[PATCH] (RFA tree-tailcall) PR c++/82081 - tail call optimization breaks noexcept
Fri Apr 26 15:18:00 GMT 2019
On Fri, Apr 12, 2019 at 05:24:26PM -0400, Jason Merrill wrote:
> If a noexcept function calls a function that might throw, doing the tail
> call optimization means that an exception thrown in the called function
> will propagate out, breaking the noexcept specification. So we need to
> prevent the optimization in that case.
> Tested x86_64-pc-linux-gnu. OK for trunk or hold for GCC 10? This isn't a
> regression, but it is a straightforward fix for a wrong-code bug.
> * tree-tailcall.c (find_tail_calls): Don't turn a call from a
> nothrow function to a might-throw function into a tail call.
Ok for trunk (i.e. GCC 10) and we can backport later to 9.2 if it works fine
on the trunk.
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