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m4/std-gnu11.m4
845 строк
25 KB
Mark Wielaard
Update minimum C compiler supported to C11 plus stdatomic.h
11 янв 2025, 02:19
11 янв 2025, 02:19
d5fe635
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# std-gnu11.m4 # serial 3 # Prefer GNU C11 and C++11 to earlier versions. -*- coding: utf-8 -*- # The std-gnu23 module, which defines _AC_C_C23_OPTIONS, supersedes us. m4_ifndef([_AC_C_C23_OPTIONS], [ # This implementation is taken from GNU Autoconf lib/autoconf/c.m4 # commit 017d5ddd82854911f0119691d91ea8a1438824d6 # dated Sun Apr 3 13:57:17 2016 -0700 # with minor changes to commentary. # This implementation will be obsolete once we can assume Autoconf 2.70 # or later is installed everywhere a Gnulib program might be developed. m4_version_prereq([2.70], [], [ # Copyright (C) 2001-2024 Free Software Foundation, Inc. # This file is part of Autoconf. This program is free # software; you can redistribute it and/or modify it under the # terms of the GNU General Public License as published by the # Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # Under Section 7 of GPL version 3, you are granted additional # permissions described in the Autoconf Configure Script Exception, # version 3.0, as published by the Free Software Foundation. # # You should have received a copy of the GNU General Public License # and a copy of the Autoconf Configure Script Exception along with # this program; see the files COPYINGv3 and COPYING.EXCEPTION # respectively. If not, see <https://www.gnu.org/licenses/> and # <https://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=blob_plain;f=COPYING.EXCEPTION>. # Written by David MacKenzie, with help from # Akim Demaille, Paul Eggert, # François Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor, # Roland McGrath, Noah Friedman, david d zuhn, and many others. # AC_PROG_CC([COMPILER ...]) # -------------------------- # COMPILER ... is a space separated list of C compilers to search for. # This just gives the user an opportunity to specify an alternative # search list for the C compiler. AC_DEFUN([AC_PROG_CC], [AC_LANG_PUSH(C)dnl AC_ARG_VAR([CC], [C compiler command])dnl AC_ARG_VAR([CFLAGS], [C compiler flags])dnl _AC_ARG_VAR_LDFLAGS()dnl _AC_ARG_VAR_LIBS()dnl _AC_ARG_VAR_CPPFLAGS()dnl m4_ifval([$1], [AC_CHECK_TOOLS(CC, [$1])], [AC_CHECK_TOOL(CC, gcc) if test -z "$CC"; then dnl Here we want: dnl AC_CHECK_TOOL(CC, cc) dnl but without the check for a tool without the prefix. dnl Until the check is removed from there, copy the code: if test -n "$ac_tool_prefix"; then AC_CHECK_PROG(CC, [${ac_tool_prefix}cc], [${ac_tool_prefix}cc]) fi fi if test -z "$CC"; then AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc) fi if test -z "$CC"; then AC_CHECK_TOOLS(CC, cl.exe) fi if test -z "$CC"; then AC_CHECK_TOOL(CC, clang) fi ]) test -z "$CC" && AC_MSG_FAILURE([no acceptable C compiler found in \$PATH]) # Provide some information about the compiler. _AS_ECHO_LOG([checking for _AC_LANG compiler version]) set X $ac_compile ac_compiler=$[2] for ac_option in --version -v -V -qversion -version; do _AC_DO_LIMIT([$ac_compiler $ac_option >&AS_MESSAGE_LOG_FD]) done m4_expand_once([_AC_COMPILER_EXEEXT])[]dnl m4_expand_once([_AC_COMPILER_OBJEXT])[]dnl _AC_LANG_COMPILER_GNU if test $ac_compiler_gnu = yes; then GCC=yes else GCC= fi _AC_PROG_CC_G dnl dnl Set ac_prog_cc_stdc to the supported C version. dnl Also set the documented variable