[Bug target/28854] New: unwinder reports sentinel frame.

["pluto at agmk dot net" <gcc-bugzilla at gcc dot gnu dot org>]

on alpha-linux target the unwinder reports sentinel frame.
imho it has no sense.

$ gcc testcase.c -O2; ./a.out
ip = 0x120000768
ip = 0x20000076860
ip = 0x120000668
ip = (nil)
a.out: testcase.c:10: helper: Assertion `ip != 0' failed.

$ cat testcase.c
#include <dlfcn.h>
#include <unwind.h>
#include <assert.h>
#include <stdio.h>
_Unwind_Reason_Code helper( struct _Unwind_Context* ctx, void* arg )
{
        _Unwind_Ptr ip = _Unwind_GetIP( ctx );
        printf( "ip = %p\n", (void*)ip );
        assert( ip != 0 );
        return _URC_NO_REASON;
}
int main()
{
        _Unwind_Backtrace( helper, 0 );
        return 0;
}


-- 
           Summary: unwinder reports sentinel frame.
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pluto at agmk dot net
GCC target triplet: alpha-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28854