[Bug libc/796] New: tst-cancel* test fail with VDSO enable kernel.

["sjmunroe at us dot ibm dot com" <sourceware-bugzilla at sources dot redhat dot com>]

When the kernel introduces VDSO which contains the signal trampolines but glibc
itself has not eanbled VDSO, the unwinder in libgcc.so does not handle it
correctly (current gcc-3.3 and gcc3.4). In this call the tst-cancel* cases from
make check fail.

However when glibc is enabled for VDSO (and the VDSO is in the link-maps)
libgcc.so unwind can use the CFI info to unwind correctly. and the cancel test pass.

Since VDSO is ignored when the kernel does not return AT_SYSINFO_EHDR, and we
plan to eable VDSO any way, it seems like a good time to enable VDSO for powerpc.

-- 
           Summary: tst-cancel* test fail with VDSO enable kernel.
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: gotom at debian dot or dot jp
        ReportedBy: sjmunroe at us dot ibm dot com
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: powerpc64--linux
  GCC host triplet: powerpc64--linux
GCC target triplet: powerpc64--linux


http://sources.redhat.com/bugzilla/show_bug.cgi?id=796

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