ac_cv_prog_cc_stdc; dnl its name was chosen when it was cached, but it is no longer cached. _AC_PROG_CC_C11([ac_prog_cc_stdc=c11 ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c11], [_AC_PROG_CC_C99([ac_prog_cc_stdc=c99 ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c99], [_AC_PROG_CC_C89([ac_prog_cc_stdc=c89 ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c89], [ac_prog_cc_stdc=no ac_cv_prog_cc_stdc=no])])]) dnl AC_LANG_POP(C)dnl ])# AC_PROG_CC # AC_PROG_CXX([LIST-OF-COMPILERS]) # -------------------------------- # LIST-OF-COMPILERS is a space separated list of C++ compilers to search # for (if not specified, a default list is used). This just gives the # user an opportunity to specify an alternative search list for the C++ # compiler. # aCC HP-UX C++ compiler much better than `CC', so test before. # FCC Fujitsu C++ compiler # KCC KAI C++ compiler # RCC Rational C++ # xlC_r AIX C Set++ (with support for reentrant code) # xlC AIX C Set++ AC_DEFUN([AC_PROG_CXX], [AC_LANG_PUSH(C++)dnl AC_ARG_VAR([CXX], [C++ compiler command])dnl AC_ARG_VAR([CXXFLAGS], [C++ compiler flags])dnl _AC_ARG_VAR_LDFLAGS()dnl _AC_ARG_VAR_LIBS()dnl _AC_ARG_VAR_CPPFLAGS()dnl _AC_ARG_VAR_PRECIOUS([CCC])dnl if test -z "$CXX"; then if test -n "$CCC"; then CXX=$CCC else AC_CHECK_TOOLS(CXX, [m4_default([$1], [g++ c++ gpp aCC CC cxx cc++ cl.exe FCC KCC RCC xlC_r xlC clang++])], g++) fi fi # Provide some information about the compiler. _AS_ECHO_LOG([checking for _AC_LANG compiler version]) set X $ac_compile ac_compiler=$[2] for ac_option in --version -v -V -qversion; do _AC_DO_LIMIT([$ac_compiler $ac_option >&AS_MESSAGE_LOG_FD]) done m4_expand_once([_AC_COMPILER_EXEEXT])[]dnl m4_expand_once([_AC_COMPILER_OBJEXT])[]dnl _AC_LANG_COMPILER_GNU if test $ac_compiler_gnu = yes; then GXX=yes else GXX= fi _AC_PROG_CXX_G _AC_PROG_CXX_CXX11([ac_prog_cxx_stdcxx=cxx11 ac_cv_prog_cxx_stdcxx=$ac_cv_prog_cxx_cxx11 ac_cv_prog_cxx_cxx98=$ac_cv_prog_cxx_cxx11], [_AC_PROG_CXX_CXX98([ac_prog_cxx_stdcxx=cxx98 ac_cv_prog_cxx_stdcxx=$ac_cv_prog_cxx_cxx98], [ac_prog_cxx_stdcxx=no ac_cv_prog_cxx_stdcxx=no])]) AC_LANG_POP(C++)dnl ])# AC_PROG_CXX # _AC_C_STD_TRY(STANDARD, TEST-PROLOGUE, TEST-BODY, OPTION-LIST, # ACTION-IF-AVAILABLE, ACTION-IF-UNAVAILABLE) # -------------------------------------------------------------- # Check whether the C compiler accepts features of STANDARD (e.g `c89', `c99') # by trying to compile a program of TEST-PROLOGUE and TEST-BODY. If this fails, # try again with each compiler option in the space-separated OPTION-LIST; if one # helps, append it to CC. If eventually successful, run ACTION-IF-AVAILABLE, # else ACTION-IF-UNAVAILABLE. AC_DEFUN([_AC_C_STD_TRY], [AC_MSG_CHECKING([for $CC option to enable ]m4_translit($1, [c], [C])[ features]) AC_CACHE_VAL(ac_cv_prog_cc_$1, [ac_cv_prog_cc_$1=no ac_save_CC=$CC AC_LANG_CONFTEST([AC_LANG_PROGRAM([$2], [$3])]) for ac_arg in '' $4 do CC="$ac_save_CC $ac_arg" _AC_COMPILE_IFELSE([], [ac_cv_prog_cc_$1=$ac_arg]) test "x$ac_cv_prog_cc_$1" != "xno" && break done rm -f conftest.