[Bug c++/98735] New: ICE with -std=c++20 -fmodules-ts -fsanitize=undefined

[Bug c++/98735] New: ICE with -std=c++20 -fmodules-ts -fsanitize=undefined

[webrown.cpp at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98735

            Bug ID: 98735
           Summary: ICE with -std=c++20 -fmodules-ts -fsanitize=undefined
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: webrown.cpp at gmail dot com
  Target Milestone: ---

Using gcc version 11.0.0 20210116 (experimental) (Homebrew GCC HEAD-2c356f2_2)
and compiling with flags:
   -std=c++20 -fmodules-ts -fsanitize=undefined
produces:
  internal compiler error: in tree_node, at cp/module.cc:9125
pointing at the module keyword (line 1) in the following innocuous program:

  export module X;

  export
    inline constexpr bool f( ) noexcept
    { return true; }

Removing -fsanitize=undefined permits successful compilation.

[Bug c++/98735] ICE with -std=c++20 -fmodules-ts -fsanitize=undefined

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98735

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marxin at gcc dot gnu.org,
                   |                            |nathan at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-01-18
     Ever confirmed|0                           |1

[Bug c++/98735] ICE with -std=c++20 -fmodules-ts -fsanitize=undefined

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98735

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2021-01-18 00:00:00         |2022-7-26

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
mod.C:1:8: internal compiler error: in tree_node, at cp/module.cc:9192
    1 | export module X;
      |        ^~~~~~
0x6e1d98 trees_out::tree_node(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:9192
0xa93753 trees_out::core_vals(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:6028
0xa96e14 trees_out::tree_node_vals(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:7176
0xa96e14 trees_out::tree_value(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:9014
0xa92c41 trees_out::tree_node(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:9212
0xa93753 trees_out::core_vals(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:6028
0xa96e14 trees_out::tree_node_vals(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:7176
0xa96e14 trees_out::tree_value(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:9014
0xa92c41 trees_out::tree_node(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:9212
0xa93889 trees_out::core_vals(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:6219
0xa96e14 trees_out::tree_node_vals(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:7176
0xa96e14 trees_out::tree_value(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:9014
0xa92c41 trees_out::tree_node(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:9212
0xa96f52 trees_out::write_function_def(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:11472
0xa991d4 depset::hash::find_dependencies(module_state*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:13250
0xa99670 module_state::write_begin(elf_out*, cpp_reader*, module_state_config&,
unsigned int&)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:17816
0xa9aa94 finish_module_processing(cpp_reader*)
        /home/jwakely/src/gcc/gcc/gcc/cp/module.cc:20150
0xa2849f c_parse_final_cleanups()
        /home/jwakely/src/gcc/gcc/gcc/cp/decl2.cc:5156
0xc4dbd0 c_common_parse_file()
        /home/jwakely/src/gcc/gcc/gcc/c-family/c-opts.cc:1253
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

[Bug c++/98735] ICE with -std=c++20 -fmodules-ts -fsanitize=undefined

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98735

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gscfq@t-online.de

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 107924 has been marked as a duplicate of this bug. ***

[Bug c++/98735] ICE with -std=c++20 -fmodules-ts -fsanitize=undefined

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98735

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ppalka at gcc dot gnu.org
   Last reconfirmed|2022-07-26 00:00:00         |2024-3-7

--- Comment #3 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Reconfirmed on trunk