[Bug ld/17447] .eh_frame_hdr table[5707] FDE at 0000000000c45b8c overlaps table[5708] FDE at 0000000000c45a88

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17447

--- Comment #3 from Alan Modra <amodra at gmail dot com> ---
I installed Ubuntu 14.10 and had a look myself.  We have a bunch of
FDEs for a zero length address range..

0003b830 0000000000000014 0003b834 FDE cie=00000000
pc=00000000003481a0..00000000003481a0
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop

0003b848 0000000000000014 0003b84c FDE cie=00000000
pc=00000000003481a0..00000000003481a0
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop

[snipped quite a few more], then this one matching the same starting
address but with non-zero range.

0003b968 0000000000000014 0003b96c FDE cie=00000000
pc=00000000003481a0..00000000003481a3
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop

The zero-length FDEs seem to all be coming from CGStmtOpenMP.o in
/usr/lib/llvm-3.5/lib/libclangCodeGen.a.  This object file also defines a bunch
of zero length function symbols..

These FDEs could indeed cause an unwinder problem.

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