This is an auto-filed bug because sci-mathematics/coq does not respect CFLAGS. The issue was originally discovered on amd64, but it may be reproducible on other arches as well. If you think that a different summary clarifies the issue better, feel free to change it. Attached build log and emerge --info. NOTE: To reproduce this issue you may want to set CFLAGS="${CFLAGS} -frecord-gcc-switches". If this is not something about c/c++ context you may want to set also FFLAGS and FCFLAGS or just see this bug as an hint to hide the QA warning where is not possible to respect CFLAGS.
Created attachment 641960 [details] build.log.bz2 build log and emerge --info
https://gitweb.gentoo.org/repo/gentoo.git/commit/eclass/findlib.eclass?id=bf7791b79da4b59159c43c653b37e08bb2eff6bf