[Bug build/14121] make writes .mo files in po directory

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https://sourceware.org/bugzilla/show_bug.cgi?id=14121

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f2da2fd81f1d3f43678de9cf39b12692c6fa449b

commit f2da2fd81f1d3f43678de9cf39b12692c6fa449b
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri Dec 15 14:27:20 2017 +0000

    Do not build .mo files in source directory (bug 14121).

    Building and installing glibc leaves .mo files (compiled message
    translations) behind in the source directory.  Building those files in
    the source directory may once have made sense, if they were included
    in release tarballs; now that release tarballs are just the output of
    "git archive", building any non-checked-in files in the source
    directory does not make sense.  This patch changes these files to be
    built in the build directory instead.  The realclean rule is changed
    to simply adding the .mo files to the "generated" variable, since once
    the files are in the build directory it make no sense to exclude them
    from normal cleanup rules.

    This is necessary but not sufficient to avoid build-many-glibcs.py
    needing to copy the glibc source directory.  Its list of files to
    touch on checkout to avoid subsequent regeneration (configure,
    preconfigure, *-kw.h) is incomplete (missing at least INSTALL,
    sysdeps/gnu/errlist.c, posix/testcases.h, posix/ptestcases.h,
    locale/C-translit.h, (only regenerated for Hurd builds)
    sysdeps/mach/hurd/bits/errno.h, (only regenerated for 32-bit SPARC
    builds) sysdeps/sparc/sparc32/{sdiv,udiv,rem,urem}.S) - the existing
    list may be sufficient to prevent regeneration that actually changes
    the file contents depending on the installed build tools, but not to
    ensure there is no regeneration at all - and there might well be other
    things writing into the source directory in the course of building and
    testing (so needing appropriate testing with read-only source
    directories with different timestamp orderings to find and eliminate
    all such cases).

    Tested for x86_64.

        [BZ #14121]
        * po/Makefile (generated): Add $(ALL_LINGUAS:%=%.mo).
        (%.mo): Change to $(objpfx)%.mo.  Use $(make-target-directory).
        ($(mo-installed)): Use $(objpfx)%.mo.
        (realclean): Remove rule.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog   |    6 ++++++
 po/Makefile |   10 +++++-----
 2 files changed, 11 insertions(+), 5 deletions(-)

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