$ac_ext CC=$ac_save_CC ])# AC_CACHE_VAL ac_prog_cc_stdc_options= case "x$ac_cv_prog_cc_$1" in x) AC_MSG_RESULT([none needed]) ;; xno) AC_MSG_RESULT([unsupported]) ;; *) ac_prog_cc_stdc_options=" $ac_cv_prog_cc_$1" CC=$CC$ac_prog_cc_stdc_options AC_MSG_RESULT([$ac_cv_prog_cc_$1]) ;; esac AS_IF([test "x$ac_cv_prog_cc_$1" != xno], [$5], [$6]) ])# _AC_C_STD_TRY # _AC_C_C99_TEST_HEADER # --------------------- # A C header suitable for testing for C99. AC_DEFUN([_AC_C_C99_TEST_HEADER], [[#include <stdarg.h> #include <stdbool.h> #include <stddef.h> #include <stdlib.h> #include <wchar.h> #include <stdio.h> // Check varargs macros. These examples are taken from C99 6.10.3.5. #define debug(...) fprintf (stderr, __VA_ARGS__) #define showlist(...) puts (#__VA_ARGS__) #define report(test,...) ((test) ? puts (#test) : printf (__VA_ARGS__)) static void test_varargs_macros (void) { int x = 1234; int y = 5678; debug ("Flag"); debug ("X = %d\n", x); showlist (The first, second, and third items.); report (x>y, "x is %d but y is %d", x, y); } // Check long long types. #define BIG64 18446744073709551615ull #define BIG32 4294967295ul #define BIG_OK (BIG64 / BIG32 == 4294967297ull && BIG64 % BIG32 == 0) #if !BIG_OK your preprocessor is broken; #endif #if BIG_OK #else your preprocessor is broken; #endif static long long int bignum = -9223372036854775807LL; static unsigned long long int ubignum = BIG64; struct incomplete_array { int datasize; double data[]; }; struct named_init { int number; const wchar_t *name; double average; }; typedef const char *ccp; static inline int test_restrict (ccp restrict text) { // See if C++-style comments work. // Iterate through items via the restricted pointer. // Also check for declarations in for loops. for (unsigned int i = 0; *(text+i) != '\0'; ++i) continue; return 0; } // Check varargs and va_copy. static bool test_varargs (const char *format, ...) { va_list args; va_start (args, format); va_list args_copy; va_copy (args_copy, args); const char *str = ""; int number = 0; float fnumber = 0; while (*format) { switch (*format++) { case 's': // string str = va_arg (args_copy, const char *); break; case 'd': // int number = va_arg (args_copy, int); break; case 'f': // float fnumber = va_arg (args_copy, double); break; default: break; } } va_end (args_copy); va_end (args); return *str && number && fnumber; }]])# _AC_C_C99_TEST_HEADER # _AC_C_C99_TEST_BODY # ------------------- # A C body suitable for testing for C99, assuming the corresponding header. AC_DEFUN([_AC_C_C99_TEST_BODY], [[ // Check bool. _Bool success = false; // Check restrict. if (test_restrict ("String literal") == 0) success = true; char *restrict newvar = "Another string"; // Check varargs. success &= test_varargs ("s, d' f .", "string", 65, 34.234); test_varargs_macros (); // Check flexible array members. struct incomplete_array *ia = malloc (sizeof (struct incomplete_array) + (sizeof (double) * 10)); ia->datasize = 10; for (int i = 0; i < ia->datasize; ++i) ia->data[i] = i * 1.234; // Check named initializers. struct named_init ni = { .number = 34, .name = L"Test wide string", .average = 543.34343, }; ni.number = 58; int dynamic_array[ni.number]; dynamic_array[ni.number - 1] = 543; // work around unused variable warnings return (!success || bignum == 0LL || ubignum == 0uLL || newvar[0] == 'x' || dynamic_array[ni.number - 1] != 543); ]]) # _AC_PROG_CC_C99 ([ACTION-IF-AVAILABLE], [ACTION-IF-UNAVAILABLE]) # ---------------------------------------------------------------- # If the C compiler is not in ISO C99 mode by default, try to add an # option to output variable CC to make it so. This macro tries # various options that select ISO C99 on some system or another. It # considers the compiler to be in ISO C99 mode if it handles _Bool, # // comments, flexible array members, inline, long long int, mixed # code and declarations, named