This is an auto-filed bug because mail-mta/courier calls ar directly. 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: If you think it doesn't make sense fix these type of issues, I'd like to point out that won't be possible use a different AR implementation (like llvm-ar) by setting the AR variable. So this issue has been reproduced by setting the AR variable to x86_64-pc-linux-gnu-ar and by removing the /usr/bin/ar binary.
Created attachment 641140 [details] build.log build log and emerge --info
ci has reproduced this issue with version 1.1.8 - Updating summary.
ci has reproduced this issue with version 1.1.8-r1 - Updating summary.
ci has reproduced this issue with version 1.1.8-r2 - Updating summary.
ci has reproduced this issue with version 1.2.2 - Updating summary.
ci has reproduced this issue with version 1.2.2-r1 - Updating summary.
ci has reproduced this issue with version 1.2.3 - Updating summary.
ci has reproduced this issue with version 1.2.3-r1 - Updating summary.
ci has reproduced this issue with version 1.3.3 - Updating summary.
ci has reproduced this issue with version 1.3.5 - Updating summary.
ci has reproduced this issue with version 1.3.7 - Updating summary.
ci has reproduced this issue with version 1.3.8 - Updating summary.
ci has reproduced this issue with version 1.3.8-r1 - Updating summary.
ci has reproduced this issue with version 1.3.9 - Updating summary.
ci has reproduced this issue with version 1.3.10 - Updating summary.
ci has reproduced this issue with version 1.3.12 - Updating summary.