[Bug c++/107192] New: [modules] internal compiler error: Segmentation fault parsing line "module :Bar;"

[Bug c++/107192] New: [modules] internal compiler error: Segmentation fault parsing line "module :Bar;"

[tortoise_74 at yahoo dot co.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107192

            Bug ID: 107192
           Summary: [modules] internal compiler error: Segmentation fault
                    parsing line "module :Bar;"
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tortoise_74 at yahoo dot co.uk
  Target Milestone: ---

Created attachment 53682
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53682&action=edit
Sample code to reproduce segfault

Found while trying to create a reproducer for
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107191

When attempting to compile the following code:

```
module;
module :Bar;
```

I got:

```
[ 25%] Building CXX object CMakeFiles/gccice.dir/Bar.cpp.o
/usr/bin/c++   -fmodules-ts -std=gnu++20 -MD -MT
CMakeFiles/gccice.dir/Bar.cpp.o -MF CMakeFiles/gccice.dir/Bar.cpp.o.d -o
CMakeFiles/gccice.dir/Bar.cpp.o -c /home/brucea/projects/jobs/gccice2/Bar.cpp
/home/brucea/projects/jobs/gccice2/Bar.cpp:8:9: internal compiler error:
Segmentation fault
    8 | module :Bar;
      |         ^~~
0x7f02a38e151f ???
        ./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0x7f02a38c8d8f __libc_start_call_main
        ../sysdeps/nptl/libc_start_call_main.h:58
0x7f02a38c8e3f __libc_start_main_impl
        ../csu/libc-start.c:392
Please submit a full bug report,
with preprocessed source if appropriate.
```

This may or may not be legal code but a segfault is incorrect.

>gcc --version
gcc (Ubuntu 11.2.0-19ubuntu1) 11.2.0

[Bug c++/107192] [modules] internal compiler error: Segmentation fault parsing line "module :Bar;"

[tortoise_74 at yahoo dot co.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107192

--- Comment #1 from Bruce Adams <tortoise_74 at yahoo dot co.uk> ---
Still occurs if I use gcc 12.1

>g++-12 --version
g++-12 (Ubuntu 12.1.0-2ubuntu1~22.04) 12.1.0

```
[ 50%] Building CXX object CMakeFiles/gccice.dir/Bar.cpp.o
/usr/bin/g++-12   -fmodules-ts -std=gnu++20 -MD -MT
CMakeFiles/gccice.dir/Bar.cpp.o -MF CMakeFiles/gccice.dir/Bar.cpp.o.d -o
CMakeFiles/gccice.dir/Bar.cpp.o -c /home/brucea/projects/jobs/gccice2/Bar.cpp
/home/brucea/projects/jobs/gccice2/Bar.cpp:8:9: internal compiler error:
Segmentation fault
    8 | module :Bar;
      |         ^~~
0xd910e3 crash_signal
        ../../src/gcc/toplev.cc:322
0x7f5f531b851f ???
        ./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0x783313 module_state::is_partition() const
        ../../src/gcc/cp/module.cc:3482
0x783313 get_module(tree_node*, module_state*, bool)
        ../../src/gcc/cp/module.cc:13782
0x7b3a91 cp_parser_module_name
        ../../src/gcc/cp/parser.cc:14522
0x7da1e2 cp_parser_module_declaration
        ../../src/gcc/cp/parser.cc:14595
0x7fa3d3 cp_parser_translation_unit
        ../../src/gcc/cp/parser.cc:4968
0x7fa3d3 c_parse_file()
        ../../src/gcc/cp/parser.cc:48068
0x8e6335 c_common_parse_file()
        ../../src/gcc/c-family/c-opts.cc:1240
```

[Bug c++/107192] [modules] internal compiler error: Segmentation fault parsing line "module :Bar;"

[nshead at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107192

Nathaniel Shead <nshead at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|ice-on-valid-code           |ice-on-invalid-code
           Assignee|unassigned at gcc dot gnu.org      |nshead at gcc dot gnu.org
                 CC|                            |nshead at gcc dot gnu.org
             Status|UNCONFIRMED                 |RESOLVED
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=110808
   Target Milestone|---                         |14.0
         Resolution|---                         |FIXED

--- Comment #2 from Nathaniel Shead <nshead at gcc dot gnu.org> ---
Fixed on trunk with r14-6977-g7f24446a3cf67d.