[Bug c/94075] When using linker-generated list, bad optimization performed in -O2

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94075

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

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

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC think incrementing start will never get to end.
So you need to hide that from GCC.
The best way is doing:
({ static const int foo[0] __attribute__((aligned(4), section(".foo_1")));
const int *a = &foo[0]; __asm__("":"+r"(a)); a});

libgcc does that in crtstuff.c:
  fn = _ITM_deregisterTMCloneTable;
  __asm ("" : "+r" (fn));