[Bug c/112559] The -fno-builtin option affects the instruction generation of the program

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112559

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>Does the gcc behavior change when processing -fno-builtin?

Yes because we gcc understands the behavior of free, malloc, realloc, etc.
In your case since you are implementing those functions -fno-builtin is
required.