https://sourceware.org/bugzilla/show_bug.cgi?id=22266
Bug ID: 22266
Summary: ld.gold produces invalid output when linking with
--relocatable
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: bgamari at gmail dot com
CC: ian at airs dot com
Target Milestone: ---
I recently noticed that the Glasgow Haskell Compiler would break when built
with split sections enabled. After a long process of debugging
(https://ghc.haskell.org/trac/ghc/ticket/14291), I found that the cause is that
ld.gold produces incorrect output when producing relocatable object files.
To demonstrate the issue I put together a small reproduction case fo build anr
amd64 here: https://github.com/bgamari/T14291-repro.
The testcase consists of three object files taken from a GHCd a linker script.
When linked with `ld.bfd -r` the testcase produces the expected output.
However, when `ld.gold -r` is used the resulting object file appears to be
mangled. Specifically, the input object `Err.o` contains the symbol,
$ objdump -D Err.o | grep -A6 '<r1Cy_closure>'
0000000000000000 <r1Cy_closure>:
...
10: 03 00 add (%rax),%eax
12: 00 00 add %al,(%rax)
14: 00 00 add %al,(%rax)
...
Whereas the output object produced by `ld.gold` contains,
$ ld.gold --version
GNU gold (GNU Binutils for Debian 2.28) 1.14
Copyright (C) 2017 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later
version.
This program has absolutely no warranty.
$ ld.gold -r -T merge_sections.ld -o out.o Concurrent.o Base.o Err.o
$ objdump -D out.o | grep -A6 '<r1Cy_closure>'
0000000000001548 <r1Cy_closure>:
...
There is no other symbol named r1Cy_closure in any of the other linked objects.
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