initialization of structs, restrict, # va_copy, varargs macros, variable declarations in for loops and # variable length arrays. AC_DEFUN([_AC_PROG_CC_C99], [_AC_C_STD_TRY([c99], [_AC_C_C99_TEST_HEADER], [_AC_C_C99_TEST_BODY], dnl Try dnl GCC -std=gnu99 (unused restrictive modes: -std=c99 -std=iso9899:1999) dnl IBM XL C -qlanglvl=extc1x (V12.1; does not pass C11 test) dnl IBM XL C -qlanglvl=extc99 dnl (pre-V12.1; unused restrictive mode: -qlanglvl=stdc99) dnl HP cc -AC99 dnl Intel ICC -std=c99, -c99 (deprecated) dnl IRIX -c99 dnl Solaris -D_STDC_C99= dnl cc's -xc99 option uses linker magic to define the external dnl symbol __xpg4 as if by "int __xpg4 = 1;", which enables C99 dnl behavior for C library functions. This is not wanted here, dnl because it means that a single module compiled with -xc99 dnl alters C runtime behavior for the entire program, not for dnl just the module. Instead, define the (private) symbol dnl _STDC_C99, which suppresses a bogus failure in <stdbool.h>. dnl The resulting compiler passes the test case here, and that's dnl good enough. For more, please see the thread starting at: dnl https://lists.gnu.org/r/autoconf/2010-12/msg00059.html dnl Tru64 -c99 dnl with extended modes being tried first. [[-std=gnu99 -std=c99 -c99 -AC99 -D_STDC_C99= -qlanglvl=extc1x -qlanglvl=extc99]], [$1], [$2])[]dnl ])# _AC_PROG_CC_C99 # _AC_PROG_CC_C11 ([ACTION-IF-AVAILABLE], [ACTION-IF-UNAVAILABLE]) # ---------------------------------------------------------------- # If the C compiler is not in ISO C11 mode by default, try to add an # option to output variable CC to make it so. This macro tries # various options that select ISO C11 on some system or another. It # considers the compiler to be in ISO C11 mode if it handles _Alignas, # _Alignof, _Noreturn, _Static_assert, UTF-8 string literals, # duplicate typedefs, and anonymous structures and unions. AC_DEFUN([_AC_PROG_CC_C11], [_AC_C_STD_TRY([c11], [_AC_C_C99_TEST_HEADER[ // Check _Alignas. char _Alignas (double) aligned_as_double; char _Alignas (0) no_special_alignment; extern char aligned_as_int; char _Alignas (0) _Alignas (int) aligned_as_int; // Check _Alignof. enum { int_alignment = _Alignof (int), int_array_alignment = _Alignof (int[100]), char_alignment = _Alignof (char) }; _Static_assert (0 < -_Alignof (int), "_Alignof is signed"); // Check _Noreturn. int _Noreturn does_not_return (void) { for (;;) continue; } // Check _Static_assert. struct test_static_assert { int x; _Static_assert (sizeof (int) <= sizeof (long int), "_Static_assert does not work in struct"); long int y; }; // Check UTF-8 literals. #define u8 syntax error! char const utf8_literal[] = u8"happens to be ASCII" "another string"; // Check duplicate typedefs. typedef long *long_ptr; typedef long int *long_ptr; typedef long_ptr long_ptr; // Anonymous structures and unions -- taken from C11 6.7.2.1 Example 1. struct anonymous { union { struct { int i; int j; }; struct { int k; long int l; } w; }; int m; } v1; ]], [_AC_C_C99_TEST_BODY[ v1.i = 2; v1.w.k = 5; _Static_assert ((offsetof (struct anonymous, i) == offsetof (struct anonymous, w.k)), "Anonymous union alignment botch"); ]], dnl Try dnl GCC -std=gnu11 (unused restrictive mode: -std=c11) dnl with extended modes being tried first. dnl dnl Do not try -qlanglvl=extc1x, because IBM XL C V12.1 (the latest version as dnl of September 2012) does not pass the C11 test. For now, try extc1x when dnl compiling the C99 test