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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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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