From: Jeff Law <jeffreyalaw@gmail.com>
To: Qing Zhao <qing.zhao@oracle.com>
Cc: "gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Subject: Re: Should -ffp-contract=off the default on GCC?
Date: Tue, 21 Mar 2023 13:51:20 -0600 [thread overview]
Message-ID: <8df774e4-0711-23ba-786e-4c9ccfb3d450@gmail.com> (raw)
In-Reply-To: <9787B47E-9800-47B1-B98D-60430257C4E5@oracle.com>
On 3/21/23 13:01, Qing Zhao wrote:
>
> The code previously worked now has some issue since we added some new stuff into standard, and the compiler added some new transformation based on this new stuff. Should the compiler issue some warnings to warn the users about such change? Then the user will go to the new standard to get more info?
It is not at all uncommon to have old code no longer work due to a
compiler update.
This can happen if the compiler changes the default version of the
language it's supporting (say c99 to c11) or fixes a missed-error bug
(more common in C++) or the optimizers just get smarter and code which
was always buggy, but worked by accident no longer works.
When we can reasonably give diagnostics, we try to. Improvements in
this space are appreciated :-)
Jeff
next prev parent reply other threads:[~2023-03-21 19:51 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-16 16:24 Qing Zhao
2023-03-16 16:31 ` Andrew Pinski
2023-03-16 16:38 ` Qing Zhao
2023-03-16 16:53 ` Jakub Jelinek
2023-03-16 18:40 ` Qing Zhao
2023-03-20 22:05 ` Qing Zhao
2023-03-20 22:25 ` Jakub Jelinek
2023-03-21 12:49 ` Qing Zhao
2023-03-21 15:01 ` Qing Zhao
2023-03-21 16:56 ` Paul Koning
2023-03-21 17:00 ` Qing Zhao
2023-03-21 17:59 ` Jeff Law
2023-03-21 18:03 ` Paul Koning
2023-03-21 18:55 ` Toon Moene
2023-03-21 18:12 ` Alexander Monakov
2023-03-21 18:18 ` Jeff Law
2023-03-22 10:13 ` Richard Biener
2023-03-22 12:26 ` Alexander Monakov
2023-03-22 13:57 ` Richard Biener
2023-03-22 15:52 ` Qing Zhao
2023-03-24 7:12 ` Fangrui Song
2023-03-24 19:42 ` Andrew Pinski
2023-03-31 16:31 ` Qing Zhao
2023-03-21 19:01 ` Qing Zhao
2023-03-21 19:12 ` Jakub Jelinek
2023-03-21 23:28 ` Jeff Law
2023-03-21 23:31 ` Jakub Jelinek
2023-03-21 19:51 ` Jeff Law [this message]
2023-03-21 21:08 ` Qing Zhao
2023-03-22 12:33 ` Alexander Monakov
2023-03-22 14:33 ` Qing Zhao
2023-03-27 9:03 Zeson
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