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Add support for -std=c++2a.

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* c-common.h (cxx_dialect): Add cxx2a as a dialect.
	* opt.c: Add options for -std=c++2a and -std=gnu++2a.
	* c-opts.c (set_std_cxx2a): New.
	(c_common_handle_option): Set options when -std=c++2a is enabled.
	(c_common_post_options): Adjust comments.
	(set_std_cxx14, set_std_cxx17): Likewise.

	* doc/cpp.texi (__cplusplus): Document value for -std=c++2a
	or -std=gnu+2a.
	* doc/invoke.texi: Document -std=c++2a and -std=gnu++2a.

	* lib/target-supports.exp (check_effective_target_c++17): Return
	1 also if check_effective_target_c++2a.
	(check_effective_target_c++17_down): New.
	(check_effective_target_c++2a_only): New.
	(check_effective_target_c++2a): New.
	* g++.dg/cpp2a/cplusplus.C: New.

	* include/cpplib.h (c_lang): Add CXX2A and GNUCXX2A.
	* init.c (lang_defaults): Add rows for CXX2A and GNUCXX2A.
	(cpp_init_builtins): Set __cplusplus to 201709L for C++2a.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r252850
This commit is contained in:
Andrew Sutton 2017-09-15 21:16:37 +00:00 committed by Jakub Jelinek
parent 41dfa93fb8
commit 026a79f70c
13 changed files with 129 additions and 8 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2017-09-15 Andrew Sutton <andrew.n.sutton@gmail.com>
Jakub Jelinek <jakub@redhat.com>
Add support for -std=c++2a.
* doc/cpp.texi (__cplusplus): Document value for -std=c++2a
or -std=gnu+2a.
* doc/invoke.texi: Document -std=c++2a and -std=gnu++2a.
2017-09-15 Steve Ellcey <sellcey@cavium.com>
PR target/82066

11
gcc/c-family/ChangeLog
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@ -1,3 +1,14 @@
2017-09-15 Andrew Sutton <andrew.n.sutton@gmail.com>
Jakub Jelinek <jakub@redhat.com>
Add support for -std=c++2a.
* c-common.h (cxx_dialect): Add cxx2a as a dialect.
* opt.c: Add options for -std=c++2a and -std=gnu++2a.
* c-opts.c (set_std_cxx2a): New.
(c_common_handle_option): Set options when -std=c++2a is enabled.
(c_common_post_options): Adjust comments.
(set_std_cxx14, set_std_cxx17): Likewise.
2017-09-15 Eric Botcazou <ebotcazou@adacore.com>
* c-pragma.c (handle_pragma_scalar_storage_order): Expand on error

4
gcc/c-family/c-common.h
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@ -703,7 +703,9 @@ enum cxx_dialect {
/* C++14 */
cxx14,
/* C++17 */
cxx17
cxx17,
/* C++2a (C++20?) */
cxx2a
};
/* The C++ dialect being used. C++98 is the default. */

