<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/66738>66738</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            lld/ELF -r: implicit addends in .rel.debug_* are incorrect if --compress-debug-sections={zlib,zstd}
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            lld:ELF
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          MaskRay
      </td>
    </tr>
</table>

<pre>
    https://reviews.llvm.org/D48929 implemented `-r` for non-SHF_ALLOC sections for REL targets, but it does not handle `.debug_*` sections when `--compress-debug-sections={zlib,zstd}` is used. The following test demonstrate the problem:

```
# RUN: llvm-mc -filetype=obj -triple=i686 %s -o %t1.o
# RUN: ld.lld -r -o %t1 %t1.o %t1.o
# RUN: llvm-readelf -r -x .bar -x .debug_line %t1 | FileCheck %s --check-prefixes=REL,REL0

# RUN: ld.lld -r --compress-debug-sections=zlib -o %t1.zlib %t1.o %t1.o
# RUN: llvm-objcopy --decompress-debug-sections %t1.zlib %t1.zlib.de
# RUN: llvm-readelf -r -x .bar -x .debug_line %t1.zlib.de | FileCheck %s --check-prefixes=REL,REL1

# REL:       Hex dump of section '.bar':
# REL-NEXT:  0x00000000 01000000 00000000 02000000 04000000 ................
# REL0:      Hex dump of section '.debug_line':
# REL0-NEXT: 0x00000000 01000000 00000000 02000000 04000000 ................
## FIXME: The implicit addends for the second input section are wrong.
# REL1:      Hex dump of section '.debug_line':
# REL1-NEXT: 0x00000000 01000000 00000000 01000000 00000000 ................

.long 42
.data
.long .text + 1

.section .foo
.byte 0

.section .bar
.dc.a .foo + 1
.dc.l .text

.section .debug_line
.dc.a .foo + 1
.dc.l .text
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJysVVGPmzgQ_jXmZQQyhkB44GGbBPWktCflelLfKoOHxFuDkW26SX_9ySQku81u1apnRbHHzHzzzXjs4dbKfY9YksU7slgHfHQHbcoP3H7d8VNQa3EqD84NliQPhFWEVQa_SXyykVLfukibPWHVOl0WrADZDQo77B0KIBkNDckotNpAr_vwn_fVl4ft9u8VWGyc1L2dPu02W3Dc7NFZwlZQjw6kA6HRQq8dHHgvFHq0SGA97r8Q9uBRrxhPB-wnZ2Gju8GgteGkGM4aJFmT_N13JWvCVt-tEyRfewRpYbQoIvh0QGi1UvpJ9ntwaB0I7HRvneEOwR0QBqNrhZ1PAV0TOv9n9PI7iyyB3b8fSfIAPjVh10DYSoXuNCBJ1rp-hNAZOSgvyWyZAWELC6H2s4sjfQ8jIqUEhOaqNKu-beI9G-QCVTsZHiGq-Xk-J1DJHmewfAWVVLg6YPP1wiZsvBAOBlt5RJ-93WZL2Gq32dIXwb9K8yeH4E_gFuwk_VIwun5s9HCCMBT4Bvo9pl9GAv8oPTPI76YpvkvTZut9n8d7PIIYuwF0OxcxEJZ7FoTltwo724UfN58_Tcb0SC8DaDwvrjtsXqSXRfTDeIFKr3TeYnPLxSuk6JXV_0XKA1d_ff6w8aD-PvqXRDbSARcCe3F-KvxNtNjoXoDsh9FdGXOD8GR0v38ZZvxnYca_GObdzhthTv-R0v0eUnaRBHf8-YfI4dEBYe_gRRVFM-mo1ZdrEtUnh0Bf1_LFdHHQRHyyeg7qd9XZ1-v2z_LyWzDzgxiIMhFFUvAAyzgrFjFlcZ4Fh3LJslQ0MbY1bfNWxJy3i6WgRdouiniZZ4EsGWUJLeKCLlK2yKK6iBPG8pSlBS2aeklSih2X6tp-AmntiGWW5ckyULxGZadexphSgiQPm21FGPOtzZTT9a_HvSUpVdK6WxMLnHQKS2_Cqs22gtD4k7-rQ9lDZFDdmtFUfLJvtDHYOJDtTx_Bu04UjEb90F_30h3GOmp0R1jl-V2mcDD6ERtHWDWFbAmrpqj_CwAA___kQzr_">