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c++: Add support for -std=c++23

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Derived from the changes that added C++2a support in 2017.
r8-3237-g026a79f70cf33f836ea5275eda72d4870a3041e5

No C++23 features are added here.
Use of -std=c++23 sets __cplusplus to 202100L.

$ g++ -std=c++23 -dM -E -x c++ - < /dev/null | grep cplusplus
 #define __cplusplus 202100L

gcc/
	* doc/cpp.texi (__cplusplus): Document value for -std=c++23
	or -std=gnu++23.
	* doc/invoke.texi: Document -std=c++23 and -std=gnu++23.
	* dwarf2out.c (highest_c_language): Recognise C++20 and C++23.
	(gen_compile_unit_die): Recognise C++23.

gcc/c-family/
	* c-common.h (cxx_dialect): Add cxx23 as a dialect.
	* c.opt: Add options for -std=c++23, std=c++2b, -std=gnu++23
	and -std=gnu++2b
	* c-opts.c (set_std_cxx23): New.
	(c_common_handle_option): Set options when -std=c++23 is enabled.
	(c_common_post_options): Adjust comments.
	(set_std_cxx20): Likewise.

gcc/testsuite/
	* lib/target-supports.exp (check_effective_target_c++2a):
	Check for C++2a or C++23.
	(check_effective_target_c++20_down): New.
	(check_effective_target_c++23_only): New.
	(check_effective_target_c++23): New.
	* g++.dg/cpp23/cplusplus.C: New.

libcpp/
	* include/cpplib.h (c_lang): Add CXX23 and GNUCXX23.
	* init.c (lang_defaults): Add rows for CXX23 and GNUCXX23.
	(cpp_init_builtins): Set __cplusplus to 202100L for C++23.
This commit is contained in:
Paul Fee 2021-01-25 01:18:30 +00:00 committed by Jason Merrill
parent 96253f069e
commit 78739c2df7
10 changed files with 110 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
gcc/c-family/c-common.h
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@ -738,7 +738,9 @@ enum cxx_dialect {
/* C++17 */
cxx17,
/* C++20 */
cxx20
cxx20,
/* C++23 */
cxx23
};
/* The C++ dialect being used. C++98 is the default. */

29
gcc/c-family/c-opts.c
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@ -113,6 +113,7 @@ static void set_std_cxx11 (int);
static void set_std_cxx14 (int);
static void set_std_cxx17 (int);
static void set_std_cxx20 (int);
static void set_std_cxx23 (int);
static void set_std_c89 (int, int);
static void set_std_c99 (int);
static void set_std_c11 (int);
@ -649,6 +650,12 @@ c_common_handle_option (size_t scode, const char *arg, HOST_WIDE_INT value,
set_std_cxx20 (code == OPT_std_c__20 /* ISO */);
break;
case OPT_std_c__23:
case OPT_std_gnu__23:
if (!preprocessing_asm_p)
set_std_cxx23 (code == OPT_std_c__23 /* ISO */);
break;
case OPT_std_c90:
case OPT_std_iso9899_199409:
if (!preprocessing_asm_p)
@ -1019,7 +1026,7 @@ c_common_post_options (const char **pfilename)
warn_narrowing = 1;
/* Unless -f{,no-}ext-numeric-literals has been used explicitly,
for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
for -std=c++{11,14,17,20,23} default to -fno-ext-numeric-literals. */
if (flag_iso && !global_options_set.x_flag_ext_numeric_literals)
cpp_opts->ext_numeric_literals = 0;
}
@ -1763,7 +1770,7 @@ set_std_cxx20 (int iso)
flag_no_gnu_keywords = iso;
flag_no_nonansi_builtin = iso;
flag_iso = iso;
/* C++17 includes the C11 standard library. */
/* C++20 includes the C11 standard library. */
flag_isoc94 = 1;
flag_isoc99 = 1;
flag_isoc11 = 1;
@ -1773,6 +1780,24 @@ set_std_cxx20 (int iso)
lang_hooks.name = "GNU C++20";
}
/* Set the C++ 2023 standard (without GNU extensions if ISO). */
static void
set_std_cxx23 (int iso)
{
cpp_set_lang (parse_in, iso ? CLK_CXX23: CLK_GNUCXX23);
flag_no_gnu_keywords = iso;
flag_no_nonansi_builtin = iso;
flag_iso = iso;
/* C++23 includes the C11 standard library. */
flag_isoc94 = 1;
flag_isoc99 = 1;
flag_isoc11 = 1;
/* C++23 includes coroutines. */
flag_coroutines = true;
cxx_dialect = cxx23;
lang_hooks.name = "GNU C++23";
}
/* Args to -d specify what to dump. Silently ignore
unrecognized options; they may be aimed at toplev.c. */
static void

