[Bug tree-optimization/128094] __builtin_dynamic_object_size returns 0 for container_of through a char *

[lightofmysoul at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128094

--- Comment #1 from lightofmysoul at gmail dot com ---
Created attachment 65928
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65928&action=edit
testcase for _FORTIFY_SOURCE=2