29
gcc/c-family/c-opts.c
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@ -111,6 +111,7 @@ static void set_std_cxx98 (int);
static void set_std_cxx11 (int);
static void set_std_cxx14 (int);
static void set_std_cxx17 (int);
static void set_std_cxx2a (int);
static void set_std_c89 (int, int);
static void set_std_c99 (int);
static void set_std_c11 (int);
@ -637,6 +638,12 @@ c_common_handle_option (size_t scode, const char *arg, int value,
set_std_cxx17 (code == OPT_std_c__17 /* ISO */);
break;
case OPT_std_c__2a:
case OPT_std_gnu__2a:
if (!preprocessing_asm_p)
set_std_cxx2a (code == OPT_std_c__2a /* ISO */);
break;
case OPT_std_c90:
case OPT_std_iso9899_199409:
if (!preprocessing_asm_p)
@ -938,7 +945,7 @@ 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} default to -fno-ext-numeric-literals. */
for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
if (flag_iso && !global_options_set.x_flag_ext_numeric_literals)
cpp_opts->ext_numeric_literals = 0;
}
@ -1589,7 +1596,7 @@ set_std_cxx14 (int iso)
flag_no_gnu_keywords = iso;
flag_no_nonansi_builtin = iso;
flag_iso = iso;
/* C++11 includes the C99 standard library. */
/* C++14 includes the C99 standard library. */
flag_isoc94 = 1;
flag_isoc99 = 1;
cxx_dialect = cxx14;
@ -1604,7 +1611,7 @@ set_std_cxx17 (int iso)
flag_no_gnu_keywords = iso;
flag_no_nonansi_builtin = iso;
flag_iso = iso;
/* C++11 includes the C99 standard library. */
/* C++17 includes the C11 standard library. */
flag_isoc94 = 1;
flag_isoc99 = 1;
flag_isoc11 = 1;
@ -1612,6 +1619,22 @@ set_std_cxx17 (int iso)
lang_hooks.name = "GNU C++17";
}
/* Set the C++ 202a draft standard (without GNU extensions if ISO). */
static void
set_std_cxx2a (int iso)
{
cpp_set_lang (parse_in, iso ? CLK_CXX2A: CLK_GNUCXX2A);
flag_no_gnu_keywords = iso;
flag_no_nonansi_builtin = iso;
flag_iso = iso;
/* C++17 includes the C11 standard library. */
flag_isoc94 = 1;
flag_isoc99 = 1;
flag_isoc11 = 1;
cxx_dialect = cxx2a;
lang_hooks.name = "GNU C++17"; /* Pretend C++17 until standardization. */
}
/* Args to -d specify what to dump. Silently ignore
unrecognized options; they may be aimed at toplev.c. */
static void

8
gcc/c-family/c.opt
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@ -1932,6 +1932,10 @@ std=c++17
C++ ObjC++
Conform to the ISO 2017 C++ standard.
std=c++2a
C++ ObjC++
Conform to the ISO 2020(?) C++ draft standard (experimental and incomplete support).
std=c11
C ObjC
Conform to the ISO 2011 C standard.
@ -1990,6 +1994,10 @@ std=gnu++17
C++ ObjC++
Conform to the ISO 2017 C++ standard with GNU extensions.
std=gnu++2a
C++ ObjC++
Conform to the ISO 2020(?) C++ draft standard with GNU extensions (experimental and incomplete support).
std=gnu11
C ObjC
Conform to the ISO 2011 C standard with GNU extensions.

5
gcc/doc/cpp.texi
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@ -1877,7 +1877,10 @@ selected, the value of the macro is
@code{199711L} for the 1998 C++ standard,
@code{201103L} for the 2011 C++ standard,
@code{201402L} for the 2014 C++ standard,
@code{201703L} for the 2017 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}.
@item __OBJC__
This macro is defined, with value 1, when the Objective-C compiler is in

10
gcc/doc/invoke.texi
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@ -1880,6 +1880,16 @@ The name @samp{c++1z} is deprecated.
@itemx gnu++1z
GNU dialect of @option{-std=c++17}.
The name @samp{gnu++1z} is deprecated.
@item c++2a
The next revision of the ISO C++ standard, tentatively planned for
2020. Support is highly experimental, and will almost certainly
change in incompatible ways in future releases.
@item gnu++2a
GNU dialect of @option{-std=c++2a}. Support is highly experimental,
and will almost certainly change in incompatible ways in future
releases.
@end table
@item -fgnu89-inline

11
gcc/testsuite/ChangeLog
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@ -1,3 +1,14 @@
2017-09-15 Andrew Sutton <andrew.n.sutton@gmail.com>
Jakub Jelinek <jakub@redhat.com>
Add support for -std=c++2a.
* lib/target-supports.exp (check_effective_target_c++17): Return
1 also if check_effective_target_c++2a.
(check_effective_target_c++17_down): New.
(check_effective_target_c++2a_only): New.
(check_effective_target_c++2a): New.
* g++.dg/cpp2a/cplusplus.C: New.
2017-09-15 Joseph Myers <joseph@codesourcery.com>
PR c/82071