18
gcc/c-family/c.opt
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@ -2214,6 +2214,14 @@ std=c++20
C++ ObjC++
Conform to the ISO 2020 C++ draft standard (experimental and incomplete support).
std=c++2b
C++ ObjC++ Alias(std=c++23)
Conform to the ISO 2020 C++ draft standard (experimental and incomplete support).
std=c++23
C++ ObjC++ Undocumented
Conform to the ISO 2023 C++ draft standard (experimental and incomplete support).
std=c11
C ObjC
Conform to the ISO 2011 C standard.
@ -2285,13 +2293,21 @@ C++ ObjC++
Conform to the ISO 2017 C++ standard with GNU extensions.
std=gnu++2a
C++ ObjC++ Alias(std=gnu++20)
C++ ObjC++ Alias(std=gnu++20) Undocumented
Conform to the ISO 2020 C++ draft standard with GNU extensions (experimental and incomplete support).
std=gnu++20
C++ ObjC++
Conform to the ISO 2020 C++ draft standard with GNU extensions (experimental and incomplete support).
std=gnu++2b
C++ ObjC++ Alias(std=gnu++23)
Conform to the ISO 2023 C++ draft standard with GNU extensions (experimental and incomplete support).
std=gnu++23
C++ ObjC++ Undocumented
Conform to the ISO 2023 C++ draft standard with GNU extensions (experimental and incomplete support).
std=gnu11
C ObjC
Conform to the ISO 2011 C standard with GNU extensions.

7
gcc/doc/cpp.texi
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@ -1907,9 +1907,10 @@ selected, the value of the macro is
@code{201103L} for the 2011 C++ standard,
@code{201402L} for the 2014 C++ standard,
@code{201703L} for the 2017 C++ standard,
or an unspecified value strictly larger than @code{201703L} for the
experimental languages enabled by @option{-std=c++2a} and
@option{-std=gnu++2a}.
@code{202002L} for the 2020 C++ standard,
or an unspecified value strictly larger than @code{202002L} for the
experimental languages enabled by @option{-std=c++23} and
@option{-std=gnu++23}.
@item __OBJC__
This macro is defined, with value 1, when the Objective-C compiler is in

12
gcc/doc/invoke.texi
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@ -2430,6 +2430,18 @@ 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.
@item c++2b
@itemx c++23
The next revision of the ISO C++ standard, planned for
2023. Support is highly experimental, and will almost certainly
change in incompatible ways in future releases.
@item gnu++2b
@itemx gnu++23
GNU dialect of @option{-std=c++2b}. Support is highly experimental,
and will almost certainly change in incompatible ways in future
releases.
@end table
@item -fgnu89-inline

