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doc: reflect the publication of C++20 in invoke.texi and standards.texi

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Jonathan mentioned on IRC that ISO/IEC 14882:2020 has been published
yesterday (and indeed it appears on www.iso.org for sale).
I think we should reflect that in our documentation and in cxx-status.html,
patches attached.
I understand we want to keep C++20 support experimental even in GCC 11,
though not sure if we should still talk about "almost certainly change in
incompatible ways" rather than that it might change in incompatible ways.

2021-01-05  Jakub Jelinek  <jakub@redhat.com>

	* doc/invoke.texi (-std=c++20): Adjust for the publication of
	ISO 14882:2020 standard.
	* doc/standards.texi: Likewise.
This commit is contained in:
Jakub Jelinek 2021-01-05 22:42:05 +01:00
parent c5e94699ef
commit db7ce388dc
2 changed files with 20 additions and 10 deletions
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14
gcc/doc/invoke.texi
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@ -2419,15 +2419,17 @@ The name @samp{gnu++1z} is deprecated.
@item c++20
@itemx c++2a
The next revision of the ISO C++ standard, planned for
2020. Support is highly experimental, and will almost certainly
change in incompatible ways in future releases.
The 2020 ISO C++ standard plus amendments.
Support is experimental, and could change in incompatible ways in
future releases.
The name @samp{c++2a} is deprecated.
@item gnu++20
@itemx gnu++2a
GNU dialect of @option{-std=c++20}. Support is highly experimental,
and will almost certainly change in incompatible ways in future
releases.
GNU dialect of @option{-std=c++20}.
Support is experimental, and could change in incompatible ways in
future releases.
The name @samp{gnu++2a} is deprecated.
@end table
@item -fgnu89-inline

16
gcc/doc/standards.texi
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@ -192,7 +192,7 @@ information concerning the history of C that is available online, see
@section C++ Language
GCC supports the original ISO C++ standard published in 1998,
and the 2011 and 2014 revisions.
and the 2011, 2014, 2017 and mostly 2020 revisions.
The original ISO C++ standard was published as the ISO standard (ISO/IEC
14882:1998) and amended by a Technical Corrigenda published in 2003
@ -221,11 +221,18 @@ To select this standard in GCC, use the option @option{-std=c++14}.
The C++ language was further revised in 2017 and ISO/IEC 14882:2017 was
published. This is referred to as C++17, and before publication was
often referred to as C++1z. GCC supports all the changes in the new
often referred to as C++1z. GCC supports all the changes in that
specification. For further details see
@uref{https://gcc.gnu.org/projects/@/cxx-status.html#cxx1z}. Use the option
@uref{https://gcc.gnu.org/projects/@/cxx-status.html#cxx17}. Use the option
@option{-std=c++17} to select this variant of C++.
Another revised ISO C++ standard was published in 2020 as ISO/IEC
14882:2020, and is referred to as C++20; before its publication it was
sometimes referred to as C++2a. GCC supports most of the changes in the
new specification. For further details see
@uref{https://gcc.gnu.org/projects/@/cxx-status.html#cxx20}.
To select this standard in GCC, use the option @option{-std=c++20}.
More information about the C++ standards is available on the ISO C++
committee's web site at @uref{http://www.open-std.org/@/jtc1/@/sc22/@/wg21/}.
@ -243,7 +250,8 @@ select an extended version of the C++ language explicitly with
@option{-std=gnu++98} (for C++98 with GNU extensions), or
@option{-std=gnu++11} (for C++11 with GNU extensions), or
@option{-std=gnu++14} (for C++14 with GNU extensions), or
@option{-std=gnu++17} (for C++17 with GNU extensions).
@option{-std=gnu++17} (for C++17 with GNU extensions), or
@option{-std=gnu++20} (for C++20 with GNU extensions).
The default, if
no C++ language dialect options are given, is @option{-std=gnu++17}.