Say you want to test the effect of a libc patch on LibreOffice:

guix build libreoffice --with-patch=glibc=./my-glibc-tweak.patch

Granted, this example would contribute a fair deal to global warming, but the point is that this new option makes it easy to test patches:

@civodul some of us have a residential PV installation. We can compile and compile and compile and compile with no harm done.

Global warming could be reduced by inserting libc as a graft instead of rebuilding all dependencies.

@kirschwipfel Definitely! We could have an additional ‘--with-grafted-patch’ option. In fact, several transformation options could have two variants, direct and graft.

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