instead, since it enables _Static_assert and dnl _Noreturn, which is a win. If -qlanglvl=extc11 or -qlanglvl=extc1x passes dnl the C11 test in some future version of IBM XL C, we'll add it here, dnl preferably extc11. [[-std=gnu11]], [$1], [$2])[]dnl ])# _AC_PROG_CC_C11 # AC_PROG_CC_C89 # -------------- # Do not use AU_ALIAS here and in AC_PROG_CC_C99 and AC_PROG_CC_STDC, # as that'd be incompatible with how Automake redefines AC_PROG_CC. See # <https://lists.gnu.org/r/autoconf/2012-10/msg00048.html>. AU_DEFUN([AC_PROG_CC_C89], [AC_REQUIRE([AC_PROG_CC])], [$0 is obsolete; use AC_PROG_CC] ) # AC_PROG_CC_C99 # -------------- AU_DEFUN([AC_PROG_CC_C99], [AC_REQUIRE([AC_PROG_CC])], [$0 is obsolete; use AC_PROG_CC] ) # AC_PROG_CC_STDC # --------------- AU_DEFUN([AC_PROG_CC_STDC], [AC_REQUIRE([AC_PROG_CC])], [$0 is obsolete; use AC_PROG_CC] ) # AC_C_PROTOTYPES # --------------- # Check if the C compiler supports prototypes, included if it needs # options. AC_DEFUN([AC_C_PROTOTYPES], [AC_REQUIRE([AC_PROG_CC])dnl if test "$ac_prog_cc_stdc" != no; then AC_DEFINE(PROTOTYPES, 1, [Define to 1 if the C compiler supports function prototypes.]) AC_DEFINE(__PROTOTYPES, 1, [Define like PROTOTYPES; this can be used by system headers.]) fi ])# AC_C_PROTOTYPES # _AC_CXX_STD_TRY(STANDARD, TEST-PROLOGUE, TEST-BODY, OPTION-LIST, # ACTION-IF-AVAILABLE, ACTION-IF-UNAVAILABLE) # ---------------------------------------------------------------- # Check whether the C++ compiler accepts features of STANDARD (e.g # `cxx98', `cxx11') by trying to compile a program of TEST-PROLOGUE # and TEST-BODY. If this fails, try again with each compiler option # in the space-separated OPTION-LIST; if one helps, append it to CXX. # If eventually successful, run ACTION-IF-AVAILABLE, else # ACTION-IF-UNAVAILABLE. AC_DEFUN([_AC_CXX_STD_TRY], [AC_MSG_CHECKING([for $CXX option to enable ]m4_translit(m4_translit($1, [x], [+]), [a-z], [A-Z])[ features]) AC_LANG_PUSH(C++)dnl AC_CACHE_VAL(ac_cv_prog_cxx_$1, [ac_cv_prog_cxx_$1=no ac_save_CXX=$CXX AC_LANG_CONFTEST([AC_LANG_PROGRAM([$2], [$3])]) for ac_arg in '' $4 do CXX="$ac_save_CXX $ac_arg" _AC_COMPILE_IFELSE([], [ac_cv_prog_cxx_$1=$ac_arg]) test "x$ac_cv_prog_cxx_$1" != "xno" && break done rm -f conftest.$ac_ext CXX=$ac_save_CXX ])# AC_CACHE_VAL ac_prog_cxx_stdcxx_options= case "x$ac_cv_prog_cxx_$1" in x) AC_MSG_RESULT([none needed]) ;; xno) AC_MSG_RESULT([unsupported]) ;; *) ac_prog_cxx_stdcxx_options=" $ac_cv_prog_cxx_$1" CXX=$CXX$ac_prog_cxx_stdcxx_options AC_MSG_RESULT([$ac_cv_prog_cxx_$1]) ;; esac AC_LANG_POP(C++)dnl AS_IF([test "x$ac_cv_prog_cxx_$1" != xno], [$5], [$6]) ])# _AC_CXX_STD_TRY # _AC_CXX_CXX98_TEST_HEADER # ------------------------- # A C++ header suitable for testing for CXX98. AC_DEFUN([_AC_CXX_CXX98_TEST_HEADER], [[ #include <algorithm> #include <cstdlib> #include <fstream> #include <iomanip> #include <iostream> #include <list> #include <map> #include <set> #include <sstream> #include <stdexcept> #include <string> #include <utility> #include <vector> namespace test { typedef std::vector<std::string> string_vec; typedef std::pair<int,bool> map_value; typedef std::map<std::string,map_value> map_type; typedef std::set<int> set_type; template<typename T> class printer { public: printer(std::ostringstream& os): os(os) {} void operator() (T elem) { os << elem << std::endl; } private: std::ostringstream& os; }; } ]])# _AC_CXX_CXX98_TEST_HEADER # _AC_CXX_CXX98_TEST_BODY # ----------------------- # A