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doc: Remove outdated -fdebug-prefix-map section in dev notes

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The section claims to be for ccache builds, however those are already
fixed after commit 1cc58d3a0c653ac30df04d1010a3cf84c6bc307a.

If there are still any build or debug problems after that commit,
dedicated instructions can be added back, along with exact steps to
reproduce and test.

Github-Pull: #34413
Rebased-From: fa06cd4ba7303bd3036467cf00d12f36c94bcaff
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MarcoFalke 2026-01-26 10:55:31 +01:00 committed by fanquake
parent c294b66126
commit eda6c979bd
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doc/developer-notes.md
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@ -305,37 +305,6 @@ If you need to build exclusively for debugging, set the `-DCMAKE_BUILD_TYPE`
to `Debug` (i.e. `-DCMAKE_BUILD_TYPE=Debug`). You can always check the cmake
build options of an existing build with `ccmake build`.
### Show sources in debugging
If you have ccache enabled, absolute paths are stripped from debug information
with the `-fdebug-prefix-map` and `-fmacro-prefix-map` options (if supported by the
compiler). This might break source file detection in case you move binaries
after compilation, debug from the directory other than the project root or use
an IDE that only supports absolute paths for debugging (e.g. it won't stop at breakpoints).
There are a few possible fixes:
1. Configure source file mapping.
For `gdb` create or append to [`.gdbinit` file](https://sourceware.org/gdb/current/onlinedocs/gdb#gdbinit-man):
```
set substitute-path ./src /path/to/project/root/src
```
For `lldb` create or append to [`.lldbinit` file](https://lldb.llvm.org/man/lldb.html#configuration-files):
```
settings set target.source-map ./src /path/to/project/root/src
```
2. Add a symlink to the `./src` directory:
```
ln -s /path/to/project/root/src src
```
3. Use `debugedit` to modify debug information in the binary.
4. If your IDE has an option for this, change your breakpoints to use the file name only.
### debug.log
If the code is behaving strangely, take a look in the `debug.log` file in the data directory;