[Bug default/27578] --odr mode fails for a Libreoffice shared library

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27578

--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
OK, that's due to:
...
idx: 48
cu: 0xbc
incoming: 200
incoming: 201
incoming: 201
incoming: 203
incoming: 204
incoming: 208
...

There are two incoming edges from the same CU.  So, one CU is importing the
same PU twice.  We can see this in the output if we do --no-import-optimize:
...
 <1><4742f>: Abbrev Number: 51 (DW_TAG_imported_unit)
    <47430>   DW_AT_import      : <0x7f02>      [Abbrev Number: 18
(DW_TAG_partial_unit)]
 <1><47434>: Abbrev Number: 51 (DW_TAG_imported_unit)
    <47435>   DW_AT_import      : <0x7f02>      [Abbrev Number: 18
(DW_TAG_partial_unit)]
...

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