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[Bug target/24842] New: testsuite failure: gcc.dg/attr-weakref-1.c execution test

This new test fails for mmix-knuth-mmixware, still with
"Sun Nov 13 12:09:09 UTC 2005 (revision 106861M)".

The message in gcc.log is:
PASS: gcc.dg/attr-weakref-1.c (test for excess errors)
*** EXIT code 4242^M
FAIL: gcc.dg/attr-weakref-1.c execution test

I'm not sure whether this is a failure of the testsuite (needing
new requirement "weakref", not "weak"), or the target, because in the
build log I see (for some reason, maybe this is a separate bug):
checking assembler for .weak... yes
checking assembler for .weakref... no
but IIRC the gcc weakref should work without assembler support, so I
label this as a target bug pending further investigation.
(For MMIX, intermediate object files are ELF, but the linked output
is the "mmo" format.)  It's possible the real bug is in the linker
for this target.

NB: for those who try to repeat this problem, there's a testsuite bug that
gets in the way, PR 24841.  You just need to do the full test, with
"make check-gcc RUNTESTFLAGS=--target_board=mmixware-sim" or compile

           Summary: testsuite failure: gcc.dg/attr-weakref-1.c execution
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hp at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: mmix-knuth-mmixware

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