[Bug c++/90462] New: Internal compiler error with deprecated-copy and json diagnostics

[schopf.dan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90462

            Bug ID: 90462
           Summary: Internal compiler error with deprecated-copy and json
                    diagnostics
           Product: gcc
           Version: 9.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schopf.dan at gmail dot com
  Target Milestone: ---

Created attachment 46351
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46351&action=edit
source code which crashes

When using the new json diagnostics output there is an internal
compiler error due to a deprecated-copy warning. The original 
issue has been found in the Boost regex library, I have used
creduce to create a minimal test case.

It can be reproduced with GCC 9.1.0 and the attached code using
this command line:

$ g++ -Wdeprecated-copy -fdiagnostics-format=json deprecated-copy-crash.cc

Internal compiler error: Error reporting routines re-entered.
0x7f49dce76e4a __libc_start_main
        ../csu/libc-start.c:308



The regular text output works as expected:

$ g++ -Wdeprecated-copy -fdiagnostics-format=text deprecated-copy-crash.cc
...
deprecated-copy-crash.cc: In instantiation of ‘void h<
<template-parameter-1-1>, <template-parameter-1-2> >::o(const i*, const i*,
unsigned int) [with i = char; <template-parameter-1-2> = int]’:
deprecated-copy-crash.cc:22:5:   required from ‘void b<
<template-parameter-1-1> >::assign() [with i = char]’
deprecated-copy-crash.cc:28:12:   required from ‘s<i, t>& s<i,
<template-parameter-1-2> >::p(const i*, const i*, f::g) [with i = char;
<template-parameter-1-2> = e<char>; f::g = int]’
deprecated-copy-crash.cc:45:77:   required from here
deprecated-copy-crash.cc:43:5: warning: implicitly-declared ‘constexpr G&
G::operator=(const G&)’ is deprecated [-Wdeprecated-copy]
   43 |   a = r();
deprecated-copy-crash.cc:33:3: note: because ‘G’ has user-provided ‘G::G(G&)’
   33 |   G(G &);
      |   ^
...


Problem also seems to be reproducible on trunk: https://godbolt.org/z/5aT3K1