[Bug default/27661] New: The XML reader gives anonymous types non-empty linkage_name

["gprocida+abigail at google dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27661

            Bug ID: 27661
           Summary: The XML reader gives anonymous types non-empty
                    linkage_name
           Product: libabigail
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: gprocida+abigail at google dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

The title of the bug is just a statement of fact. Debugging shows that the
anonymous structs etc. get linkage names like "__anonymous_struct__".

With post-processed XML (so, not necessarily trustworthy), I've managed to
trigger an assertion related to this:

Line numbers are offset due some debugging statements.

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff798a537 in __GI_abort () at abort.c:79
#2  0x00007ffff798a40f in __assert_fail_base (fmt=0x7ffff7af3128 "%s%s%s:%u:
%s%sAssertion `%s' failed.\n%n", assertion=0x555555763465 "__abg_cond__",
file=0x555555763451 "../../src/abg-ir.cc", line=12554, function=<optimized
out>)
    at assert.c:92
#3  0x00007ffff7999662 in __GI___assert_fail
(assertion=assertion@entry=0x555555763465 "__abg_cond__",
file=file@entry=0x555555763451 "../../src/abg-ir.cc", line=line@entry=12554, 
    function=function@entry=0x555555763050 "static abigail::ir::type_base_sptr
abigail::ir::type_base::get_canonical_type_for(abigail::ir::type_base_sptr)")
at assert.c:101
#4  0x00005555555e9c88 in abigail::ir::type_base::get_canonical_type_for
(t=std::shared_ptr<class abigail::ir::type_base> (use count 11, weak count 1) =
{...}) at ../../src/abg-ir.cc:12554
#5  0x00005555555f0d98 in abigail::ir::canonicalize (t=std::shared_ptr<class
abigail::ir::type_base> (use count 11, weak count 1) = {...}) at
/usr/include/c++/10/bits/shared_ptr_base.h:736
#6  0x00005555556eb980 in
abigail::xml_reader::read_context::perform_late_type_canonicalizing
(this=0x5555558308e0) at /usr/include/c++/10/ext/atomicity.h:100
#7  0x00005555556d53e7 in abigail::xml_reader::read_corpus_from_input
(ctxt=...) at ../../src/abg-reader.cc:1977
#8  0x000055555559956f in main (argc=<optimized out>, argv=0x7fffffffd738) at
/usr/include/c++/10/bits/shared_ptr_base.h:1324

The assertion is:

  ABG_ASSERT(!class_or_union
             || !class_or_union->get_is_anonymous()
             || class_or_union->get_linkage_name().empty());

I'll see if I can reproduce this with a minimum of XML transformation.

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