I can't see an obvious way to run the regression tests via meson with the --no-locale setting. This is particularly important on Windows. The buildfarm client first runs the regression tests with this setting and then tests (via installcheck) against instances set up with its configured locales. We do it this way so we are not subject to the vagaries of whatever environment we are running in.
cheers
andrew
--
Andrew Dunstan
EDB: https://www.enterprisedb.com