diff --git a/configure b/configure index b7897446c70..a0c5aca9e8d 100755 --- a/configure +++ b/configure @@ -694,6 +694,7 @@ extra_mpc_gmp_configure_flags extra_mpfr_configure_flags gmpinc gmplibs +HAVE_CXX11 do_compare GNATMAKE GNATBIND @@ -5524,9 +5525,1002 @@ $as_echo "$as_me: WARNING: trying to bootstrap a cross compiler" >&2;} esac # When bootstrapping with GCC, build stage 1 in C++11 mode to ensure that a -# C++11 compiler can still start the bootstrap. +# C++11 compiler can still start the bootstrap. Otherwise, if building GCC, +# require C++11 (or higher). if test "$enable_bootstrap:$GXX" = "yes:yes"; then CXX="$CXX -std=c++11" +elif test "$have_compiler" = yes; then + ax_cxx_compile_alternatives="11 0x" ax_cxx_compile_cxx11_required=true + ac_ext=cpp +ac_cpp='$CXXCPP $CPPFLAGS' +ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5' +ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' +ac_compiler_gnu=$ac_cv_cxx_compiler_gnu + ac_success=no + + { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features by default" >&5 +$as_echo_n "checking whether $CXX supports C++11 features by default... " >&6; } +if ${ax_cv_cxx_compile_cxx11+:} false; then : + $as_echo_n "(cached) " >&6 +else + cat confdefs.h - <<_ACEOF >conftest.$ac_ext +/* end confdefs.h. */ + + +// If the compiler admits that it is not ready for C++11, why torture it? +// Hopefully, this will speed up the test. + +#ifndef __cplusplus + +#error "This is not a C++ compiler" + +#elif __cplusplus < 201103L + +#error "This is not a C++11 compiler" + +#else + +namespace cxx11 +{ + + namespace test_static_assert + { + + template + struct check + { + static_assert(sizeof(int) <= sizeof(T), "not big enough"); + }; + + } + + namespace test_final_override + { + + struct Base + { + virtual ~Base() {} + virtual void f() {} + }; + + struct Derived : public Base + { + virtual ~Derived() override {} + virtual void f() override {} + }; + + } + + namespace test_double_right_angle_brackets + { + + template < typename T > + struct check {}; + + typedef check single_type; + typedef check> double_type; + typedef check>> triple_type; + typedef check>>> quadruple_type; + + } + + namespace test_decltype + { + + int + f() + { + int a = 1; + decltype(a) b = 2; + return a + b; + } + + } + + namespace test_type_deduction + { + + template < typename T1, typename T2 > + struct is_same + { + static const bool value = false; + }; + + template < typename T > + struct is_same + { + static const bool value = true; + }; + + template < typename T1, typename T2 > + auto + add(T1 a1, T2 a2) -> decltype(a1 + a2) + { + return a1 + a2; + } + + int + test(const int c, volatile int v) + { + static_assert(is_same::value == true, ""); + static_assert(is_same::value == false, ""); + static_assert(is_same::value == false, ""); + auto ac = c; + auto av = v; + auto sumi = ac + av + 'x'; + auto sumf = ac + av + 1.0; + static_assert(is_same::value == true, ""); + static_assert(is_same::value == true, ""); + static_assert(is_same::value == true, ""); + static_assert(is_same::value == false, ""); + static_assert(is_same::value == true, ""); + return (sumf > 0.0) ? sumi : add(c, v); + } + + } + + namespace test_noexcept + { + + int f() { return 0; } + int g() noexcept { return 0; } + + static_assert(noexcept(f()) == false, ""); + static_assert(noexcept(g()) == true, ""); + + } + + namespace test_constexpr + { + + template < typename CharT > + unsigned long constexpr + strlen_c_r(const CharT *const s, const unsigned long acc) noexcept + { + return *s ? strlen_c_r(s + 1, acc + 1) : acc; + } + + template < typename CharT > + unsigned long constexpr + strlen_c(const CharT *const s) noexcept + { + return strlen_c_r(s, 0UL); + } + + static_assert(strlen_c("") == 0UL, ""); + static_assert(strlen_c("1") == 1UL, ""); + static_assert(strlen_c("example") == 7UL, ""); + static_assert(strlen_c("another\0example") == 7UL, ""); + + } + + namespace test_rvalue_references + { + + template < int N > + struct answer + { + static constexpr int value = N; + }; + + answer<1> f(int&) { return answer<1>(); } + answer<2> f(const int&) { return answer<2>(); } + answer<3> f(int&&) { return answer<3>(); } + + void + test() + { + int i = 0; + const int c = 0; + static_assert(decltype(f(i))::value == 1, ""); + static_assert(decltype(f(c))::value == 2, ""); + static_assert(decltype(f(0))::value == 3, ""); + } + + } + + namespace test_uniform_initialization + { + + struct test + { + static const int zero {}; + static const int one {1}; + }; + + static_assert(test::zero == 0, ""); + static_assert(test::one == 1, ""); + + } + + namespace test_lambdas + { + + void + test1() + { + auto lambda1 = [](){}; + auto lambda2 = lambda1; + lambda1(); + lambda2(); + } + + int + test2() + { + auto a = [](int i, int j){ return i + j; }(1, 2); + auto b = []() -> int { return '0'; }(); + auto c = [=](){ return a + b; }(); + auto d = [&](){ return c; }(); + auto e = [a, &b](int x) mutable { + const auto identity = [](int y){ return y; }; + for (auto i = 0; i < a; ++i) + a += b--; + return x + identity(a + b); + }(0); + return a + b + c + d + e; + } + + int + test3() + { + const auto nullary = [](){ return 0; }; + const auto unary = [](int x){ return x; }; + using nullary_t = decltype(nullary); + using unary_t = decltype(unary); + const auto higher1st = [](nullary_t f){ return f(); }; + const auto higher2nd = [unary](nullary_t f1){ + return [unary, f1](unary_t f2){ return f2(unary(f1())); }; + }; + return higher1st(nullary) + higher2nd(nullary)(unary); + } + + } + + namespace test_variadic_templates + { + + template + struct sum; + + template + struct sum + { + static constexpr auto value = N0 + sum::value; + }; + + template <> + struct sum<> + { + static constexpr auto value = 0; + }; + + static_assert(sum<>::value == 0, ""); + static_assert(sum<1>::value == 1, ""); + static_assert(sum<23>::value == 23, ""); + static_assert(sum<1, 2>::value == 3, ""); + static_assert(sum<5, 5, 11>::value == 21, ""); + static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, ""); + + } + + // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae + // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function + // because of this. + namespace test_template_alias_sfinae + { + + struct foo {}; + + template + using member = typename T::member_type; + + template + void func(...) {} + + template + void func(member*) {} + + void test(); + + void test() { func(0); } + + } + +} // namespace cxx11 + +#endif // __cplusplus >= 201103L + + + +_ACEOF +if ac_fn_cxx_try_compile "$LINENO"; then : + ax_cv_cxx_compile_cxx11=yes +else + ax_cv_cxx_compile_cxx11=no +fi +rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_cxx_compile_cxx11" >&5 +$as_echo "$ax_cv_cxx_compile_cxx11" >&6; } + if test x$ax_cv_cxx_compile_cxx11 = xyes; then + ac_success=yes + fi + + if test x$ac_success = xno; then + for alternative in ${ax_cxx_compile_alternatives}; do + switch="-std=gnu++${alternative}" + cachevar=`$as_echo "ax_cv_cxx_compile_cxx11_$switch" | $as_tr_sh` + { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features with $switch" >&5 +$as_echo_n "checking whether $CXX supports C++11 features with $switch... " >&6; } +if eval \${$cachevar+:} false; then : + $as_echo_n "(cached) " >&6 +else + ac_save_CXX="$CXX" + CXX="$CXX $switch" + cat confdefs.h - <<_ACEOF >conftest.$ac_ext +/* end confdefs.h. */ + + +// If the compiler admits that it is not ready for C++11, why torture it? +// Hopefully, this will speed up the test. + +#ifndef __cplusplus + +#error "This is not a C++ compiler" + +#elif __cplusplus < 201103L + +#error "This is not a C++11 compiler" + +#else + +namespace cxx11 +{ + + namespace test_static_assert + { + + template + struct check + { + static_assert(sizeof(int) <= sizeof(T), "not big enough"); + }; + + } + + namespace test_final_override + { + + struct Base + { + virtual ~Base() {} + virtual void f() {} + }; + + struct Derived : public Base + { + virtual ~Derived() override {} + virtual void f() override {} + }; + + } + + namespace test_double_right_angle_brackets + { + + template < typename T > + struct check {}; + + typedef check single_type; + typedef check> double_type; + typedef check>> triple_type; + typedef check>>> quadruple_type; + + } + + namespace test_decltype + { + + int + f() + { + int a = 1; + decltype(a) b = 2; + return a + b; + } + + } + + namespace test_type_deduction + { + + template < typename T1, typename T2 > + struct is_same + { + static const bool value = false; + }; + + template < typename T > + struct is_same + { + static const bool value = true; + }; + + template < typename T1, typename T2 > + auto + add(T1 a1, T2 a2) -> decltype(a1 + a2) + { + return a1 + a2; + } + + int + test(const int c, volatile int v) + { + static_assert(is_same::value == true, ""); + static_assert(is_same::value == false, ""); + static_assert(is_same::value == false, ""); + auto ac = c; + auto av = v; + auto sumi = ac + av + 'x'; + auto sumf = ac + av + 1.0; + static_assert(is_same::value == true, ""); + static_assert(is_same::value == true, ""); + static_assert(is_same::value == true, ""); + static_assert(is_same::value == false, ""); + static_assert(is_same::value == true, ""); + return (sumf > 0.0) ? sumi : add(c, v); + } + + } + + namespace test_noexcept + { + + int f() { return 0; } + int g() noexcept { return 0; } + + static_assert(noexcept(f()) == false, ""); + static_assert(noexcept(g()) == true, ""); + + } + + namespace test_constexpr + { + + template < typename CharT > + unsigned long constexpr + strlen_c_r(const CharT *const s, const unsigned long acc) noexcept + { + return *s ? strlen_c_r(s + 1, acc + 1) : acc; + } + + template < typename CharT > + unsigned long constexpr + strlen_c(const CharT *const s) noexcept + { + return strlen_c_r(s, 0UL); + } + + static_assert(strlen_c("") == 0UL, ""); + static_assert(strlen_c("1") == 1UL, ""); + static_assert(strlen_c("example") == 7UL, ""); + static_assert(strlen_c("another\0example") == 7UL, ""); + + } + + namespace test_rvalue_references + { + + template < int N > + struct answer + { + static constexpr int value = N; + }; + + answer<1> f(int&) { return answer<1>(); } + answer<2> f(const int&) { return answer<2>(); } + answer<3> f(int&&) { return answer<3>(); } + + void + test() + { + int i = 0; + const int c = 0; + static_assert(decltype(f(i))::value == 1, ""); + static_assert(decltype(f(c))::value == 2, ""); + static_assert(decltype(f(0))::value == 3, ""); + } + + } + + namespace test_uniform_initialization + { + + struct test + { + static const int