoo.c
## -T here makes llvm-ar create a thin archive:
% rm -f libfoo.a && out/gn/bin/llvm-ar -rcsDT libfoo.a foo.o
% out/gn/bin/clang -fuse-ld=lld mainfoo.o libfoo.a
% lldb a.out
(lldb) target create "a.out"
Current executable set to '/Users/thakis/src/llvm-project/a.out' (x86_64).
(lldb) b main
error: libfoo.a(foo.o) failed to load objfile for
/Users/thakis/src/llvm-project/libfoo.a
This works fine with a non-thin archive.
(Remember to rm the .a file before re-running llvm-ar since the thin archive
flag seems to be sticky.)</pre>
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