On 2016.09.30 at 23:31 +0200, Marek Polacek wrote:
> This PR reports a bogus -Wimplicit-fallthrough warning on the attached test.
> The problem is that last_stmt_in_scope should for GIMPLE_TRY, if the last
> statement of the eval part can't fallthrough, return this statement and don't
> warn. And the same should be true for FALLTHROUGH (). This patch fixes it.
>
> Bootstrapped/regtested on x86_64-linux, ok for trunk?
Try to compile the testcase without the fallthrough attribute...
> diff --git gcc/testsuite/g++.dg/warn/Wimplicit-fallthrough-1.C
> gcc/testsuite/g++.dg/warn/Wimplicit-fallthrough-1.C
> index e69de29..8f80b01 100644
> --- gcc/testsuite/g++.dg/warn/Wimplicit-fallthrough-1.C
> +++ gcc/testsuite/g++.dg/warn/Wimplicit-fallthrough-1.C
> @@ -0,0 +1,16 @@
> +// PR c++/77803
> +// { dg-do compile { target c++11 } }
> +// { dg-options "-Wimplicit-fallthrough" }
> +
> +struct A {};
> +int a;
> +void fn1() {
> + switch (0) {
> + case 0: {
> + A b;
> + [[fallthrough]];
> + }
> + default:
> + a = 0;
> + }
> +}
>
> Marek
>
--
Markus
