<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/147181>147181</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Android][cross-compile][glang][gdb][BFD:unable to initialize decompress status for section .debug_loclists]
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          xiaoqiang-wang
      </td>
    </tr>
</table>

<pre>
    Hello,
I'm an **Android-Source-Code** and **ARM-GPU-DRIVER-Source-Code** user.
When I try to use default compile tool-chain **clang-18.0.1** (prebuilts/clang/host/linux-x86/clang-r522817/),
**There is something wrong**,
I  can NOT use **gdb** to debug the **clang-18.0.1** generated ELF file.

When I update from **clang-18.0.1** to **clang-19.0.1**(prebuilts/clang/host/linux-x86/clang-r536225/bin/clang), the problem still exist.


I sincerely want yours can kindly help me about below **Question_1** and **Question_2**.

===
===
1.Currently, the **GPU-DRIVER-Source-Code** can be compiled and used in the **Android-Source-Code** successfully, and It's output the **malisc_host** ELF file.

2.But when I try to use "**gdb malisc_host**" command to debug, It show below error message.
```
Android_15$ gdb  ./malisc_host
    BFD: malisc_host: unable to initialize decompress status for section .debug_loclists
    malisc_host: not in executable format: file format not recognized
```

3.But the **malisc_host** can be debug by latest l**ldb-21.0.0** tool.
```
lldb ./malisc_host //OK it works
```


4.The the output binary file **malisc_host** can be debug by **lldb**, but can NOT be debug by **gdb**.
                4.1. **But the lldb is not a powerful tool, It can NOT stop on my added breakpoints**.
                4.2. **So, I strongly want to use the **gdb** to debug the **malisc_host** ELF**.



5. And when I use the **readelf** command, it output below Warning message.
**Warning message .debug_str unsupported compress type: 2**

```
Android_15$ readelf -p .comment out/soong/.intermediates/product/malisc__host/linux_glibc_x86_64/unstripped/malisc_host
readelf: Warning: section '.debug_str' has unsupported compress type: 2

String dump of section '.comment':
  [     0]  GCC: (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3
  [    2a]  GCC: (GNU) 4.8.3
  [    3c]  Android (11967740, +pgo, +bolt, +lto, +mlgo, based on r522817) clang version 18.0.1 (https://android.googlesource.com/toolchain/llvm-project d8003a456d14a3deb8054cdaa529ffbf02d9b262)
  [    f3]  Linker: LLD 18.0.1
```
Above **readelf** command output the warning message: 
5.1.  I think in the **clang** generated ELF 's file header,
             There must be something's **version** or **format** UN-Match with **gdb**'s expectation.
             that lead to **gdb** can not correctly recognize the **malisc_host**'s format.


**Questions_1**
===
Q1.1  Does this message  mean the **malisc_host**'s file header have be corrupted by **clang**,
           or **clang** give a different value to the **malisc_host** ELF's **debug_section**.
 Q1.2  How can we fix this error? and make **gdb** can debug the **clang**‘s output ELF **malisc_host**?
 Q1.3  Is this error that is an already known problem in **clang-18.0.1**/**clang-19.0.1**?



**Below is my Machine info**
===

1.The system's  is Ubuntu 20.0.4
```
Android_15$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.6 LTS
Release:        20.04
Codename:       focal
```

2.The **clang/clang++** used to compile **Android-Source-Code** is 18.0.1.
```
Android_15$ ./prebuilts/clang/host/linux-x86/clang-r522817/bin/clang --version
Android (11967740, +pgo, +bolt, +lto, +mlgo, based on r522817) clang version 18.0.1
 (https://android.googlesource.com/toolchain/llvm-project d8003a456d14a3deb8054cdaa529ffbf02d9b262)
Target: x86_64-unknown-linux-gnu
Thread model: posix
```


3.The **gdb** used to debug is 9.2:
```
Android_15$ gdb --version
GNU gdb (Ubuntu 9.2-0ubuntu1~20.04.2) 9.2
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
```


