Issue: dev-libs/libphonenumber-8.12.39 adds -Werror flag on its own.
Discovered on: amd64 (internal ref: usr-merge_tinderbox)
(USR-MERGE-SYSTEM) in the summary means that the bug was found on a machine that runs default/linux/amd64/17.1/systemd/merged-usr profile but this bug MAY or MAY NOT BE related to the new profile.
-Werror is not recommended for releases and should always be disabled when encountered in build-logs, because there are numerous cases where this breaks without purpose.
See also: https://devmanual.gentoo.org/ebuild-writing/common-mistakes/index.html.
Created attachment 847604 [details]
build log and emerge --info