4
gcc/testsuite/g++.dg/cpp2a/cplusplus.C Normal file
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@ -0,0 +1,4 @@
// { dg-do compile }
// { dg-options "-std=c++2a" }
static_assert(__cplusplus > 201703L);

29
gcc/testsuite/lib/target-supports.exp
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@ -7863,8 +7863,35 @@ proc check_effective_target_c++17_only { } {
}
return 0
}
proc check_effective_target_c++17 { } {
return [check_effective_target_c++17_only]
if [check_effective_target_c++17_only] {
return 1
}
return [check_effective_target_c++2a]
}
proc check_effective_target_c++17_down { } {
if ![check_effective_target_c++] {
return 0
}
return [expr ![check_effective_target_c++2a] ]
}
proc check_effective_target_c++2a_only { } {
global cxx_default
if ![check_effective_target_c++] {
return 0
}
if [check-flags { { } { } { -std=c++2a -std=gnu++2a } }] {
return 1
}
if { $cxx_default == "c++20" && [check-flags { { } { } { } { -std=* } }] } {
return 1
}
return 0
}
proc check_effective_target_c++2a { } {
return [check_effective_target_c++2a_only]
}
# Check for C++ Concepts TS support, i.e. -fconcepts flag.

8
libcpp/ChangeLog
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@ -1,3 +1,11 @@
2017-09-15 Andrew Sutton <andrew.n.sutton@gmail.com>
Jakub Jelinek <jakub@redhat.com>
Add support for -std=c++2a.
* include/cpplib.h (c_lang): Add CXX2A and GNUCXX2A.
* init.c (lang_defaults): Add rows for CXX2A and GNUCXX2A.
(cpp_init_builtins): Set __cplusplus to 201709L for C++2a.
2017-09-15 Jakub Jelinek <jakub@redhat.com>
* include/cpplib.h (enum c_lang): Rename CLK_GNUCXX1Z

3
libcpp/include/cpplib.h
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@ -171,7 +171,8 @@ enum cpp_ttype
enum c_lang {CLK_GNUC89 = 0, CLK_GNUC99, CLK_GNUC11,
CLK_STDC89, CLK_STDC94, CLK_STDC99, CLK_STDC11,
CLK_GNUCXX, CLK_CXX98, CLK_GNUCXX11, CLK_CXX11,
CLK_GNUCXX14, CLK_CXX14, CLK_GNUCXX17, CLK_CXX17, CLK_ASM};
CLK_GNUCXX14, CLK_CXX14, CLK_GNUCXX17, CLK_CXX17,
CLK_GNUCXX2A, CLK_CXX2A, CLK_ASM};
/* Payload of a NUMBER, STRING, CHAR or COMMENT token. */
struct GTY(()) cpp_string {

7
libcpp/init.c
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@ -110,6 +110,8 @@ static const struct lang_flags lang_defaults[] =
/* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0 },
/* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1 },
/* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1 },
/* GNUCXX2A */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1 },
/* CXX2A */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1 },
/* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};
@ -497,7 +499,10 @@ cpp_init_builtins (cpp_reader *pfile, int hosted)
if (CPP_OPTION (pfile, cplusplus))
{
if (CPP_OPTION (pfile, lang) == CLK_CXX17
if (CPP_OPTION (pfile, lang) == CLK_CXX2A
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX2A)
_cpp_define_builtin (pfile, "__cplusplus 201709L");
else if (CPP_OPTION (pfile, lang) == CLK_CXX17
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX17)
_cpp_define_builtin (pfile, "__cplusplus 201703L");
else if (CPP_OPTION (pfile, lang) == CLK_CXX14