There is an updated pull request by sgn against master on the void-packages repository

https://github.com/sgn/void-packages common-prefix-map
https://github.com/void-linux/void-packages/pull/40120

environment: set -ffile-prefix-map
We're setting -fdebug-prefix-map to strip directory prefixes from debug info, which will help ccache and reproducibility.

However, -fdebug-prefix-map doesn't help with those macros like __FILE__ and __BASE_FILE__, which needs another flags: -fmacro-prefix-map.

Replaces -fdebug-prefix-map with -ffile-prefix-map which is an alias for both `-fdebug-prefix-map` and `-fmacro-prefix-map`. (This flag is available since GCC 8 and Clang 10)

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A patch file from https://github.com/void-linux/void-packages/pull/40120.patch is attached