7
gcc/dwarf2out.c
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@ -24492,6 +24492,10 @@ static char *producer_string;
static const char *
highest_c_language (const char *lang1, const char *lang2)
{
if (strcmp ("GNU C++23", lang1) == 0 || strcmp ("GNU C++23", lang2) == 0)
return "GNU C++23";
if (strcmp ("GNU C++20", lang1) == 0 || strcmp ("GNU C++20", lang2) == 0)
return "GNU C++20";
if (strcmp ("GNU C++17", lang1) == 0 || strcmp ("GNU C++17", lang2) == 0)
return "GNU C++17";
if (strcmp ("GNU C++14", lang1) == 0 || strcmp ("GNU C++14", lang2) == 0)
@ -24597,7 +24601,8 @@ gen_compile_unit_die (const char *filename)
else if (strcmp (language_string, "GNU C++14") == 0)
language = DW_LANG_C_plus_plus_14;
else if (strcmp (language_string, "GNU C++17") == 0
|| strcmp (language_string, "GNU C++20") == 0)
|| strcmp (language_string, "GNU C++20") == 0
|| strcmp (language_string, "GNU C++23") == 0)
/* For now. */
language = DW_LANG_C_plus_plus_14;
}

4
gcc/testsuite/g++.dg/cpp23/cplusplus.C Normal file
View File

@ -0,0 +1,4 @@
// { dg-do compile }
// { dg-options "-std=c++23" }
static_assert(__cplusplus > 202002L);

28
gcc/testsuite/lib/target-supports.exp
View File

@ -9503,7 +9503,10 @@ proc check_effective_target_c++2a_only { } {
return 0
}
proc check_effective_target_c++2a { } {
return [check_effective_target_c++2a_only]
if [check_effective_target_c++2a_only] {
return 1
}
return [check_effective_target_c++23]
}
proc check_effective_target_c++20_only { } {
@ -9513,6 +9516,29 @@ proc check_effective_target_c++20_only { } {
proc check_effective_target_c++20 { } {
return [check_effective_target_c++2a]
}
proc check_effective_target_c++20_down { } {
if ![check_effective_target_c++] {
return 0
}
return [expr ![check_effective_target_c++23] ]
}
proc check_effective_target_c++23_only { } {
global cxx_default
if ![check_effective_target_c++] {
return 0
}
if [check-flags { { } { } { -std=c++23 -std=gnu++23 -std=c++2b -std=gnu++2b } }] {
return 1
}
if { $cxx_default == "c++23" && [check-flags { { } { } { } { -std=* } }] } {
return 1
}
return 0
}
proc check_effective_target_c++23 { } {
return [check_effective_target_c++23_only]
}
# Check for C++ Concepts support, i.e. -fconcepts flag.
proc check_effective_target_concepts { } {

3
libcpp/include/cpplib.h
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@ -173,7 +173,8 @@ enum c_lang {CLK_GNUC89 = 0, CLK_GNUC99, CLK_GNUC11, CLK_GNUC17, CLK_GNUC2X,
CLK_STDC2X,
CLK_GNUCXX, CLK_CXX98, CLK_GNUCXX11, CLK_CXX11,
CLK_GNUCXX14, CLK_CXX14, CLK_GNUCXX17, CLK_CXX17,
CLK_GNUCXX20, CLK_CXX20, CLK_ASM};
CLK_GNUCXX20, CLK_CXX20, CLK_GNUCXX23, CLK_CXX23,
CLK_ASM};
/* Payload of a NUMBER, STRING, CHAR or COMMENT token. */
struct GTY(()) cpp_string {

9
libcpp/init.c
View File

@ -119,6 +119,8 @@ static const struct lang_flags lang_defaults[] =
/* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 },
/* GNUCXX20 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
/* CXX20 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
/* GNUCXX23 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
/* CXX23 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
/* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};
@ -540,7 +542,12 @@ cpp_init_builtins (cpp_reader *pfile, int hosted)
if (CPP_OPTION (pfile, cplusplus))
{
if (CPP_OPTION (pfile, lang) == CLK_CXX20
/* C++23 is not yet a standard. For now, use an invalid
* year/month, 202100L, which is larger than 202002L. */
if (CPP_OPTION (pfile, lang) == CLK_CXX23
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX23)
_cpp_define_builtin (pfile, "__cplusplus 202100L");
else if (CPP_OPTION (pfile, lang) == CLK_CXX20
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX20)
_cpp_define_builtin (pfile, "__cplusplus 202002L");
else if (CPP_OPTION (pfile, lang) == CLK_CXX17