[Bug libobjc/49883] clang + gcc 4.6 runtime = broken

[nicola at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49883

--- Comment #2 from Nicola Pero <nicola at gcc dot gnu.org> 2011-10-09 10:29:54 UTC ---
Author: nicola
Date: Sun Oct  9 10:29:50 2011
New Revision: 179721

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=179721
Log:
In libobjc/:
2011-10-09  Nicola Pero  <nicola.pero@meta-innovation.com>

    PR libobjc/49883
    * init.c (__objc_exec_class): Work around a bug in clang's code
    generation.  Clang sets the class->info field to values different
    from 0x1 or 0x2 (the only allowed values in the traditional GNU
    Objective-C runtime ABI) to store some additional information, but
    this breaks backwards compatibility.  Wipe out all the bits in the
    fields other than the first two upon loading a class.

2011-10-09  Nicola Pero  <nicola.pero@meta-innovation.com>

    * class.c (objc_lookup_class): Added back for compatibility with
    clang which seems to emit calls to it.

Modified:
    trunk/libobjc/ChangeLog
    trunk/libobjc/class.c
    trunk/libobjc/init.c