zero {}; + static const int one {1}; + }; + + static_assert(test::zero == 0, ""); + static_assert(test::one == 1, ""); + + } + + namespace test_lambdas + { + + void + test1() + { + auto lambda1 = [](){}; + auto lambda2 = lambda1; + lambda1(); + lambda2(); + } + + int + test2() + { + auto a = [](int i, int j){ return i + j; }(1, 2); + auto b = []() -> int { return '0'; }(); + auto c = [=](){ return a + b; }(); + auto d = [&](){ return c; }(); + auto e = [a, &b](int x) mutable { + const auto identity = [](int y){ return y; }; + for (auto i = 0; i < a; ++i) + a += b--; + return x + identity(a + b); + }(0); + return a + b + c + d + e; + } + + int + test3() + { + const auto nullary = [](){ return 0; }; + const auto unary = [](int x){ return x; }; + using nullary_t = decltype(nullary); + using unary_t = decltype(unary); + const auto higher1st = [](nullary_t f){ return f(); }; + const auto higher2nd = [unary](nullary_t f1){ + return [unary, f1](unary_t f2){ return f2(unary(f1())); }; + }; + return higher1st(nullary) + higher2nd(nullary)(unary); + } + + } + + namespace test_variadic_templates + { + + template + struct sum; + + template + struct sum + { + static constexpr auto value = N0 + sum::value; + }; + + template <> + struct sum<> + { + static constexpr auto value = 0; + }; + + static_assert(sum<>::value == 0, ""); + static_assert(sum<1>::value == 1, ""); + static_assert(sum<23>::value == 23, ""); + static_assert(sum<1, 2>::value == 3, ""); + static_assert(sum<5, 5, 11>::value == 21, ""); + static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, ""); + + } + + // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae + // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function + // because of this. + namespace test_template_alias_sfinae + { + + struct foo {}; + + template + using member = typename T::member_type; + + template + void func(...) {} + + template + void func(member*) {} + + void test(); + + void test() { func(0); } + + } + +} // namespace cxx11 + +#endif // __cplusplus >= 201103L + + + +_ACEOF +if ac_fn_cxx_try_compile "$LINENO"; then : + eval $cachevar=yes +else + eval $cachevar=no +fi +rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext + CXX="$ac_save_CXX" +fi +eval ac_res=\$$cachevar + { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5 +$as_echo "$ac_res" >&6; } + if eval test x\$$cachevar = xyes; then + CXX="$CXX $switch" + if test -n "$CXXCPP" ; then + CXXCPP="$CXXCPP $switch" + fi + ac_success=yes + break + fi + done + fi + + if test x$ac_success = xno; then + for alternative in ${ax_cxx_compile_alternatives}; do + for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do + cachevar=`$as_echo "ax_cv_cxx_compile_cxx11_$switch" | $as_tr_sh` + { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features with $switch" >&5 +$as_echo_n "checking whether $CXX supports C++11 features with $switch... " >&6; } +if eval \${$cachevar+:} false; then : + $as_echo_n "(cached) " >&6 +else + ac_save_CXX="$CXX" + CXX="$CXX $switch" + cat confdefs.h - <<_ACEOF >conftest.$ac_ext +/* end confdefs.h. */ + + +// If the compiler admits that it is not ready for C++11, why torture it? +// Hopefully, this will speed up the test. + +#ifndef __cplusplus + +#error "This is not a C++ compiler" + +#elif __cplusplus < 201103L + +#error "This is not a C++11 compiler" + +#else + +namespace cxx11 +{ + + namespace test_static_assert + { + + template + struct check + { + static_assert(sizeof(int) <= sizeof(T), "not big enough"); + }; + + } + + namespace test_final_override + { + + struct Base + { + virtual ~Base() {} + virtual void f() {} + }; + + struct Derived : public Base + { + virtual ~Derived() override {} + virtual void f() override {} + }; + + } + + namespace test_double_right_angle_brackets + { + + template < typename T > + struct check {}; + + typedef check single_type; + typedef check> double_type; + typedef check>> triple_type; + typedef check>>> quadruple_type; + + } + + namespace test_decltype + { + + int + f() + { + int a = 1; + decltype(a) b = 2; + return a + b; + } + + } + + namespace test_type_deduction + { + + template < typename T1, typename T2 > + struct is_same + { + static const bool value = false; + }; + + template < typename T > + struct is_same + { + static const bool value = true; + }; + + template < typename T1, typename T2 > + auto + add(T1 a1, T2 a2) -> decltype(a1 + a2) + { + return a1 + a2; + } + + int + test(const int c, volatile int v) + { + static_assert(is_same::value == true, ""); + static_assert(is_same::value == false, ""); + static_assert(is_same::value == false, ""); + auto ac = c; + auto av = v; + auto sumi = ac + av + 'x'; + auto sumf = ac + av + 1.0; + static_assert(is_same::value == true, ""); + static_assert(is_same::value == true, ""); + static_assert(is_same::value == true, ""); + static_assert(is_same::value == false, ""); + static_assert(is_same::value == true, ""); + return (sumf > 0.0) ? sumi : add(c, v); + } + + } + + namespace test_noexcept + { + + int f() { return 0; } + int g() noexcept { return 0; } + + static_assert(noexcept(f()) == false, ""); + static_assert(noexcept(g()) == true, ""); + + } + + namespace test_constexpr + { + + template < typename CharT > + unsigned long constexpr + strlen_c_r(const CharT *const s, const