This patch allows us to use glibc's build system to build locales
in a package separate from glibc.

  1. Use 'localedef' from $PATH since we are not rebuilding it.
  2. Use '--no-archive' to avoid building the big locale archive, and
     because the already-built 'localedef' would want to write it
     to '/run/current-system/locale', which is not possible.
  3. Pass $(inst_complocaledir)/$$locale to install files in the right
     place, and because otherwise, 'localedef' fails with:
     "cannot write output files to `(null)'".

diff -ru glibc-2.29-old/localedata/Makefile glibc-2.29-new/localedata/Makefile
--- glibc-2.29-old/localedata/Makefile	2019-01-31 11:45:36.000000000 -0500
+++ glibc-2.29-new/localedata/Makefile	2019-07-03 22:48:35.662015071 -0400
@@ -385,7 +385,7 @@
 
 # Sometimes the whole collection of locale files should be installed.
 LOCALEDEF=I18NPATH=. GCONV_PATH=$(common-objpfx)iconvdata LC_ALL=C \
-$(rtld-prefix) $(common-objpfx)locale/localedef
+  localedef --no-archive
 install-locales: install-locale-archive
 
 # Create and install the locale-archive file.
@@ -414,7 +414,7 @@
 	input=`echo $$locale | sed 's/\([^.]*\)[^@]*\(.*\)/\1\2/'`; \
 	$(LOCALEDEF) $$flags --alias-file=../intl/locale.alias \
 		     -i locales/$$input -f charmaps/$$charset \
-		     $(addprefix --prefix=,$(install_root)) $$locale \
+		     $(addprefix --prefix=,$(install_root)) $(inst_complocaledir)/$$locale \
 	&& echo ' done';
 endef
 
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<tr><td><span title='2021-05-18 22:23:48 +0200'>2021-05-18</span></td><td><a href='/guix/commit/gnu/packages/code.scm?id=6ee590eca8d67c21d678fb808bce9dc91542db14'>gnu: universal-ctags: Update to 5.9.20210509.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/code.scm (universal-ctags): Update to 5.9.20210509.0.
[source](snippet): Adjust unbundling substitution.
[arguments]: Add #:test-target.  Patch more files before bootstrapping.
Remove trailing #t's.
[native-inputs]: Use PACKCC instead of an ad-hoc fork.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-05-02 23:52:12 +0200'>2021-05-02</span></td><td><a href='/guix/commit/gnu/packages/code.scm?id=bf5374f493772c126a2deba07b9213dd30b65055'>gnu: global: Update to 6.6.6.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/code.scm (global): Update to 6.6.6.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-05-02 23:49:08 +0200'>2021-05-02</span></td><td><a href='/guix/commit/gnu/packages/code.scm?id=aa74d37b6f4d95461e1b5e43dd560f4cb82a36c3'>gnu: cloc: Update to 1.90.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/code.scm (cloc): Update to 1.90.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-04-28 14:41:31 +0300'>2021-04-28</span></td><td><a href='/guix/commit/gnu/packages/code.scm?id=f7ff88621310d2902f147b1120210f7e117c461a'>gnu: global: Fix cross compiling.</a><span class='msg-avail'>...<span class='msg-tooltip'>Coreutils was removed during patch review erroneously.
Reported by Maxime Devos &lt;maximedevos@telenet.be&gt;.

* gnu/packages/code.scm (global)[inputs]: Add coreutils.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-04-28 12:25:09 +0300'>2021-04-28</span></td><td><a href='/guix/commit/gnu/packages/code.scm?id=93242b54e4eff90432df9de4841297f19b358e55'>gnu: global: Fix globash.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/code.scm (global)[arguments]: Add 'fix-globash phase.

Signed-off-by: Efraim Flashner &lt;efraim@flashner.co.il&gt;
</span></span></td><td>luhui</td></tr>
<tr><td><span title='2021-04-05 12:03:09 +0200'>2021-04-05</span></td><td><a href='/guix/commit/gnu/packages/code.scm?id=dda0ada3849719f183ee158871d382b2f57f7a59'>gnu: sloccount: Update source URL.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/code.scm (sloccount)[source, home-page]: Update.
</span></span></td><td>Ludovic Courtès</td></tr>