<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/147446>147446</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [ELF][debug_section][gdb vs lldb][readelf vs llvm-readelf][Does LLVM customize ELF's debug_section]
        </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/),
compile the **ARM-GPU-DRIVER-Source-Code**,  
the **clang-18.0.1** can compile the **ARM-GPU-DRIVER-Source-Code** , 
and  generate the ELF **malisc_host** file successfully.

But, **there is must something goes wrong**,
I  can NOT use the **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 your can kindly help me about below **Question_1** and **Question_2**.



---
gdb vs lldb
---

1.1 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
```

1.2 But the **malisc_host** can be debug by latest **lldb-21.0.0** tool.
```
Android_15$ lldb ./malisc_host //OK it works
```


1. 3 The the output binary file **malisc_host** can be debug by **lldb**, but can NOT be debug by **gdb**.
                a. **But the lldb is not a powerful tool, It can NOT stop on my added breakpoints**.
                b. **So, I strongly want to use the **gdb** to debug the **malisc_host** ELF**.

----


readelf vs llvm-readelf
----

2.1. And when I use the Unbuntu's **readelf** command, it output below warning message.
**Warning 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
```


2.2.  But when I try used the llvm tool-chain **llvm-readelf**, it not report any warning.
```
Android_15$  llvm-readelf -p .comment ./malisc_host
String dump of section '.comment':
[     0] GCC: (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3
[    2a] GCC: (GNU) 4.8.3
[    3c] Android (12701618, +pgo, +bolt, +lto, +mlgo, based on r536225) clang version 19.0.1
            (https://android.googlesource.com/toolchain/llvm-project b3a530ec6537146650e42be89f1089e9a3588460)
[    f3] Linker: LLD 19.0.1
```

Above **readelf** command output the warning message, and **llvm-readelf** not output any warnings,
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.

---  
Q1:Does this means LLVM customize the ELF's debug_section, 
that lead to **gdb** can not correctly recognize the **malisc_host**? 
Q2: How can I fix it? and make **gdb** can debug the  ELF **malisc_host**?
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJy0WF2Tm7jS_jXyTReUEGDMhS-YcZydeifZd5Od3cuUANnojEAcSYzH--tPSQjjj8lssnVOKhdGH61-Ws_T3RqqNd93jK1ReofSzYIOppFq_cqp_Den3T440G6_KGV9XP_ChJCI3CNcPCCStUA7QKRApCi6WkleB1_loCoW3MuajRNAu3pa8-VT8PH_n4LNl4c_Pnx5Y-mgmQoRLv5sWAcPYNQRjLSjULMdHYSBSrY9FwyMlCKoGsqn8ythPY1WIQ4jbw2RVa9YOXBhNCJbtwKRbSO1QWQreDe8Bq-r5TQVqJSQVZQhskUkH0GejmvYD2JA5B4A4WLe8YZnFe3g502DtY1wYQMKe9YxRc24_8Pj1ttoqeC6-jZidJt29hA9VBXTejcIcbQBRri4G4yz51aZhikGXEM7aANatsw0vNvDXjINByVt4Dw6e_XgEHz-9Xd3NzOCfV36U42EmpXDHt6NwwSidgisp945T4Chry3EnZLt940YeTmXz3M_z4B4SUiKyLbk3bzBksEB6ZUsBWtBGy4EsFeujXfYRUXzrmKKiSMcaGfgKAflAvXMu1ocoWGih5YBLeVgoGRCHrznvw1MGy67b9GNZk5TZPyez0O4CIIAYRt1eNEgRF2exhAuojCCWyEhQk53BTdsQYRYYrb2_OkKLfgHA7qRB-80U0oqaJnWdD_e2BL7_3hKBN-iFJEE7CkQIrI9PwoXAAB32w2Kiwsf4gKGjpZO38A7bjgV_C-rfqsWxbQGbagZNOykAs0qGxkInZvfhKwE10Zb81dGO2mAd8BeWTUYZ38nVUvdnNPH-OnWKVbJfcf_YvUVMBdSAneDOSP1rd7shZfMs788gqCGaeOX2zsKSBTiEJ_YK8X7IbR7rkMILkltf_0_4AYOUj3rW2edvxDD780oUTmY3vKOd1QdR9g_imF2fk5y5WBOWeB27SkTjHzNEc5p6OemCDpgXLuoU-jlgandIFxEPOcm-9rIHmQH7RFoXbMaSsXocy95Z3V9eUw5HfNVOiugjc1fkyi9DH4wZ92G5sPj9kKIwUlvCBeK0ZqJ3ajGlzbw3xfLSBiFUHQ1HHyO8948deXQmQGRTPvDp93-TkZZWkzcnC7T6fFAVWez9bki3aY_LycmpWijYOj00PdS2eR7Epc59sxqwqcIj-u7zJzgBj2E1j3WmTe0PsGIC_D-2J-TeBHJZq8QyaCh-u-cc259NcpCq4e2B7m7sOd9QSRDceGyDUrvbMoBjNINwMf7e2sIkdWTj_n20apCQhJmYRxEgxuOEMnHkXMbhF7Z-Pj5aVy4OlsYV26Vj5ddFkX5MssSPBbdu34v_a9SCl-J74SZBlsxzpdUs9pS_9Sc5OCqErwwpS1gXwux86UxptcWtEsPdDw93Eu5F0y7fsIGB5GtFZlrn2wdtFTtlfwXqwzUK4xjmqTLOkpoXLNyhdOkqilNSb7blTtM6rwkS2Kr4llUdrHD-8i7Z6ZsYB4fN7Nrt5mJhCQEl0sPc4kaLNYxM7y0ty3ehaROeYhPadvyBWh3nOTwfla9EOjfMPgnqHZBtH_CswuWfZdkftXIsnOSkQxHy2j1j0nm-58bkuUTyc7-_Vf4VsY0jTGrlmmcRclymWKWkJKt8l2EVznLaZyuVskSj3y7YNsV2fK3yVaU8oW9l1GnXGqJd5VJbXDmVuyWf455fvsZ8_TUJtsm-tl2Hldd8Jvtr8v8riw39gw1Ghk7c9eWl2zuzM_KhL8jb1MqP-w7nHH06XPwiZqqgQM3zXXhc7bYa88qQy2xQ3csNSAYref2ei6Utixb5JVUilVGHOem6b3aOQJ0bs3F0z2WfotQXGzsW8M09hHCaKfh8fGPT1AN2sh2MuyKb6bBF4xRh_5V9D_xON4694gl2S_y4Ow8wI6_Ajd20pKjpc-3vYRdODcT7z3QULxd1Ou4zuOcLtg6ytIoT3Ca5ItmTXNapmlSEpyncZ1XVV7jul6lCYnShGbJgq8JJinO8AoTnOM8TPMki2JWUZZX0XKXoQSzlnIRWvKGUu0XXOuBraMkS5LlQtCSCe0e_oR07ABu1r4R0s1CrR3jy2GvUYJdbz2bMdwI9xcDeyfpBqV3l5fihs5fJm7gew2Sm3QEuLr1t2883SwGJdaX2WfPTTOUPt9Y61epBpGtQ2dfgh7-y5r8JwAA__9QZSGn">