unsigned long acc) noexcept + { + return *s ? strlen_c_r(s + 1, acc + 1) : acc; + } + + template < typename CharT > + unsigned long constexpr + strlen_c(const CharT *const s) noexcept + { + return strlen_c_r(s, 0UL); + } + + static_assert(strlen_c("") == 0UL, ""); + static_assert(strlen_c("1") == 1UL, ""); + static_assert(strlen_c("example") == 7UL, ""); + static_assert(strlen_c("another\0example") == 7UL, ""); + + } + + namespace test_rvalue_references + { + + template < int N > + struct answer + { + static constexpr int value = N; + }; + + answer<1> f(int&) { return answer<1>(); } + answer<2> f(const int&) { return answer<2>(); } + answer<3> f(int&&) { return answer<3>(); } + + void + test() + { + int i = 0; + const int c = 0; + static_assert(decltype(f(i))::value == 1, ""); + static_assert(decltype(f(c))::value == 2, ""); + static_assert(decltype(f(0))::value == 3, ""); + } + + } + + namespace test_uniform_initialization + { + + struct test + { + static const int zero {}; + static const int one {1}; + }; + + static_assert(test::zero == 0, ""); + static_assert(test::one == 1, ""); + + } + + namespace test_lambdas + { + + void + test1() + { + auto lambda1 = [](){}; + auto lambda2 = lambda1; + lambda1(); + lambda2(); + } + + int + test2() + { + auto a = [](int i, int j){ return i + j; }(1, 2); + auto b = []() -> int { return '0'; }(); + auto c = [=](){ return a + b; }(); + auto d = [&](){ return c; }(); + auto e = [a, &b](int x) mutable { + const auto identity = [](int y){ return y; }; + for (auto i = 0; i < a; ++i) + a += b--; + return x + identity(a + b); + }(0); + return a + b + c + d + e; + } + + int + test3() + { + const auto nullary = [](){ return 0; }; + const auto unary = [](int x){ return x; }; + using nullary_t = decltype(nullary); + using unary_t = decltype(unary); + const auto higher1st = [](nullary_t f){ return f(); }; + const auto higher2nd = [unary](nullary_t f1){ + return [unary, f1](unary_t f2){ return f2(unary(f1())); }; + }; + return higher1st(nullary) + higher2nd(nullary)(unary); + } + + } + + namespace test_variadic_templates + { + + template + struct sum; + + template + struct sum + { + static constexpr auto value = N0 + sum::value; + }; + + template <> + struct sum<> + { + static constexpr auto value = 0; + }; + + static_assert(sum<>::value == 0, ""); + static_assert(sum<1>::value == 1, ""); + static_assert(sum<23>::value == 23, ""); + static_assert(sum<1, 2>::value == 3, ""); + static_assert(sum<5, 5, 11>::value == 21, ""); + static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, ""); + + } + + // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae + // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function + // because of this. + namespace test_template_alias_sfinae + { + + struct foo {}; + + template + using member = typename T::member_type; + + template + void func(...) {} + + template + void func(member*) {} + + void test(); + + void test() { func(0); } + + } + +} // namespace cxx11 + +#endif // __cplusplus >= 201103L + + + +_ACEOF +if ac_fn_cxx_try_compile "$LINENO"; then : + eval $cachevar=yes +else + eval $cachevar=no +fi +rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext + CXX="$ac_save_CXX" +fi +eval ac_res=\$$cachevar + { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5 +$as_echo "$ac_res" >&6; } + if eval test x\$$cachevar = xyes; then + CXX="$CXX $switch" + if test -n "$CXXCPP" ; then + CXXCPP="$CXXCPP $switch" + fi + ac_success=yes + break + fi + done + if test x$ac_success = xyes; then + break + fi + done + fi + ac_ext=c +ac_cpp='$CPP $CPPFLAGS' +ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5' +ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' +ac_compiler_gnu=$ac_cv_c_compiler_gnu + + if test x$ax_cxx_compile_cxx11_required = xtrue; then + if test x$ac_success = xno; then + as_fn_error $? "*** A compiler with support for C++11 language features is required." "$LINENO" 5 + fi + fi + if test x$ac_success = xno; then + HAVE_CXX11=0 + { $as_echo "$as_me:${as_lineno-$LINENO}: No compiler with C++11 support was found" >&5 +$as_echo "$as_me: No compiler with C++11 support was found" >&6;} + else + HAVE_CXX11=1 + +$as_echo "#define HAVE_CXX11 1" >>confdefs.h + + fi + + fi # Used for setting $lt_cv_objdir @@ -6489,7 +7483,8 @@ $as_echo "$as_me: WARNING: GNAT is required to build $language" >&2;} esac # Disable jit if -enable-host-shared not specified - # but not if building for Mingw + # but not if building for Mingw. All code in Windows + # is position independent code (PIC). case $target in *mingw*) ;; *) diff --git a/configure.ac b/configure.ac index 59bd92a3e53..1a53ed418e4 100644 --- a/configure.ac +++ b/configure.ac @@ -23,6 +23,7 @@ m4_include(config/acx.m4) m4_include(config/override.m4) m4_include(config/proginstall.m4) m4_include(config/elf.m4) +m4_include(config/ax_cxx_compile_stdcxx.m4) m4_include([libtool.m4]) m4_include([ltoptions.m4]) m4_include([ltsugar.m4]) @@ -1463,9 +1464,12 @@ case "$have_compiler:$host:$target:$enable_bootstrap" in esac # When bootstrapping with GCC, build stage 1 in C++11 mode to ensure that a -# C++11 compiler can still start the bootstrap. +# C++11 compiler can still start the bootstrap. Otherwise, if building GCC, +# require C++11 (or higher). if test "$enable_bootstrap:$GXX" = "yes:yes"; then CXX="$CXX -std=c++11" +elif test "$have_compiler" = yes; then + AX_CXX_COMPILE_STDCXX(11) fi # Used for setting $lt_cv_objdir diff --git a/gcc/aclocal.m4 b/gcc/aclocal.m4 index e93c1535063..1737d59d1cb 100644 --- a/gcc/aclocal.m4 +++ b/gcc/aclocal.m4 @@ -18,7 +18,6 @@ m4_include([../ltsugar.m4]) m4_include([../ltversion.m4]) m4_include([../lt~obsolete.m4]) m4_include([../config/acx.m4]) -m4_include([../config/ax_cxx_compile_stdcxx.m4]) m4_include([../config/cet.m4]) m4_include([../config/codeset.m4]) m4_include([../config/depstand.m4]) diff --git a/gcc/configure b/gcc/configure index 46850710424..629c7c7e153 100755 --- a/gcc/configure +++ b/gcc/configure @@ -847,7 +847,6 @@ c_loose_warn loose_warn aliasing_flags CPP -HAVE_CXX11 EGREP GREP CXXCPP @@ -5710,998 +5709,6 @@ $as_echo "$ac_cv_safe_to_define___extensions__" >&6; } - ax_cxx_compile_alternatives="11 0x" ax_cxx_compile_cxx11_required=true - ac_ext=cpp -ac_cpp='$CXXCPP $CPPFLAGS' -ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5' -ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' -ac_compiler_gnu=$ac_cv_cxx_compiler_gnu - ac_success=no - - { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features by default" >&5 -$as_echo_n "checking whether $CXX supports C++11 features by default... " >&6; } -if ${ax_cv_cxx_compile_cxx11+:} false; then : - $as_echo_n "(cached) " >&6 -else - cat confdefs.h - <<_ACEOF >conftest.$ac_ext -/* end confdefs.h. */ - - -// If the compiler admits that it is not ready for C++11, why torture it? -// Hopefully, this will speed up the test. - -#ifndef __cplusplus - -#error "This is not a C++ compiler" - -#elif __cplusplus < 201103L - -#error "This is not a C++11 compiler" - -#else - -namespace cxx11 -{ - - namespace test_static_assert - { - - template - struct check - { - static_assert(sizeof(int) <= sizeof(T), "not big enough"); - }; - - } - - namespace test_final_override - { - - struct Base - { - virtual ~Base() {} - virtual void f() {} - }; - - struct Derived : public Base - { - virtual ~Derived() override {} - virtual void f() override {} - }; - - } - - namespace test_double_right_angle_brackets - { - - template < typename T > - struct check {}; - - typedef check single_type; - typedef check> double_type; - typedef check>> triple_type; - typedef check>>> quadruple_type; - - } - - namespace test_decltype - { - - int - f() - { - int a = 1; - decltype(a) b = 2; - return a + b; - } - - } - - namespace test_type_deduction - { - - template < typename T1, typename T2 > - struct is_same - { - static const bool value = false; - }; - - template < typename T > - struct is_same - { - static const bool value = true; - }; - - template < typename T1, typename T2 > - auto - add(T1 a1, T2 a2) -> decltype(a1 + a2) - { - return a1 + a2; - } - - int - test(const int c, volatile int v) - { - static_assert(is_same::value == true, ""); - static_assert(is_same::value == false, ""); - static_assert(is_same::value == false, ""); - auto ac = c; - auto av = v; - auto sumi = ac + av + 'x'; - auto sumf = ac + av + 1.0; - static_assert(is_same::value == true, ""); - static_assert(is_same::value == true, ""); - static_assert(is_same::value == true, ""); - static_assert(is_same::value == false, ""); - static_assert(is_same::value == true, ""); - return (sumf > 0.0) ? sumi : add(c, v); - } - - } - - namespace test_noexcept - { - - int f() { return 0; } - int g() noexcept { return 0; } - - static_assert(noexcept(f()) == false, ""); - static_assert(noexcept(g()) == true, ""); - - } - - namespace test_constexpr - { - - template < typename CharT > - unsigned long constexpr - strlen_c_r(const CharT *const s, const unsigned long acc) noexcept - { - return *s ? strlen_c_r(s + 1, acc + 1) : acc; - } - - template < typename CharT > - unsigned long constexpr - strlen_c(const CharT *const s) noexcept - { - return strlen_c_r(s, 0UL); - } - - static_assert(strlen_c("") == 0UL, ""); - static_assert(strlen_c("1") == 1UL, ""); - static_assert(strlen_c("example") == 7UL, ""); - static_assert(strlen_c("another\0example") == 7UL, ""); - - } - - namespace test_rvalue_references - { - - template < int N > - struct answer - { - static constexpr int value = N; - }; - - answer<1> f(int&) { return answer<1>(); } - answer<2> f(const int&) { return answer<2>(); } - answer<3> f(int&&) { return answer<3>(); } - - void - test() - { - int i = 0; - const int c = 0; - static_assert(decltype(f(i))::value == 1, ""); - static_assert(decltype(f(c))::value == 2, ""); - static_assert(decltype(f(0))::value == 3, ""); - } - - } - - namespace test_uniform_initialization - { - - struct test - { - static const int zero {}; - static const int one {1}; - }; - - static_assert(test::zero == 0, ""); - static_assert(test::one == 1, ""); - - } - - namespace test_lambdas - { - - void - test1() - { - auto lambda1 = [](){}; - auto lambda2 = lambda1; - lambda1(); - lambda2(); - } - - int - test2() - { - auto a = [](int i, int j){ return i + j; }(1, 2); - auto b = []() -> int { return '0'; }(); - auto c = [=](){ return a + b; }(); - auto d = [&](){ return c; }(); - auto e = [a, &b](int x) mutable { - const auto identity = [](int y){ return y; }; - for (auto i = 0; i < a; ++i) - a += b--; - return x + identity(a + b); - }(0); - return a + b + c + d + e; - } - - int - test3() - { - const auto nullary = [](){ return 0; }; - const auto unary = [](int x){ return x; }; - using nullary_t = decltype(nullary); - using unary_t = decltype(unary); - const auto higher1st = [](nullary_t f){ return f(); }; - const auto higher2nd = [unary](nullary_t f1){ - return [unary, f1](unary_t f2){ return f2(unary(f1())); }; - }; - return higher1st(nullary) + higher2nd(nullary)(unary); - } - - } - - namespace test_variadic_templates - { - - template - struct sum; - - template - struct sum - { - static constexpr auto value = N0 + sum::value; - }; - - template <> - struct sum<> - { - static constexpr auto value = 0; - }; - - static_assert(sum<>::value == 0, ""); - static_assert(sum<1>::value == 1, ""); - static_assert(sum<23>::value == 23, ""); - static_assert(sum<1, 2>::value == 3, ""); - static_assert(sum<5, 5, 11>::value == 21, ""); - static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, ""); - - } - - // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae - // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function - // because of this. - namespace test_template_alias_sfinae - { - - struct foo {}; - - template - using member = typename T::member_type; - - template - void func(...) {} - - template - void func(member*) {} - - void test(); - - void test() { func(0); } - - } - -} // namespace cxx11 - -#endif // __cplusplus >= 201103L - - - -_ACEOF -if ac_fn_cxx_try_compile "$LINENO"; then : - ax_cv_cxx_compile_cxx11=yes -else - ax_cv_cxx_compile_cxx11=no -fi -rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext -fi -{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_cxx_compile_cxx11" >&5 -$as_echo "$ax_cv_cxx_compile_cxx11" >&6; } - if test x$ax_cv_cxx_compile_cxx11 = xyes; then - ac_success=yes - fi - - if test x$ac_success = xno; then - for alternative in ${ax_cxx_compile_alternatives}; do - switch="-std=gnu++${alternative}" - cachevar=`$as_echo "ax_cv_cxx_compile_cxx11_$switch" | $as_tr_sh` - { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features with $switch" >&5 -$as_echo_n "checking whether $CXX supports C++11 features with $switch... " >&6; } -if eval \${$cachevar+:} false; then : - $as_echo_n "(cached) " >&6 -else - ac_save_CXX="$CXX" - CXX="$CXX $switch" - cat confdefs.h - <<_ACEOF >conftest.$ac_ext -/* end confdefs.h. */ - - -// If the compiler admits that it is not ready for C++11, why torture it? -// Hopefully, this will speed up the test. - -#ifndef __cplusplus - -#error "This is not a C++ compiler" - -#elif __cplusplus < 201103L - -#error "This is not a C++11 compiler" - -#else - -namespace cxx11 -{ - - namespace test_static_assert - { - - template - struct check - { - static_assert(sizeof(int) <= sizeof(T), "not big enough"); - }; - - } - - namespace test_final_override - { - - struct Base - { - virtual ~Base() {} - virtual void f() {} - }; - - struct Derived : public Base - { - virtual ~Derived() override {} - virtual void f() override {} - }; - - } - - namespace test_double_right_angle_brackets - { - - template < typename T > - struct check {}; - - typedef check single_type; - typedef check> double_type; - typedef check>> triple_type; - typedef check>>> quadruple_type; - - } - - namespace test_decltype - { - - int - f() - { - int a = 1; - decltype(a) b = 2; - return a + b; - } - - } - - namespace test_type_deduction - { - - template < typename T1, typename T2 > - struct is_same - { - static const bool value = false; - }; - - template < typename T > - struct is_same - { - static const bool value = true; - }; - - template < typename T1, typename T2 > - auto - add(T1 a1, T2 a2) -> decltype(a1 + a2) - { - return a1 + a2; - } - - int - test(const int c, volatile int v) - { - static_assert(is_same::value == true, ""); - static_assert(is_same::value == false, ""); - static_assert(is_same::value == false, ""); - auto ac = c; - auto av = v; - auto sumi = ac + av + 'x'; - auto sumf = ac + av + 1.0; - static_assert(is_same::value == true, ""); - static_assert(is_same::value == true, ""); - static_assert(is_same::value == true, ""); - static_assert(is_same::value == false, ""); - static_assert(is_same::value == true, ""); - return (sumf > 0.0) ? sumi : add(c, v); - } - - } - - namespace test_noexcept - { - - int f() { return 0; } - int g() noexcept { return 0; } - - static_assert(noexcept(f()) == false, ""); - static_assert(noexcept(g()) == true, ""); - - } - - namespace test_constexpr - { - - template < typename CharT > - unsigned long constexpr - strlen_c_r(const CharT *const s, const unsigned long acc) noexcept - { - return *s ? strlen_c_r(s + 1, acc + 1) : acc; - } - - template < typename CharT > - unsigned long constexpr - strlen_c(const CharT *const s) noexcept - { - return strlen_c_r(s, 0UL); - } - - static_assert(strlen_c("") == 0UL, ""); - static_assert(strlen_c("1") == 1UL, ""); - static_assert(strlen_c("example") == 7UL, ""); - static_assert(strlen_c("another\0example") == 7UL, ""); - - } - - namespace test_rvalue_references - { - - template < int N > - struct answer - { - static constexpr int value = N; - }; - - answer<1> f(int&) { return answer<1>(); } - answer<2> f(const int&) { return answer<2>(); } - answer<3> f(int&&) { return answer<3>(); } - - void - test() - { - int i = 0; - const int c = 