On Thu, 23 Feb 2023 at 14:00, Saifi Khan <saifi.khan@xxxxxxxxx> wrote:
>
> Hi:
>
> was working through p2680r1 example with the code as follows.
>
> ---
> auto f (int i) -> int {
> return i + 100;
> }
>
> int g (int j) [[pre: f (j) < j ]] {
> int r { j - f (j)};
> return 2 * r;
> }
>
> auto test () -> void {
> g (5);
> }
>
> ---
>
> Environment
> - Linux 6.1.0-3-amd64 x86_64 GNU/Linux
> - Debian GLIBC 2.36-8) 2.36
> - gcc version 13.0.1 20230215 (experimental) (GCC)
>
> What is not clear to me is the following.
>
> This works.
>
> :: g++ -std=c++23 -fcontracts contract_01.cc
> :: ./a.out
> contract violation in function g at contract_01.cc:8: f (j) < j
> terminate called without an active exception
> Aborted
> ::
>
> But this doesn't work !
>
> :: g++ -std=c++23 -O3 -g2 -fcontracts contract_01.cc
> during RTL pass: final
> contract_01.cc: In function ‘int g(int)’:
> contract_01.cc:13:1: internal compiler error: in gen_inlined_subroutine_die, at dwarf2out.cc:25002
But this is just a compiler bug, why are you trying to infer anything
about recommended optimization levels from a bug?
All this means is GCC has a bug, it doesn't mean you should or
shouldn't use optimization with contracts. Please report the bug.
