[Bug target/47558] 163267 breaks exception traceback in xplor-nih

["howarth at nitro dot med.uc.edu" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558

--- Comment #6 from Jack Howarth <howarth at nitro dot med.uc.edu> 2011-02-01 03:55:13 UTC ---
We should be very concerned about the fact that on the darwin10 builds of gcc
trunk, we don't prefix the same symbols in the FSF gcc's libgcc_s.1.dylib with
$ld$hide$os10.4$, $ld$hide$os10.5$ and $ld$hide$os10.6$ as the system
libgcc_s.1.dylib . It is entirely uncertain how the darwin linker behaves when
only shown...

    /sw/lib/gcc4.6/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current
version 1.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version
125.2.10)

as a linkage since /sw/lib/gcc4.6/lib/libgcc_s.1.dylib contains the same
symbols as in
/usr/lib/libgcc_s.1.dylib but without these magic prefixes. It is an open
question if the stub
mechanism is properly engaged in this case. I am trying to getting a
clarification from the Apple linker developer on how serious this problem is.