0; - static_assert(decltype(f(i))::value == 1, ""); - static_assert(decltype(f(c))::value == 2, ""); - static_assert(decltype(f(0))::value == 3, ""); - } - - } - - namespace test_uniform_initialization - { - - struct test - { - static const int zero {}; - static const int one {1}; - }; - - static_assert(test::zero == 0, ""); - static_assert(test::one == 1, ""); - - } - - namespace test_lambdas - { - - void - test1() - { - auto lambda1 = [](){}; - auto lambda2 = lambda1; - lambda1(); - lambda2(); - } - - int - test2() - { - auto a = [](int i, int j){ return i + j; }(1, 2); - auto b = []() -> int { return '0'; }(); - auto c = [=](){ return a + b; }(); - auto d = [&](){ return c; }(); - auto e = [a, &b](int x) mutable { - const auto identity = [](int y){ return y; }; - for (auto i = 0; i < a; ++i) - a += b--; - return x + identity(a + b); - }(0); - return a + b + c + d + e; - } - - int - test3() - { - const auto nullary = [](){ return 0; }; - const auto unary = [](int x){ return x; }; - using nullary_t = decltype(nullary); - using unary_t = decltype(unary); - const auto higher1st = [](nullary_t f){ return f(); }; - const auto higher2nd = [unary](nullary_t f1){ - return [unary, f1](unary_t f2){ return f2(unary(f1())); }; - }; - return higher1st(nullary) + higher2nd(nullary)(unary); - } - - } - - namespace test_variadic_templates - { - - template - struct sum; - - template - struct sum - { - static constexpr auto value = N0 + sum::value; - }; - - template <> - struct sum<> - { - static constexpr auto value = 0; - }; - - static_assert(sum<>::value == 0, ""); - static_assert(sum<1>::value == 1, ""); - static_assert(sum<23>::value == 23, ""); - static_assert(sum<1, 2>::value == 3, ""); - static_assert(sum<5, 5, 11>::value == 21, ""); - static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, ""); - - } - - // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae - // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function - // because of this. - namespace test_template_alias_sfinae - { - - struct foo {}; - - template - using member = typename T::member_type; - - template - void func(...) {} - - template - void func(member*) {} - - void test(); - - void test() { func(0); } - - } - -} // namespace cxx11 - -#endif // __cplusplus >= 201103L - - - -_ACEOF -if ac_fn_cxx_try_compile "$LINENO"; then : - eval $cachevar=yes -else - eval $cachevar=no -fi -rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext - CXX="$ac_save_CXX" -fi -eval ac_res=\$$cachevar - { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5 -$as_echo "$ac_res" >&6; } - if eval test x\$$cachevar = xyes; then - CXX="$CXX $switch" - if test -n "$CXXCPP" ; then - CXXCPP="$CXXCPP $switch" - fi - ac_success=yes - break - fi - done - fi - - if test x$ac_success = xno; then - for alternative in ${ax_cxx_compile_alternatives}; do - for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do - cachevar=`$as_echo "ax_cv_cxx_compile_cxx11_$switch" | $as_tr_sh` - { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features with $switch" >&5 -$as_echo_n "checking whether $CXX supports C++11 features with $switch... " >&6; } -if eval \${$cachevar+:} false; then : - $as_echo_n "(cached) " >&6 -else - ac_save_CXX="$CXX" - CXX="$CXX $switch" - cat confdefs.h - <<_ACEOF >conftest.$ac_ext -/* end confdefs.h. */ - - -// If the compiler admits that it is not ready for C++11, why torture it? -// Hopefully, this will speed up the test. - -#ifndef __cplusplus - -#error "This is not a C++ compiler" - -#elif __cplusplus < 201103L - -#error "This is not a C++11 compiler" - -#else - -namespace cxx11 -{ - - namespace test_static_assert - { - - template - struct check - { - static_assert(sizeof(int) <= sizeof(T), "not big enough"); - }; - - } - - namespace test_final_override - { - - struct Base - { - virtual ~Base() {} - virtual void f() {} - }; - - struct Derived : public Base - { - virtual ~Derived() override {} - virtual void f() override {} - }; - - } - - namespace test_double_right_angle_brackets - { - - template < typename T > - struct check {}; - - typedef check single_type; - typedef check> double_type; - typedef check>> triple_type; - typedef check>>> quadruple_type; - - } - - namespace test_decltype - { - - int - f() - { - int a = 1; - decltype(a) b = 2; - return a + b; - } - - } - - namespace test_type_deduction - { - - template < typename T1, typename T2 > - struct is_same - { - static const bool value = false; - }; - - template < typename T > - struct is_same - { - static const bool value = true; - }; - - template < typename T1, typename T2 > - auto - add(T1 a1, T2 a2) -> decltype(a1 + a2) - { - return a1 + a2; - } - - int - test(const int c, volatile int v) - { - static_assert(is_same::value == true, ""); - static_assert(is_same::value == false, ""); - static_assert(is_same::value == false, ""); - auto ac = c; - auto av = v; - auto sumi = ac + av + 'x'; - auto sumf = ac + av + 1.0; - static_assert(is_same::value == true, ""); - static_assert(is_same::value == true, ""); - static_assert(is_same::value == true, ""); - static_assert(is_same::value == false, ""); - static_assert(is_same::value == true, ""); - return (sumf > 0.0) ? sumi : add(c, v); - } - - } - - namespace test_noexcept - { - - int f() { return 0; } - int g() noexcept { return 0; } - - static_assert(noexcept(f()) == false, ""); - static_assert(noexcept(g()) == true, ""); - - } - - namespace test_constexpr - { - - template < typename CharT > - unsigned long constexpr - strlen_c_r(const CharT *const s, const unsigned long acc) noexcept - { - return *s ? strlen_c_r(s + 1, acc + 1) : acc; - } - - template < typename CharT > - unsigned long constexpr - strlen_c(const CharT *const s) noexcept - { - return strlen_c_r(s, 0UL); - } - - static_assert(strlen_c("") == 0UL, ""); - static_assert(strlen_c("1") == 1UL, ""); - static_assert(strlen_c("example") == 7UL, ""); - static_assert(strlen_c("another\0example") == 7UL, ""); - - } - - namespace test_rvalue_references - { - - template < int N > - struct answer - { - static constexpr int value = N; - }; - - answer<1> f(int&) { return answer<1>(); } - answer<2> f(const int&) { return answer<2>(); } - answer<3> f(int&&) { return answer<3>(); } - - void - test() - { - int i = 0; - const int c = 0; - static_assert(decltype(f(i))::value == 1, ""); - static_assert(decltype(f(c))::value == 2, ""); - static_assert(decltype(f(0))::value == 3, ""); - } - - } - - namespace test_uniform_initialization - { - - struct test - { - static const int zero {}; - static const int one {1}; - }; - - static_assert(test::zero == 0, ""); - static_assert(test::one == 1, ""); - - } - - namespace test_lambdas - { - - void - test1() - { - auto lambda1 = [](){}; - auto lambda2 = lambda1; - lambda1(); - lambda2(); - } - - int - test2() - { - auto a = [](int i, int j){ return i + j; }(1, 2); - auto b = []() -> int { return '0'; }(); - auto c = [=](){ return a + b; }(); - auto d = [&](){ return c; }(); - auto e = [a, &b](int x) mutable { - const auto identity = [](int y){ return y; }; - for (auto i = 0; i < a; ++i) - a += b--; - return x + identity(a + b); - }(0); - return a + b + c + d + e; - } - - int - test3() - { - const auto nullary = [](){ return 0; }; - const auto unary = [](int x){ return x; }; - using nullary_t = decltype(nullary); - using unary_t = decltype(unary); - const auto higher1st = [](nullary_t f){ return f(); }; - const auto higher2nd = [unary](nullary_t f1){ - return [unary, f1](unary_t f2){ return f2(unary(f1())); }; - }; - return higher1st(nullary) + higher2nd(nullary)(unary); - } - - } - - namespace test_variadic_templates - { - - template - struct sum; - - template - struct sum - { - static constexpr auto value = N0 + sum::value; - }; - - template <> - struct sum<> - { - static constexpr auto value = 0; - }; - - static_assert(sum<>::value == 0, ""); - static_assert(sum<1>::value == 1, ""); - static_assert(sum<23>::value == 23, ""); - static_assert(sum<1, 2>::value == 3, ""); - static_assert(sum<5, 5, 11>::value == 21, ""); - static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, ""); - - } - - // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae - // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function - // because of this. - namespace test_template_alias_sfinae - { - - struct foo {}; - - template - using member = typename T::member_type; - - template - void func(...) {} - - template - void func(member*) {} - - void test(); - - void test() { func(0); } - - } - -} // namespace cxx11 - -#endif // __cplusplus >= 201103L - - - -_ACEOF -if ac_fn_cxx_try_compile "$LINENO"; then : - eval $cachevar=yes -else - eval $cachevar=no -fi -rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext - CXX="$ac_save_CXX" -fi -eval ac_res=\$$cachevar - { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5 -$as_echo "$ac_res" >&6; } - if eval test x\$$cachevar = xyes; then - CXX="$CXX $switch" - if test -n "$CXXCPP" ; then - CXXCPP="$CXXCPP $switch" - fi - ac_success=yes - break - fi - done - if test x$ac_success = xyes; then - break - fi - done - fi - ac_ext=cpp -ac_cpp='$CXXCPP $CPPFLAGS' -ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5' -ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' -ac_compiler_gnu=$ac_cv_cxx_compiler_gnu - - if test x$ax_cxx_compile_cxx11_required = xtrue; then - if test x$ac_success = xno; then - as_fn_error $? "*** A compiler with support for C++11 language features is required." "$LINENO" 5 - fi - fi - if test x$ac_success = xno; then - HAVE_CXX11=0 - { $as_echo "$as_me:${as_lineno-$LINENO}: No compiler with C++11 support was found" >&5 -$as_echo "$as_me: No compiler with C++11 support was found" >&6;} - else - HAVE_CXX11=1 - -$as_echo "#define HAVE_CXX11 1" >>confdefs.h - - fi - - - ac_ext=c ac_cpp='$CPP $CPPFLAGS' ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5' @@ -20012,7 +19019,7 @@ else lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2 lt_status=$lt_dlunknown cat > conftest.$ac_ext <<_LT_EOF -#line 20015 "configure" +#line 19022 "configure" #include "confdefs.h" #if HAVE_DLFCN_H @@ -20118,7 +19125,7 @@ else lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2 lt_status=$lt_dlunknown cat > conftest.$ac_ext <<_LT_EOF -#line 20121 "configure" +#line 19128 "configure" #include "confdefs.h" #if HAVE_DLFCN_H diff --git a/gcc/configure.ac b/gcc/configure.ac index 60d83c30771..9e7efd13ecc 100644 --- a/gcc/configure.ac +++ b/gcc/configure.ac @@ -386,8 +386,6 @@ AC_SUBST(PICFLAG_FOR_TARGET) AC_USE_SYSTEM_EXTENSIONS -AX_CXX_COMPILE_STDCXX(11) - AC_PROG_CPP AC_C_INLINE