[Bug locale/28199] New: iconvconfig prefix flag behaves differently in glibc 2.34

["patrick.mccarty at intel dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28199

            Bug ID: 28199
           Summary: iconvconfig prefix flag behaves differently in glibc
                    2.34
           Product: glibc
           Version: 2.34
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: locale
          Assignee: unassigned at sourceware dot org
          Reporter: patrick.mccarty at intel dot com
  Target Milestone: ---

Overview:
---------

In glibc 2.34, I observed that the gconv-modules cache created by `iconvconfig
--prefix=PATHPREFIX` contains a module lookup path with a prepended value of
PATHPREFIX. That is, the lookup path is "PATHPREFIX/LIBDIR/gconv-modules/".

However, in glibc 2.33 and earlier, the module lookup path from the cache
created by the same command does *not* contain that prepended value. Instead
the path is "LIBDIR/gconv-modules/".

I don't know if this is an expected change or a bug, but the distro I
contribute to (Clear Linux OS) relies on the behavior from glibc <= 2.33, since
the distro package re-creates the gconv module cache (with `iconvconfig
--prefix=%{buildroot}`) after the `make install`, running as a non-root user.
Thus, the expectation has been for the cache file to be pre-populated and not
created via %post scripts or equivalent mechanisms.


Steps to Reproduce:
-------------------

I tested on Clear Linux OS, comparing the results on release 34900 (with glibc
2.33) to 34930 (with glibc 2.34). But any equivalent setup to compare
`iconvconfig` behavior from glibc 2.33 to 2.34 will work.

1. Run the following series of commands (or equivalent). They assume the glibc
under test is installed system-wide and that the installation libdir is
/usr/lib64.

  $ mkdir -p /tmp/usr/lib64
  $ cp -a /usr/lib64/gconv /tmp/usr/lib64/
  $ rm -f /tmp/usr/lib64/gconv/gconv-modules.cache
  $ iconvconfig --prefix=/tmp -o foo
  $ strings foo | grep /usr/lib64/gconv


Actual Results:
---------------

The grep command prints `/tmp/usr/lib64/gconv/`, demonstrating that the path
prefix, `/tmp`, is prepended to the cache lookup path. 


Expected Results:
-----------------

The grep command prints `/usr/lib64/gconv/`, demonstrating that the path prefix
is omitted from the lookup path. This is the behavior in glibc <= 2.33.

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