4.But when I use the default tool-chain **clang-18.0.1**(prebuilts/clang/host/linux-x86/clang-r522817/bin/clang++),  compile a simple **hello_world.cpp**,
  the output ELF **a.out** can be debug by **gdb** tool.
```
Android_15$ ./prebuilts/clang/host/linux-x86/clang-r522817/bin/clang++ hello_world.cpp -g
Android_15$ gdb -tui -args a.out //OK the gdb work correctly.
```


**Below is my ```file``` command's output for each ELF file.**
===
1. clang's info:
```
Android_15$ file  ./prebuilts/clang/host/linux-x86/clang-r522817/bin/clang++
clang++:
ELF 64-bit LSB executable, x86-64, version 1 (SYSV),
statically linked,
Go BuildID=CaRjX2xOY2sn3Eu50jD5/sx0sdGGnrBuwdu7dEfC8/RbpQ82--tce2MQnXDd-h/BpbhCXNCzLlerptoXX1D,
with debug_info,
not stripped
```

2. malisc_host's info
```
Android_15$ file ./malisc_host
./malisc_host: 
ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), 
dynamically linked, 
interpreter /lib64/ld-linux-x86-64.so.2, 
for GNU/Linux 2.6.24, 
BuildID[xxHash]=300f2d32f4dbacdf, 
with debug_info, 
not stripped
```

3. a.out's info:
```
Android_15$ file ./a.out
a.out info:
ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV),
dynamically linked,
interpreter /lib64/ld-linux-x86-64.so.2,
for GNU/Linux 3.2.0,
with debug_info, 
not stripped
```
 
4. gdb's info
```
Android_15$  file /usr/bin/gdb
/usr/bin/gdb:
ELF 64-bit LSB pie executable, x86-64, version 1 (GNU/Linux),
dynamically linked,
interpreter /lib64/ld-linux-x86-64.so.2,
BuildID[sha1]=f5f8723dbedf08022a36e8449e29e717e6547316,
for GNU/Linux 3.2.0,
stripped
```

5. **readelf ./malisc_host** error message **.debug_str unsupported compress type: 2**
```
Android_15$ readelf -p .comment ./malisc_host
readelf: Warning: section '.debug_str' has unsupported compress type: 2
String dump of section '.comment':
  [     0]  GCC: (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3
  [    2a]  GCC: (GNU) 4.8.3
  [    3c]  Android (11967740, +pgo, +bolt, +lto, +mlgo, based on r522817) clang version 18.0.1 (https://android.googlesource.com/toolchain/llvm-project d8003a456d14a3deb8054cdaa529ffbf02d9b262)
  [    f3]  Linker: LLD 18.0.1
```

Questions_2
===
I see the **version** info between **malisc_host** and **a.out** is different.
```
./clang++          : no version info.
./malisc_host     : for GNU/Linux 2.6.24,
./a.out                : for GNU/Linux 3.2.0,
/usr/bin/gdb     : for GNU/Linux 3.2.0,
```

