<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/147445>147445</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [ELF format][GDB][debug_section][Does LLVM customize the 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/eJy0WF1zo7jS_jXyTZcpIcCYC1-QeDybejOz785sdi-nBAijE4E4kojj_fWnJITxRyY7s3VOKhe2Plr9tJ6nu2WqNd93jG1QcoeS7YIOppFq88qp_Den3X55oN1-UcjquAH4hQkhEblHOH9AJG2BdoBIjkied5WSvFp-lYMq2fJeVmycANpV05ovn5Yf__9puf3y8MeHL28sHTRTAcL5nw3r4AGMOoKRdhQqVtNBGChl23PBwEgplmVD-XR-Kayv4TrAQeitIbLuFSsGLoxGZOdWILJrpDaI7ATvhtfl63o1TS1VQsg6TBHZIZKNIE_HNewHMSByD4BwPu94w7OSdvDzpsHaRji3AYU965iiZtz_4XHnbbRUcF1-GzG6TbU9RA9lybSuByGONsAI53eDcfbcKtMwxYBraAdtQMuWmYZ3e9hLpuGgpA2cR2evHhyCz7_-7u5mRrCvCn-qkVCxYtjDu3GYQFQOgfXUO-cJMPSVhVgr2X7fiJGXc9k89_MMiFaEJIjsCt7NGywZHJBeyUKwFrThQgB75dp4h11UNO9Kppg4woF2Bo5yUC5Qz7yrxBEaJnpoGdBCDgYKJuTBe_7bwLThsvsW3mjmNEXG7_N5COfL5RJhG3V40SBEVZzGEM7DIIRbISFCTncFN2xBhFhitvb86Qot-AcDupEH7zRTSipomdZ0P97YCvt_PCWCb2GCSAz2FAgQ2Z0fhXMAgLvdFkX5hQ9RDkNHC6dv4B03nAr-l1W_VYtiWoM21AwaaqlAs9JGBgLn5jchS8G10db8ldFOGuAdsFdWDsbZr6VqqZtz-hi_unWKlXLf8b9YdQXMhZTA3WDOSH2rN3vhBfPsL44gqGHa-OX2jpYkDHCAT-yV4v0Q2j3XIQSXpHa__h9wAwepnvWts85fiOD3ZpSoHExvecc7qo4j7B_FMDs_J7liMKcscLv2lAlGvmYIZzTwc1MEHTCuXdQp9PLAVD0IFxHPucm-NrIH2UF7BFpVrIJCMfrcS95ZXV8eU0zHfJXOCmhj89ckSi-DH8xZt6H58Li7EOLypDeEc8VoxUQ9qvGlXfrvF8tIEAaQdxUcfI7z3jx1xdCZAZFU-8On3f5ORllaTNycLtPp8UBVZ7P1uSLdpj8vJyalaKNg6PTQ91LZ5HsSlzn2zGrCpwiP67vMnOAuewise6wzb2h9ghHl4P2xHyfxIpLOXiGSQkP13znn3PpqlIVWDW0Psr6w531BJEVR7rINSu5sygGMki3Ax_t7awiR9ZOP-e7RqkJCHKRBtAwHNxwiko0j5zYIvbLx8fPTuHB9tjAq3SofL7ssDLNVmsZ4LLp3_V76T4UUvhLfCTMNtmKcL6hmlaX-qTnJwFUleGFKW8C-FmLnS2NMry1olx7oeHqwl3IvmHb9hA0OIjsrMtc-2Tpoqdor-S9WGqjWGEc0TlZVGNOoYsUaJ3FZUZqQrK6LGpMqK8iK2Kp4FpU6cngfeffMlA3M4-N2du02M5GABOBy6WEuUYPFOmaGl_a2xbuQ1CkP8SltW74A7Y6THN7PqhcC_RsG_wTVLoj2T3h2wbLvksyvGll2TjKS4nAVrv8xyXz_c0OybCLZ2d9_hW9FRJMIs3KVRGkYr1YJZjEp2DqrQ7zOWEajZL2OV3jk2wXbrsiWvU22vJAv7L2MOuVSS7yrTGqDM7dit_xzzPPbz5inpzbZNtHPtvO46oLfbH9d5ndlubFnqNHI2Jm7trxgc2d-Vib8HXmbUvlh3-GMo0-fl5-oKRs4cNNcFz5ni732rDTUEjtwx1IDgtFqbq_nQmnLskVeSqVYacRxbpreq50jQOfWXDzdY-m3EEX51r41TGMfIYx2Gh4f__gE5aCNbCfDrvimGnzBGHXoX0X_E4-jnXOPWJL9Ig_OzgPU_BW4sZOWHC19vu0l7MK5mXjvgYai3RiMRbWJqizK6IJtwjQJsxjHeL1oNkVdkYoVGS6rIqqqsA5XabSKcRyzdLVe4QXfEEwSnOI1JngVrwNakzAjqyqlaRFl9QrFmLWUi8BSOJBqv-BaD2wTxmkcJwtBCya0-wGAkI4dwM3al0KyXaiN430x7DWKseuwZzOGG-F-OXDvt5FxyRYldx-3d-OHy6tyQ-6if_h2k-1iUGJzmWn23DRD4XOL9eYqrSCycxjsq8-DfNmQ_wQAAP__4XIaWQ">