[Bug build/14664] New: changing prefix breaks "make check-abi-libc"

[Bug build/14664] New: changing prefix breaks "make check-abi-libc"

[jrnieder at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14664

             Bug #: 14664
           Summary: changing prefix breaks "make check-abi-libc"
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jrnieder@gmail.com
                CC: carlos@systemhalted.org
    Classification: Unclassified


sysdeps/unix/sysv/linux/x86_64/64/nptl/libc.abilist contains the line

 _nl_default_dirname D 0x12

That 0x12 is sizeof("/usr/share/locale"), including terminating NUL.
Building with

  ../configure --prefix=/some/other/place
  make

produces an _nl_default_dirname with different size, making the ABI
check fail:

 diff -p -U 0 ../sysdeps/unix/sysv/linux/x86_64/64/nptl/libc.abilist
[...]/build/libc.symlist
 --- ../sysdeps/unix/sysv/linux/x86_64/64/nptl/libc.abilist      2012-10-03
00:41:39.269593517 -0700
 +++ [...]/build/libc.symlist      2012-10-03 11:59:06.569765238 -0700
 @@ -508 +508 @@ GLIBC_2.2.5
 - _nl_default_dirname D 0x12
 + _nl_default_dirname D 0x21
 make[2]: *** [check-abi-libc] Erreur 1

Is the size of this string really part of the ABI?

Could scripts/abilist.awk be taught to fuzz this out?

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[Bug build/14664] changing prefix breaks "make check-abi-libc"

[schwab@linux-m68k.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=14664

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> 2012-10-03 20:24:14 UTC ---
Since the size is part of the ABI this cannot be relaxed.

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[Bug build/14664] changing prefix breaks "make check-abi-libc"

[jrnieder at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14664

Jonathan Nieder <jrnieder at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |

--- Comment #2 from Jonathan Nieder <jrnieder at gmail dot com> 2012-10-03 20:28:28 UTC ---
Are you saying that changing the prefix is not supported?  configure
should refuse to set the prefix and error out in that case.

Or are you saying that programs will break due to _nl_default_dirname
changing size?  Perhaps _nl_default_dirname should not change based on
the prefix then?

I can't see how unexplained build failures when passing --prefix would
not be a bug, so I'm reopening the report.  I'll be happy to mark the
bug as invalid myself if I have made a mistake.

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[Bug build/14664] changing prefix breaks "make check-abi-libc"

[siddhesh at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14664

Siddhesh Poyarekar <siddhesh at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |siddhesh at redhat dot com

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[Bug build/14664] changing prefix breaks "make check-abi-libc"

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14664

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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