cdt, crash with --gc:arc, works fine with default gc #12978
Description
Here is the fully condensed code as requested:
Example
type
Vector2* = object of RootObj
x*, y*: float
type
Vertex* = ref object
point*: Vector2
proc newVertex*(p: Vector2): Vertex =
return Vertex(point: p)
proc createVertex*(p: Vector2): Vertex =
result = newVertex(p)
proc p =
var x = Vector2(x: 1, y: 2)
discard createVertex(x)
echo "OK"
p()
Current Output
$ nim c -r t.nim
Hint: used config file '/home/stefan/Nim/config/nim.cfg' [Conf]
Hint: used config file '/home/stefan/Nim/config/config.nims' [Conf]
Hint: operation successful (7695 lines compiled; 0.018 sec total; 11.562MiB peakmem; Debug Build) [SuccessX]
Hint: /tmp/hhh/t [Exec]
OK
stefan@nuc /tmp/hhh $ nim c --gc:arc -r t.nim
Hint: used config file '/home/stefan/Nim/config/nim.cfg' [Conf]
Hint: used config file '/home/stefan/Nim/config/config.nims' [Conf]
Hint: system [Processing]
Hint: widestrs [Processing]
Hint: io [Processing]
Hint: t [Processing]
/home/stefan/Nim/lib/system/excpt.nim(464, 23) Hint: passing 'currException' to a sink parameter introduces an implicit copy; use 'move(currException)' to prevent it [Performance]
CC: stdlib_io.nim
CC: stdlib_system.nim
CC: t.nim
Hint: [Link]
Hint: operation successful (19548 lines compiled; 0.340 sec total; 24.516MiB peakmem; Debug Build) [SuccessX]
Hint: /tmp/hhh/t [Exec]
Traceback (most recent call last)
/tmp/hhh/t.nim(20) t
/tmp/hhh/t.nim(17) p
/tmp/hhh/t.nim(13) createVertex
/tmp/hhh/t.nim(10) newVertex
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
Error: execution of an external program failed: '/tmp/hhh/t '
Expected Output
Consistency at least
Possible Solution
- fix it
Additional Information
$ nim -v
Nim Compiler Version 1.1.1 [Linux: amd64]
Compiled at 2019-12-25
Copyright (c) 2006-2019 by Andreas Rumpf
git hash: 649bf326bfc6b4eb983403d850b1dcfc0cc854ae
active boot switches: -d:release