C++ body suitable for testing for CXX98, assuming the corresponding header. AC_DEFUN([_AC_CXX_CXX98_TEST_BODY], [[ try { // Basic string. std::string teststr("ASCII text"); teststr += " string"; // Simple vector. test::string_vec testvec; testvec.push_back(teststr); testvec.push_back("foo"); testvec.push_back("bar"); if (testvec.size() != 3) { throw std::runtime_error("vector size is not 1"); } // Dump vector into stringstream and obtain string. std::ostringstream os; for (test::string_vec::const_iterator i = testvec.begin(); i != testvec.end(); ++i) { if (i + 1 != testvec.end()) { os << teststr << '\n'; } } // Check algorithms work. std::for_each(testvec.begin(), testvec.end(), test::printer<std::string>(os)); std::string os_out = os.str(); // Test pair and map. test::map_type testmap; testmap.insert(std::make_pair(std::string("key"), std::make_pair(53,false))); // Test set. int values[] = {9, 7, 13, 15, 4, 18, 12, 10, 5, 3, 14, 19, 17, 8, 6, 20, 16, 2, 11, 1}; test::set_type testset(values, values + sizeof(values)/sizeof(values[0])); std::list<int> testlist(testset.begin(), testset.end()); std::copy(testset.begin(), testset.end(), std::back_inserter(testlist)); } catch (const std::exception& e) { std::cerr << "Caught exception: " << e.what() << std::endl; // Test fstream std::ofstream of("test.txt"); of << "Test ASCII text\n" << std::flush; of << "N= " << std::hex << std::setw(8) << std::left << 534 << std::endl; of.close(); } std::exit(0); ]]) # _AC_CXX_CXX11_TEST_HEADER # ------------------------- # A C++ header suitable for testing for CXX11. AC_DEFUN([_AC_CXX_CXX11_TEST_HEADER], [[ #include <deque> #include <functional> #include <memory> #include <tuple> #include <array> #include <regex> #include <iostream> namespace cxx11test { typedef std::shared_ptr<std::string> sptr; typedef std::weak_ptr<std::string> wptr; typedef std::tuple<std::string,int,double> tp; typedef std::array<int, 20> int_array; constexpr int get_val() { return 20; } struct testinit { int i; double d; }; class delegate { public: delegate(int n) : n(n) {} delegate(): delegate(2354) {} virtual int getval() { return this->n; }; protected: int n; }; class overridden : public delegate { public: overridden(int n): delegate(n) {} virtual int getval() override final { return this->n * 2; } }; class nocopy { public: nocopy(int i): i(i) {} nocopy() = default; nocopy(const nocopy&) = delete; nocopy & operator=(const nocopy&) = delete; private: int i; }; } ]])# _AC_CXX_CXX11_TEST_HEADER # _AC_CXX_CXX11_TEST_BODY # ----------------------- # A C++ body suitable for testing for CXX11, assuming the corresponding header. AC_DEFUN([_AC_CXX_CXX11_TEST_BODY], [[ { // Test auto and decltype std::deque<int> d; d.push_front(43); d.push_front(484); d.push_front(3); d.push_front(844); int total = 0; for (auto i = d.begin(); i != d.end(); ++i) { total += *i; } auto a1 = 6538; auto a2 = 48573953.4; auto a3 = "String literal"; decltype(a2) a4 = 34895.034; } { // Test constexpr short sa[cxx11test::get_val()] = { 0 }; } { // Test initializer lists cxx11test::testinit il = { 4323, 435234.23544 }; } { // Test range-based for and lambda cxx11test::int_array array = {9, 7, 13, 15, 4, 18, 12, 10, 5, 3, 14, 19, 17, 8, 6, 20, 16, 2, 11, 1}; for (int &x : array) { x += 23; } std::for_each(array.begin(), array.end(), [](int v1){ std::cout << v1; }); } { using cxx11test::sptr; using cxx11test::wptr; sptr sp(new std::string("ASCII string")); wptr wp(sp); sptr sp2(wp); } { cxx11test::tp tuple("test", 54, 45.53434); double d = std::get<2>(tuple); std::string s; int i; std::tie(s,i,d) = tuple; } { static std::regex filename_regex("^_?