[Bug compile/31581] New: Expr crashes on assignments to register pointer

[Bug compile/31581] New: Expr crashes on assignments to register pointer

[tsqurt at outlook dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31581

            Bug ID: 31581
           Summary: Expr crashes on assignments to register pointer
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: compile
          Assignee: unassigned at sourceware dot org
          Reporter: tsqurt at outlook dot com
  Target Milestone: ---

void use(void *) {}

int main () {
  int a[] = {3, 4};
  register int *b;

  b = a; // <- break here
  use(b);
  return 0;
}

GDB crashes running `expr b = a`. If b is not declared as "register",
everything goes well.

gcc a.c -g && gdb ./a.out 
Reading symbols from ./a.out...
(gdb) b 7
Breakpoint 1 at 0x401116: file a.c, line 7.
(gdb) run
Starting program: a.out 

Breakpoint 1, main () at a.c:7
7         b = a; // <- break here and compile this expression
(gdb) expr b = a

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ffb04a in _gdb_expr (__regs=0x7ffff7fc7000) at gdb command line:1
warning: 1      gdb command line: No such file or directory
The program being debugged was signaled while in a function called from GDB.
GDB remains in the frame where the signal was received.
To change this behavior use "set unwindonsignal on".
Evaluation of the expression containing the function
(_gdb_expr) will be abandoned.
When the function is done executing, GDB will silently stop.
(gdb) 

Affected versions: GNU gdb (GDB) 13.2, 14.2, 15.0.50.20240331-git

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