Q2.1  Why did the **malisc_host**'s have a different **version** info?
Q2.2  The **malisc_host**'s  **version** info generated base on what?
Q2.3  Did the "gdb malisc_host: BFD: can not recongize" error message,
         caused by the **gbd** and **malisc_host** have different **version** info?
Q2.4  For make **clang** generate a **malisc_host** switch it's **version** from **GNU/Linux 2.6.24** to **GNU/Linux 3.2.0**,
         Can we specific a **version** info for **malisc_host**,
         or we need replace some link-libarary for the **malisc_host**?
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzsWklz2zj2_zT05RVZJKj14IMsRW7X33E6dtJJn1wgCYroQAT_AGhJOcxnn3oASVGbnfRSU1M1Lh0kYnn77y001ZqvSsauveGNN1xc0doUUl1vOZX_z2m58je0XF0lMttd_8KEkB6Ze-HsziPjNdASPDLzyGxWZkryzH-StUqZP5cZcwtAy6zd8_jev_31s794vPvt3eOZrbVmKvDC2ZeClXAHRu3ASHwKGctpLQykcl1xwcBIKfy0oLylnwrkNJoEYRA1t3lkUimW1FwY7ZGl3eGRZSG18chS8LLe-tvJqF3y1ZCQSTT2yNIjUyeku-lTwRQDrkHLNTMFL1ewURIvcxusOgBSWsLDh0-WX7e0ypKGFyMhY0m9AlOwyxyvWMkUNSyDd_dLyLlgqI29Quoqo4ZBruT68iVGHq5N92s_r5F4RMjQI8uEl_sDqBwrSKVkItgatOFCANtybRqGrUY0L1OmmNjBhpYGdrJW2mrpGy8zsYOCiQrWDGgiawMJE3LTsP6xZtpwWT5HJ07ULRH3uyUYL5rP4fcomNdKsdKIXcu1O_eqIyKTCWu9LbPka80y4GXviss-r-s0ZVrntXBk8fyd8chYg6xNVZveLWsquE6fnRHs6SPjk-CmNrA5iQmPkM7N4OQWjxDkf42kW-9DVu4M6EJuGnUzpaSCNdOarhy9Udh8wla-52jokQEgFQg8suyTCmcAADfLhRfPDniIZ1CXNLGhCrzkhlPBv2Mgo1IV0xq0oabWkEsFmqVoUwgsm89CpoJro5vrj-4tpUE7sC1La2NJ5FKtqV1DtTU_7T7FUrkq-XeWHcnmhbPY6vU1QzRu4CI32YGghmkDwi2LLPFJFIRB2EWeFMc6FCJLjrUGFmKWH_4PuIGNVN_0KXNeOBsEnwpm-Wt8JuElVTsn44-y3LAqWiRCF0hq04HV6d4OtJz7Tb1wOgiioFltVWbl4toqmUIlN0zltbAqaLyspaCNrECWsN4BzTKWQaIY_VZJXiIIHRMiLaEnae8BbRBqWwxpXH9vtFch9mxoHcKG_QwDmJVZG2KHBBSjGRN5q14XUcgaN51dbCh9oarE1NAPJnvoaKF1cm0U1KWuq0oqhPwuLsyuYujLTXQ3XF6My4ZB8CsIkD1WWsY8stTSJqllwEvD1JplHP3XI8tKyaxOzd4rn_sp4HkleJI-byej59HAI8u61EbxqmLZSfC3yolnrfj4tY1mj4z3snpkDAXVb4lshX0yChWW1esKZH5wXyOhR8ZePLP44A1vECQg9IYLgNv5HC_yyORzUpem9sjyHsNGwiAYB7Ef1fZx5JGpe9K_g9CjO24fPruNk8ONcWo3NobAnVE0HY3HgxA9wyM31Uo23xIpTPNVmPbhWrj1hGJSkSV0tccUbJKFF6Y0yuxSO1IojKk0Cm3BgzrSwUrKlWDaZiBUjkeWGIO2NEKDipe1Xyn5B0sNZJMwjOlgOMqiAY0zlkzC4SDNKB2SaZ4neUiyaUJGBDN8T9g8tsLe8_IbU6iY-_tFw9exYyby5dW46We_zWFYWI1jKEYBYJ4rePntMN021ceZSskmVguLBVJVriSD_p-r4da