[PATCH] ggc, jit: forcibly clear GTY roots in jit

[Antoni Boucher]

I added it to bugzilla here:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111396

Since this only reproduces part of the issue, please let me test again
with rustc_codegen_gcc after adding the missing fix.

I confirmed that the fix is in
https://github.com/antoyo/gcc/commit/9d5b6b20efa20825926196759d50706a604c64a8
so you might as well include all of this (except the linetable
condition in toplev.cc).

On Tue, 2023-09-12 at 14:38 -0400, David Malcolm wrote:
> On Tue, 2023-09-12 at 13:36 -0400, Antoni Boucher wrote:
> > In the mean time, here's a (Rust) reproducer for the issue:
> > 
> > fn main() {
> >     for _ in 0..5 {
> >         let context = Context::default();
> >         context.add_command_line_option("-flto");
> >        
> > context.set_optimization_level(OptimizationLevel::Aggressive);
> >         context.add_driver_option("-nostdlib");
> > 
> >         let int_type = context.new_type::<i32>();
> > 
> >         let function = context.new_function(None,
> > FunctionType::Exported, int_type, &[], "main", false);
> >         let block = function.new_block("start");
> >         let value = context.new_rvalue_from_int(int_type, 42);
> >         block.end_with_return(None, value);
> > 
> >         context.compile_to_file(OutputKind::Executable, "my_exe");
> >     }
> > }
> 
> Can we get this in bugzilla please?  If you generate a .c version of
> the context (via gcc_jit_context_dump_reproducer_to_file) I can try
> to
> debug it.
> 
> Thanks
> Dave
>