New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/34422#issuecomment-989262159

Comment:
I've found the musl test failure. Our `glib` is misconfigured due to a lack of `CFLAGS` (upstream's fault, I'm not sure how it went undetected before).

It should be using the `USE_XLOCALE` code path in `gstrfuncs.c`, but it isn't, so it's using the `g_ascii_formatd` implementation, which has a mistaken `  g_return_val_if_fail (format[0] == '%', NULL);` for some reason. It fails, because the format being passed is `" %f"` (note the space).

I'm not sure why the test exists, but trying to fix glib first.