[Bug c++/67557] Calling copy constructor of base class in constructor of derived class produces crashing code

["Georg.Baum at post dot rwth-aachen.de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67557

--- Comment #6 from Georg Baum <Georg.Baum at post dot rwth-aachen.de> ---
(In reply to Markus Trippelsdorf from comment #4)
> Well, the automatically generated copy constructor is a (special) member
> function.

OK, I see what you mean, but I still do not understand. The automatically
generated default constructor is a special member function as well. Yet calling
it (implicitly by the compiler or explicitly by the programmer in the
initializer list) from a constructor of a derived class is legal. Also,
explicitly calling user defined constructors like in

FontTag::FontTag() : StartTag("") {}

is legal as well (at least this is my understanding and I have seen this many
times in existing code). What is special about a copy constructor that makes
§12.6.2 - 14 apply to it but not to other constructors?
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Subject: [Bug c/67563] New: verify_flow_info failed
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67563

            Bug ID: 67563
           Summary: verify_flow_info failed
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 36330
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36330&action=edit
C source code

For trunk gcc dated 20150912

$ ../results/bin/gcc -c -O2 -fexceptions bug228.c
emit_lua.c: In function ‘emit_package.isra.20’:
emit_lua.c:1140:1: error: BB 167 can not throw but has an EH edge
emit_lua.c:1140:1: error: BB 180 can not throw but has an EH edge
emit_lua.c:1140:1: error: BB 192 can not throw but has an EH edge
emit_lua.c:1140:1: error: BB 204 can not throw but has an EH edge
emit_lua.c:1140:1: internal compiler error: verify_flow_info failed
0x722373 verify_flow_info()
        ../../src/trunk/gcc/cfghooks.c:262
0xa7c019 execute_function_todo
        ../../src/trunk/gcc/passes.c:1963
0xa7d557 do_per_function
        ../../src/trunk/gcc/passes.c:1642
0xa7d557 execute_todo
        ../../src/trunk/gcc/passes.c:2008
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/67563] verify_flow_info failed
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg563

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-09-13
                 CC|                            |trippels at gcc dot gnu.org
     Ever confirmed|0                           |1
      Known to fail|                            |5.2.1, 6.0

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
static void emit_package (int p1)
{
  int a;
  int b[0];
  a = __fprintf_chk (0, 0, "");
}
void emit_lua () { emit_package (0); }