[Bug c/31128] __builtin_stack_restore/__builtin_stack_save should not be exposed to the user

[pinskia at gcc dot gnu dot org]

------- Comment #7 from pinskia at gcc dot gnu dot org  2007-05-28 19:08 -------
(In reply to comment #6)
> This is very useful for compilers generating C code (e.g. LLVM, and various
> other source -> C compilers).  Why remove it?  These compilers are generating
> partially structured code, that don't have syntactic blocks required for VLAs.

Because there are better ways of implementing that in the generated C code. 
You can create a fake VLA (that is of size 0).
Like:
int f(int t1)
{
  {
     int t = 0;
     int a[t];
     int *b = __builtin_alloca(t1);
  }
}


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31128