glibc: clean up install, add C.UTF-8 by default

[ahesford]

We should really provide the C.UTF-8 locale by default. I believe that the best way to do so is by removing it entirely from /etc/default/libc-locales processing and install it, as part of the main glibc package, in /usr/lib/locales like Arch does.

This currently trips the package linter, so either

• We can make an exception for glibc in the linter, or
• Rather than include the locale files in the package, we can add an INSTALL script to the base package to write the C.utf-8 locale outside of an archive, where it will always be reachable.

I favor the first because it is less wasteful; why should everybody have to generate a locale that we expect everybody to have available by default?

A third option is to modify the glibc-locales INSTALL script to either add a separate, non-archived C.utf-8 locale directory, or just ensure that C.UTF-8 is always included in the locale processing. Both seem even more kludgey than doing the right thing by default.

Thoughts? @void-linux/pkg-committers

While I was at it, I cleaned up the install function a bit.

[ahesford]

For bikeshedding, I added the proposed linter exception.

[oreo639]

Afaict, the outputs generated by localedef are endian-specific although you can specify --big-endian or --little-endian.

You can see how Debian handles it here:
https://salsa.debian.org/glibc-team/glibc/-/blob/6c8b05d8a7138593c80908d5fe5b928d2ac038d6/debian/rules.d/build.mk#L340-358

[ahesford]

Changes adopted. For native builds, we can just use the make target; for cross builds, we will fall back to the host utility with proper endianness.

[oreo639]

Thinking about it more, using the system localedef command is a bit problematic when cross-compiling from musl.
Maybe it would be good to use the qemu build helper instead?
(for that either we can define LOCALEDEF manually like Debian (where qemu gets added when cross compiling), just call localedef manually with vtargetrun, or use vsed -i localedata/Makefile -e "s|\$(rtld-prefix)|qemu-${XBPS_TARGET_QEMU_MACHINE}-static \$(rtld-prefix)|")

[ahesford]

We don't generally support cross-compiling across C libraries, and I'm not sure about the wisdom of requiring qemu-user-static in a bootstrap package like glibc.

[oreo639]

Yeah.