We use -fdebug-prefix-map= because debugedit doesn't work for us (for a currently unknown reason since it's the most obtuse code I've ever had the pleasure of reading). With all the unique macros enabled, the destination directory we pass to -fdebug-prefix-map= includes the package release. The release is either the timestamp of the current commit or the current time if the working tree is dirty. This means it generally changes every time we rerun the build script. However, meson only reads compiler arguments the first time it is invoked or if --wipe is specified. This means that on a rerun -fdebug-prefix-map= will be configured wrong and the build will fail. Let's prevent this from happening by disabling the unique debug source names by overriding the --unique-debug-src-base option that is passed to find-debuginfo.sh by rpm via the _find_debuginfo_opts macro.
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