1xnDdF3L2pLuz0XhDQKrmcZNb3NPPD_57atICNtwUxwhk72LbiqWGor8GxzyYghoQjGb7Gm0PXwiXCKapVIqlRuz2ues1RHOiWx57kHZQKem2ijoqjT5GQQSwkEyjtnWHT7BmtHyb5l7dUNAX5uolpeoKrdJlk57RTqzS6fjAsvyFAYWM5znDug1eqKhtFfEmrnembEDHwcYe7-FjFBCAX-TGanvDIOdbJ7utg7x4aSu1Nf12ml7wxNkSvhHuHfEmoTeddBWec8zzCoyXDTsxwJ3useB8hGtsrKjAGNrBt1Juyq7WfqXjschwofK3FI8c5MbmLbT8Dt7TtOAlA17m8qy32FoaCxK904atrbbxrINZIGEQBoNXE5XQybNiglHNwKdeOHuQcP90A2uZ1YJpoIoBfaFcYE2H9lpwTDxJbaSCO1thNpgezhZMp4pX1r6x9akeH4NgBPefnrxw9ujINVssxOO6F86wWC_pureUy5SK00KMWKEP7N32QTf203auNqrb_vStBoHrBkFfr7kDm6z_VA_b69jA91tw6wj88zkLPfw_kLY-UbVithdwBYxflzaAfKesVYnu86nA0ELPYwK3VlLz7dkiPO6Zfw8GrbkdIHAN04C4euT1_qlviNuHz_ZZV6rgJX7Y1Cf_co6MQtnL0WOrneKrAtuHyRyfk5CEsFSMwZPMzQbjZynrMqMO9uZwV6boX_c8ZaVmcPvr_UuMPhvPAKnf_nrf2SxGNMb-RoEXz9Fonc1WZR1ItbL-Zi9CT1xVIijMWnjxO6tPrlENOTKjG2aQzE7WNq7tAsZHQcsVsyirWNbGNwNus1c3aHn4AF9mj4-zh0-_267dgT_bGkwIFVNrbposI-jmOITa7qnXNbclfTtG-oHx0Z-fHh3MShxG2IlJBw4UNF9XHUoUTAj5vJFKZEFaVYfJstf-7RMKDWyB_0rD12-LTpvSfwJknKhwJAz4q_OBYGoOPlUrDVaYfUuMAuMO7Iv3xdB5G5-msW4Plifdj33bth_A5FIBo2nRm7acS3tRAI14Y-2S4xthbuuiv1WnXjjr_7L0kenRwE-4sSl0PwtBR9tORj52bvM9IiNmPP3-9Fs32dRYo6ZUiB0ILOwz9_hWwk3NRYbpdjGnj398JdsPvxNdxu_qYfjHYoht5TbU2e1tqW7qTVaPs3f5fOKR5WNSfZwQ3zcpI-8_ll8XmV94ZHlTJcX868P8-71gqjLy69do4WjZGtqVaq7qwIdYAnft5plkfDjoam3ypkFO51bHT1z7caTXirOf1S3eku1Kuj7WLi7YRrxSzMIsukFiO2yR-Z1H-KNBoCUCvz2Bbmq7UGxj6y2QYBSQQbPYmmp4s93-QnXhDdFscRjmJItJPsgSmmZ5s_lU3fCmvuMAGqz5Ge9H1bpjoYOq3tG_ruBL-v1p9Z7RbhyQILzknW-oC2zSAYu8P-KX7RxvWWvVhT2eRlw7efiXlNcT8e_X4d4JdUEj54L5MJ-MSZwlLMvDSUgIjUdsMhhMGZmycTRmo-FgHEejN61w2TWHweGg4STEXfo7GHA3J_7EAO6npm-nYPNPzMn-NyT77xySeWFvMkOOyo070Kw_7zkcSiGmQMLMhrHy4ihk_6qsXyZyvR-pHBdTwVEN1_25ty2dmpF8cJo6u60Xc1VzxuWCo79zB3sAcAqFP3TqSN8kiAC-FDvIePbmZMtOs_oTqEumcEOVjyQgdr746qWX7bkfZaKjo59vCmq6u2OARcc0OX7VF8_al2_t_FCxVJYr_p15hByi39H8LaW2i012_bcpSXbiRaceZhX0E-oZACyRjf1Y7dwoF-hFgnrDTVoANxfHtb1X4uc88PDF-BmnOTOfnLsRoa5YynOeduydMWHeTTLPGP_gUqnwzpIx7H8rQVM3i7YZ2Bc8ocq-4bODwMsOFS-vsus4m8ZTesWuo_EwGk8H8TC8Kq4jmtMojccjMsijKGQZHcXjNKJkMh2Ok2F6xa9JSIbhOByF05jEYUDSOBuzQU4GUzrOk4k3CNmachEgLGLjf8W1rtl1NBhHk-hK0IQJbf9XhJCSYeOla3Q2b7i4UtcWS5N6pb1BaN_h7q8x3Aj7TyZNRsBSYXiTKqm137TG7tHKeof7miXui_Pyv-GV8nBxVStxfZgoVtwUddKkBmT4KCt4ZGnFxFau0cPLNfl3AAAA__-fP4fl">