[Bug c++/99245] New: internal compiler error: in write_cluster, at cp/module.cc:14600

[Bug c++/99245] New: internal compiler error: in write_cluster, at cp/module.cc:14600

[alexander.lelyakin at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99245

            Bug ID: 99245
           Summary: internal compiler error: in write_cluster, at
                    cp/module.cc:14600
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: alexander.lelyakin at googlemail dot com
  Target Milestone: ---

g++ -std=c++20 -fmodules-ts -x c++-system-header typeinfo
g++ -std=c++20 -fmodules-ts -x c++-system-header vector
g++ -std=c++20 -fmodules-ts -x c++-system-header future
----
/usr/local/include/c++/11.0.0/future: internal compiler error: in
write_cluster, at cp/module.cc:14600
0x6e2d56 module_state::write_cluster(elf_out*, depset**, unsigned int,
depset::hash&, unsigned int*, unsigned int*)
        ../../gcc/gcc/cp/module.cc:14600
0xa62be8 module_state::write(elf_out*, cpp_reader*)
        ../../gcc/gcc/cp/module.cc:17734
0xa638fc finish_module_processing(cpp_reader*)
        ../../gcc/gcc/cp/module.cc:19860
0x9f72cb c_parse_final_cleanups()
        ../../gcc/gcc/cp/decl2.c:5175
----
g++ (GCC) 11.0.0 20210223 (experimental)

[Bug c++/99245] [modules] ICE in write_cluster, at cp/module.cc:14600

[alexander.lelyakin at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99245

--- Comment #1 from Alexander Lelyakin <alexander.lelyakin at googlemail dot com> ---
There is a shorter sequence:

g++ -std=c++20 -fmodules-ts -x c++-system-header typeinfo
g++ -std=c++20 -fmodules-ts -x c++-system-header ostream
----
/usr/local/include/c++/11.0.1/ostream: internal compiler error: in
write_cluster, at cp/module.cc:14605
0x6e2d18 module_state::write_cluster(elf_out*, depset**, unsigned int,
depset::hash&, unsigned int*, unsigned int*)
        ../../gcc/gcc/cp/module.cc:14605
0xa634de module_state::write(elf_out*, cpp_reader*)
        ../../gcc/gcc/cp/module.cc:17785
0xa640cf finish_module_processing(cpp_reader*)
        ../../gcc/gcc/cp/module.cc:19922
0x9f776b c_parse_final_cleanups()
        ../../gcc/gcc/cp/decl2.c:5175
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
----
g++ (GCC) 11.0.1 20210228 (experimental)

[Bug c++/99245] [modules] ICE in write_cluster, at cp/module.cc:14600

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99245

Nathan Sidwell <nathan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-03-05
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #2 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
// bug_a.ii
namespace std { class type_info {}; }

// bug_b.ii
namespace std { class type_info; }

import "bug_a.ii";

namespace std {
  const type_info* __cxa_exception_type () noexcept;
}

evvm1702:160>./cc1plus -quiet -fmodule-header bug_a.ii && ./cc1plus -quiet
-fmodule-header bug_b.ii 
bug_b.ii: internal compiler error: in write_cluster, at cp/module.cc:14506
0xcdfd72 module_state::write_cluster(elf_out*, depset**, unsigned int,
depset::hash&, unsigned int*, unsigned int*)
        ../../../src/gcc/cp/module.cc:14506
0xce9486 module_state::write(elf_out*, cpp_reader*)
        ../../../src/gcc/cp/module.cc:17763
0xcef73a finish_module_processing(cpp_reader*)
        ../../../src/gcc/cp/module.cc:19870

[Bug c++/99245] [modules] ICE in write_cluster, at cp/module.cc:14600

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99245

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Nathan Sidwell <nathan@gcc.gnu.org>:

https://gcc.gnu.org/g:9e64dd6b3f6706de571c6ed3c4b7a8c8b67f22b7

commit r11-7532-g9e64dd6b3f6706de571c6ed3c4b7a8c8b67f22b7
Author: Nathan Sidwell <nathan@acm.org>
Date:   Fri Mar 5 12:49:34 2021 -0800

    c++: Duplicate namespace bindings [PR 99245]

    Header units can declare the same entity, and this can lead to one of
    them containing a (non-using) binding to an import.  If one gets the
    cluster ordering just right, an assert will trigger.  Relax that assert.

            PR c++/99245
            gcc/cp/
            * module.cc (module_state::write_cluster): Relax binding assert.
            gcc/testsuite/
            * g++.dg/modules/pr99245_a.H: New.
            * g++.dg/modules/pr99245_b.H: New.

[Bug c++/99245] [modules] ICE in write_cluster, at cp/module.cc:14600

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99245

Nathan Sidwell <nathan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
9e64dd6b3f6 2021-03-05 | c++: Duplicate namespace bindings [PR 99245]

[Bug c++/99245] [modules] ICE in write_cluster, at cp/module.cc:14600

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99245

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 99222 has been marked as a duplicate of this bug. ***