[Bug regression/64812] [4.9 regression] x86 LibreOffice Build failure: undefined reference to acquire

["timo.teras at iki dot fi" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64812

Timo Teräs <timo.teras at iki dot fi> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |timo.teras at iki dot fi

--- Comment #3 from Timo Teräs <timo.teras at iki dot fi> ---
I can reproduce this, but unfortunately I don't have minimalistic test case
yet.

As a workaround removing -fvisibility-inlines-hidden from the build flags,
makes things work in the libreoffice.

What is involved / happening is:

The non-virtual thunks are in a DSO, but marked hidden. This is caused by
-fvisibility-inlines-hidden. The ::acquire members are virtual, but with inline
implementation (no inline marking / attribute though). The class itself is
marked __attribute__((visibility("default"))).

It appears that the places getting these unresolved symbols are trying to call
external symbol, even though it's inline implementation.

Apparently optimization flags, code context affects when this happens.

The symptoms sounds very much similar to what was in llvm:
http://llvm.org/bugs/show_bug.cgi?id=12255
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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/64932] [4.9/5.0 Regression] ICE in gfc_conv_descriptor_data_get for generated finalizer
Date: Wed, 04 Feb 2015 09:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd932

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.9.3
            Summary|[5.0] ICE on module end,    |[4.9/5.0 Regression] ICE in
                   |gfc_conv_descriptor_data_ge |gfc_conv_descriptor_data_ge
                   |t                           |t for generated finalizer

--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> ---
The problem seems to occur in the finalizer, i.e. __final_coo_graphs_Coo_graph
for the component ref (ptr2 is of type coo_graph):

  ptr2->edges

which is an array_type - but with fixed bounds; it fails in
gfc_conv_descriptor_data_get for line

157       gcc_assert (GFC_DESCRIPTOR_TYPE_P (type));