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[130.44.159.43]) by smtp.gmail.com with ESMTPSA id j9-20020ac874c9000000b003dffd3d3df5sm6584063qtr.2.2023.03.22.08.05.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 Mar 2023 08:05:42 -0700 (PDT) Message-ID: <27792154-4cac-437d-6160-f88403567ec5@redhat.com> Date: Wed, 22 Mar 2023 11:05:41 -0400 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.9.0 Subject: Re: [PATCH] wwwdocs: Clarify experimental status of C++17 prior to GCC 9 To: Jonathan Wakely , gcc-patches@gcc.gnu.org Cc: Marek Polacek References: <20230322104230.343644-1-jwakely@redhat.com> From: Jason Merrill In-Reply-To: <20230322104230.343644-1-jwakely@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-12.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,KAM_NUMSUBJECT,KAM_SHORT,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 3/22/23 06:42, Jonathan Wakely wrote: > We don't currently have a single page where you can find out when > support for a given standard became non-experimental (you have to look > through all the gcc-X/changes.html pages to find it). I think we should > have that info on the cxx-status.html page. This adds it for C++17, and > we can do the same for C++20 when we declare that stable. > > OK for wwwdocs? OK. > -- >8 -- > > Also link to library docs for C++20 and add a cxx2a anchor which is used > by some old links. > --- > htdocs/projects/cxx-status.html | 20 ++++++++++++-------- > 1 file changed, 12 insertions(+), 8 deletions(-) > > diff --git a/htdocs/projects/cxx-status.html b/htdocs/projects/cxx-status.html > index b5362bba..7f59e5a2 100644 > --- a/htdocs/projects/cxx-status.html > +++ b/htdocs/projects/cxx-status.html > @@ -402,10 +402,12 @@ > --> > > > -

C++20 Support in GCC

> +

C++20 Support in GCC

> >

GCC has experimental support for the latest revision of the C++ > - standard, which was published in 2020.

> + standard, which was published in 2020. > + The status of C++20 library features is described in > + the library documentation.

> >

C++20 features are available since GCC 8. To enable C++20 > support, add the command-line parameter -std=c++20 > @@ -988,14 +990,16 @@ > >

GCC has almost full support for the previous revision of the C++ > standard, which was published in 2017. > - Some library features are missing or incomplete, as described in > + The status of C++17 library features is described in > the library documentation. >

> > -

C++17 features are available since GCC 5. This mode is the default > - in GCC 11; it can be explicitly selected with the -std=c++17 > - command-line flag, or -std=gnu++17 to enable GNU extensions > - as well.

> +

C++17 mode is the default since GCC 11; it can be explicitly selected > + with the -std=c++17 command-line flag, or > + -std=gnu++17 to enable GNU extensions as well. > + Some C++17 features are available since GCC 5, but support was experimental > + and the ABI of C++17 features was not stable until GCC 9. > +

> >

C++17 Language Features

> > @@ -1315,7 +1319,7 @@ > >

GCC has full support for the of the 2014 C++ standard.

> > -

This mode is the default in GCC 6.1 up until GCC 10 (including); it can > +

This mode is the default in GCC 6.1 up until GCC 10 (inclusive); it can > be explicitly selected with the -std=c++14 command-line flag, > or -std=gnu++14 to enable GNU extensions as well.

>