Hello In order to prevent the XY problem, here is my goal: Rebuild the entire system with -Os optimization level. It is an experiment into viability of hardware-targeted optimizations.
The [2.1 Packaging Tutorial][1] of the Cookbook mentions that it is possible to pass a #:make-flags argument to a list of packages. Unfortunately, no explanation is given how to implement this functionality, and which exactly lists of packages does it apply to. Does the Guix System have a facility similar to Gentoo's [make.conf][2], where a default optimization set can be declared? A potential problem is with packages that are dependencies of services, like %desktop-services. I hope those also would inherit the changes. [1]: https://guix.gnu.org/cookbook/en/html_node/Packaging-Tutorial.html [2]: https://wiki.gentoo.org/wiki//etc/portage/make.conf#CFLAGS_and_CXXFLAGS
