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AR="$am_aux_dir/ar-lib $AR" ;; unknown) as_fn_error $? "could not determine $AR interface" "$LINENO" 5 ;; esac if test -n "$ac_tool_prefix"; then # Extract the first word of "${ac_tool_prefix}readelf", so it can be a program name with args. set dummy ${ac_tool_prefix}readelf; ac_word=$2 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5 $as_echo_n "checking for $ac_word... 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In particular we need # Mixed Declarations and Code # https://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html # Nested Functions # https://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html # Arrays of Variable Length # https://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html { $as_echo "$as_me:${as_lineno-$LINENO}: checking for gcc with GNU99 support" >&5 $as_echo_n "checking for gcc with GNU99 support... " >&6; } if ${ac_cv_c99+:} false; then : $as_echo_n "(cached) " >&6 else old_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS -std=gnu99" cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ int foo (int a) { for (int i = 0; i < a; ++i) if (i % 4) break; int s = a; return s; } double bar (double a, double b) { double square (double z) { return z * z; } return square (a) + square (b); } void baz (int n) { struct S { int x[n]; }; } _ACEOF if ac_fn_c_try_compile "$LINENO"; then : ac_cv_c99=yes else ac_cv_c99=no fi rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext CFLAGS="$old_CFLAGS" fi { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c99" >&5 $as_echo "$ac_cv_c99" >&6; } if test "x$ac_cv_c99" != xyes; then : as_fn_error $? "gcc with GNU99 support required" "$LINENO" 5 fi { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether gcc supports __attribute__((visibility()))" >&5 $as_echo_n "checking whether gcc supports __attribute__((visibility()))... " >&6; } if ${ac_cv_visibility+:} false; then : $as_echo_n "(cached) " >&6 else save_CFLAGS="$CFLAGS" CFLAGS="$save_CFLAGS -Werror" cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ int __attribute__((visibility("hidden"))) foo (int a) { return a; } _ACEOF if ac_fn_c_try_compile "$LINENO"; then : ac_cv_visibility=yes else ac_cv_visibility=no fi rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext CFLAGS="$save_CFLAGS" fi { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_visibility" >&5 $as_echo "$ac_cv_visibility" >&6; } if test "$ac_cv_visibility" = "yes"; then $as_echo "#define HAVE_VISIBILITY 1" >>confdefs.h fi { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether gcc supports __attribute__((gcc_struct))" >&5 $as_echo_n "checking whether gcc supports __attribute__((gcc_struct))... " >&6; } if ${ac_cv_gcc_struct+:} false; then : $as_echo_n "(cached) " >&6 else save_CFLAGS="$CFLAGS" CFLAGS="$save_CFLAGS -Werror" cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ struct test { int x; } __attribute__((gcc_struct)); _ACEOF if ac_fn_c_try_compile "$LINENO"; then : ac_cv_gcc_struct=yes else ac_cv_gcc_struct=no fi rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext CFLAGS="$save_CFLAGS" fi { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_gcc_struct" >&5 $as_echo "$ac_cv_gcc_struct" >&6; } if test "$ac_cv_gcc_struct" = "yes"; then $as_echo "#define HAVE_GCC_STRUCT 1" >>confdefs.h fi { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether gcc supports -fPIC" >&5 $as_echo_n "checking whether gcc supports -fPIC... 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"unexpected compile failure See \`config.log' for more details" "$LINENO" 5; } fi rm -f core conftest.err conftest.$ac_objext \ conftest$ac_exeext conftest.$ac_ext fi { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_buildid" >&5 $as_echo "$ac_cv_buildid" >&6; } if test "$ac_cv_buildid" = "no"; then { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: compiler doesn't generate build-id by default" >&5 $as_echo "$as_me: WARNING: compiler doesn't generate build-id by default" >&2;} LDFLAGS="$LDFLAGS -Wl,--build-id" fi ZRELRO_LDFLAGS="-Wl,-z,relro" { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether gcc supports $ZRELRO_LDFLAGS" >&5 $as_echo_n "checking whether gcc supports $ZRELRO_LDFLAGS... 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CC_BIARCH="$CC $utrace_biarch" # In maintainer mode we really need flex and bison. # Otherwise we really need a release dir with maintainer files generated. if test "x$enable_maintainer_mode" = xyes; then # Extract the first word of "flex", so it can be a program name with args. set dummy flex; ac_word=$2 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5 $as_echo_n "checking for $ac_word... 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"flex needed in maintainer mode" "$LINENO" 5 fi # Extract the first word of "bison", so it can be a program name with args. set dummy bison; ac_word=$2 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5 $as_echo_n "checking for $ac_word... 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"bison needed in maintainer mode" "$LINENO" 5 fi # Extract the first word of "gawk", so it can be a program name with args. set dummy gawk; ac_word=$2 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5 $as_echo_n "checking for $ac_word... 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"gawk needed in maintainer mode" "$LINENO" 5 fi else if test ! -f ${srcdir}/libdw/known-dwarf.h; then as_fn_error $? "No libdw/known-dwarf.h. configure --enable-maintainer-mode" "$LINENO" 5 fi fi # The testfiles are all compressed, we need bunzip2 when running make check # Extract the first word of "bunzip2", so it can be a program name with args. set dummy bunzip2; ac_word=$2 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5 $as_echo_n "checking for $ac_word... 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"dependencies not found, use --disable-libdebuginfod to disable or --enable-libdebuginfod=dummy to build a (bootstrap) dummy library." 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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 switch in -std=c++11 -std=c++0x +std=c++11 "-h std=c++11"; 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... 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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 $switch" ac_success=yes break fi done fi ac_ext=c ac_cpp='$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 $? 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