On Mon, Mar 09, 2026 at 10:44:21AM +0100, Filip Kastl wrote:
> * toplev.cc (toplev::main): Ask for 128MB stack instead of 64MB
> stack when __SANITIZE_ADDRESS__ is defined.
>
> Signed-off-by: Filip Kastl <[email protected]>
> ---
> gcc/toplev.cc | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/gcc/toplev.cc b/gcc/toplev.cc
> index 682459220a2..b41189cab0a 100644
> --- a/gcc/toplev.cc
> +++ b/gcc/toplev.cc
> @@ -2301,7 +2301,11 @@ toplev::main (int argc, char **argv)
> {
> /* Parsing and gimplification sometimes need quite large stack.
> Increase stack size limits if possible. */
> +#ifdef __SANITIZE_ADDRESS__
> stack_limit_increase (64 * 1024 * 1024);
> +#else
> + stack_limit_increase (128 * 1024 * 1024);
> +#endif
In my reading this uses 64MB for ASAN instrumented gcc and 128MB otherwise,
not 128MB for ASAN and 64MB otherwise.
Also, what is the stack growth factor e.g. on that problematic testcase?
Is it 2x, or say 1.5x or 1.25x? Perhaps we don't need 128MB but 96MB etc.,
doesn't have to be a power of two...
Jakub