([a-z0-9_.]+-)+[a-z0-9]+$"); std::string testmatch("Test if this string matches"); bool match = std::regex_search(testmatch, filename_regex); } { cxx11test::int_array array = {9, 7, 13, 15, 4, 18, 12, 10, 5, 3, 14, 19, 17, 8, 6, 20, 16, 2, 11, 1}; cxx11test::int_array::size_type size = array.size(); } { // Test constructor delegation cxx11test::delegate d1; cxx11test::delegate d2(); cxx11test::delegate d3(45); } { // Test override and final cxx11test::overridden o1(55464); } { // Test nullptr char *c = nullptr; } { // Test template brackets std::vector<std::pair<int,char*>> v1; } { // Unicode literals char const *utf8 = u8"UTF-8 string \u2500"; char16_t const *utf16 = u"UTF-8 string \u2500"; char32_t const *utf32 = U"UTF-32 string \u2500"; } ]]) # _AC_PROG_CXX_CXX98 ([ACTION-IF-AVAILABLE], [ACTION-IF-UNAVAILABLE]) # ------------------------------------------------------------------- # If the C++ compiler is not in ISO C++98 mode by default, try to add # an option to output variable CXX to make it so. This macro tries # various options that select ISO C++98 on some system or another. It # considers the compiler to be in ISO C++98 mode if it handles basic # features of the std namespace including: string, containers (list, # map, set, vector), streams (fstreams, iostreams, stringstreams, # iomanip), pair, exceptions and algorithms. AC_DEFUN([_AC_PROG_CXX_CXX98], [_AC_CXX_STD_TRY([cxx98], [_AC_CXX_CXX98_TEST_HEADER], [_AC_CXX_CXX98_TEST_BODY], dnl Try dnl GCC -std=gnu++98 (unused restrictive mode: -std=c++98) dnl IBM XL C -qlanglvl=extended dnl HP aC++ -AA dnl Intel ICC -std=gnu++98 dnl Solaris N/A (default) dnl Tru64 N/A (default, but -std gnu could be used) dnl with extended modes being tried first. [[-std=gnu++98 -std=c++98 -qlanglvl=extended -AA]], [$1], [$2])[]dnl ])# _AC_PROG_CXX_CXX98 # _AC_PROG_CXX_CXX11 ([ACTION-IF-AVAILABLE], [ACTION-IF-UNAVAILABLE]) # ------------------------------------------------------------------- # If the C++ compiler is not in ISO CXX11 mode by default, try to add # an option to output variable CXX to make it so. This macro tries # various options that select ISO C++11 on some system or another. It # considers the compiler to be in ISO C++11 mode if it handles all the # tests from the C++98 checks, plus the following: Language features # (auto, constexpr, decltype, default/deleted constructors, delegate # constructors, final, initializer lists, lambda functions, nullptr, # override, range-based for loops, template brackets without spaces, # unicode literals) and library features (array, memory (shared_ptr, # weak_ptr), regex and tuple types). AC_DEFUN([_AC_PROG_CXX_CXX11], [_AC_CXX_STD_TRY([cxx11], [_AC_CXX_CXX11_TEST_HEADER _AC_CXX_CXX98_TEST_HEADER], [_AC_CXX_CXX11_TEST_BODY _AC_CXX_CXX98_TEST_BODY], dnl Try dnl GCC -std=gnu++11 (unused restrictive mode: -std=c++11) [and 0x variants] dnl IBM XL C -qlanglvl=extended0x dnl (pre-V12.1; unused restrictive mode: -qlanglvl=stdcxx11) dnl HP aC++ -AA dnl Intel ICC -std=c++11 -std=c++0x dnl Solaris N/A (no support) dnl Tru64 N/A (no support) dnl with extended modes being tried first. [[-std=gnu++11 -std=c++11 -std=gnu++0x -std=c++0x -qlanglvl=extended0x -AA]], [$1], [$2])[]dnl ])# _AC_PROG_CXX_CXX11 ])# m4_version_prereq ])# !_AC_C_C23_OPTIONS