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libcpp: Adjust __STDC_VERSION__ for C23

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While the C23 standard isn't officially release yet,
in 2011 we've changed __STDC_VERSION__ value for C11 already
in the month in which the new __STDC_VERSION__ value has been
finalized, so we want to change this now or wait
until we implement all the C23 features?

Note, seems Clang up to 17 also used 202000L for -std=c2x but
Clang 18+ uses 202311L as specified in the latest C23 drafts.

2024-04-30  Jakub Jelinek  <jakub@redhat.com>

	* init.cc (cpp_init_builtins): Change __STDC_VERSION__
	for C23 from 202000L to 202311L.

	* doc/cpp.texi (__STDC_VERSION__): Document 202311L value
	for -std=c23/-std=gnu23.
This commit is contained in:
Jakub Jelinek 2024-04-30 08:58:39 +02:00
parent bd35a92f8d
commit a2452a6891
2 changed files with 3 additions and 3 deletions
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4
gcc/doc/cpp.texi
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@ -1886,8 +1886,8 @@ the 1999 revision of the C standard; the value @code{201112L}
signifies the 2011 revision of the C standard; the value
@code{201710L} signifies the 2017 revision of the C standard (which is
otherwise identical to the 2011 version apart from correction of
defects). An unspecified value larger than @code{201710L} is used for
the experimental @option{-std=c23} and @option{-std=gnu23} modes.
defects). The value @code{202311L} is used for the experimental
@option{-std=c23} and @option{-std=gnu23} modes.
This macro is not defined if the @option{-traditional-cpp} option is
used, nor when compiling C++ or Objective-C@.

2
libcpp/init.cc
View File

@ -594,7 +594,7 @@ cpp_init_builtins (cpp_reader *pfile, int hosted)
_cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
else if (CPP_OPTION (pfile, lang) == CLK_STDC23
|| CPP_OPTION (pfile, lang) == CLK_GNUC23)
_cpp_define_builtin (pfile, "__STDC_VERSION__ 202000L");
_cpp_define_builtin (pfile, "__STDC_VERSION__ 202311L");
else if (CPP_OPTION (pfile, lang) == CLK_STDC17
|| CPP_OPTION (pfile, lang) == CLK_GNUC17)
_cpp_define_builtin (pfile, "__STDC_VERSION__ 201710L");