[Bug c/101437] New: [12 Regression] ICE: Segmentation fault signal terminated program cc1

["anbu1024.me at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101437

            Bug ID: 101437
           Summary: [12 Regression] ICE: Segmentation fault signal
                    terminated program cc1
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anbu1024.me at gmail dot com
  Target Milestone: ---

$ cat test.c 

struct s
{
  unsigned int : 1;
};

inline static void foo(int x)
{
  struct s this_struct = {.var = x};
  *((volatile struct s *) 0x880000UL) = this_struct;
}

void bar()
{
  foo(0);
}

--------------------------------

$ gcc-sp12 --version
gcc (GCC) 12.0.0 20210711 (experimental)
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

--------------------------------

$ gcc-sp12 test.c 
test.c: In function ‘foo’:
test.c:9:28: error: ‘struct s’ has no member named ‘var’
    9 |   struct s this_struct = {.var = x};
      |                            ^~~
test.c:9:34: warning: excess elements in struct initializer
    9 |   struct s this_struct = {.var = x};
      |                                  ^
test.c:9:34: note: (near initialization for ‘this_struct’)
gcc: internal compiler error: Segmentation fault signal terminated program cc1
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.

--------------------------------

$ gcc-sp11 --version
gcc (GCC) 11.1.1 20210710
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

--------------------------------

$ gcc-sp11 test.c 
test.c: In function ‘foo’:
test.c:9:28: error: ‘struct s’ has no member named ‘var’
    9 |   struct s this_struct = {.var = x};
      |                            ^~~
test.c:9:34: warning: excess elements in struct initializer
    9 |   struct s this_struct = {.var = x};
      |                                  ^
test.c:9:34: note: (near initialization for ‘this_struct’)