We got this problem on a recent build:
https://github.com/dfxml-working-group/dfxml_cpp/actions/runs/7567459660

It's not our problem; it's a bug a push to libgcc that somebody pushed.

• https://community.cisco.com/t5/tools/error-size-of-array-altstackmem-is-not-an-integral-constant/td-p/4555761
• Build of testthat fails r-lib/testthat#1373
• https://stackoverflow.com/questions/71454588/minsigstksz-error-after-update-in-my-manjaro-linux
• https://bugs.gentoo.org/803962