1 2# Reference: http://gcc.gnu.org/projects/cxx0x.html 3# http://gcc.gnu.org/projects/cxx1y.html 4 5set(_cmake_oldestSupported "(__GNUC__ * 100 + __GNUC_MINOR__) >= 404") 6 7set(GNU50_CXX14 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 500 && __cplusplus >= 201402L") 8set(_cmake_feature_test_cxx_variable_templates "${GNU50_CXX14}") 9set(_cmake_feature_test_cxx_relaxed_constexpr "${GNU50_CXX14}") 10set(_cmake_feature_test_cxx_aggregate_default_initializers "${GNU50_CXX14}") 11 12# GNU 4.9 in c++14 mode sets __cplusplus to 201300L, so don't test for the 13# correct value of it below. 14# https://patchwork.ozlabs.org/patch/382470/ 15set(GNU49_CXX14 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 409 && __cplusplus > 201103L") 16set(_cmake_feature_test_cxx_contextual_conversions "${GNU49_CXX14}") 17set(_cmake_feature_test_cxx_attribute_deprecated "${GNU49_CXX14}") 18set(_cmake_feature_test_cxx_decltype_auto "${GNU49_CXX14}") 19set(_cmake_feature_test_cxx_digit_separators "${GNU49_CXX14}") 20set(_cmake_feature_test_cxx_generic_lambdas "${GNU49_CXX14}") 21# GNU 4.3 supports binary literals as an extension, but may warn about 22# use of extensions prior to GNU 4.9 23# http://stackoverflow.com/questions/16334024/difference-between-gcc-binary-literals-and-c14-ones 24set(_cmake_feature_test_cxx_binary_literals "${GNU49_CXX14}") 25# The features below are documented as available in GNU 4.8 (by implementing an 26# earlier draft of the standard paper), but that version of the compiler 27# does not set __cplusplus to a value greater than 201103L until GNU 4.9: 28# http://gcc.gnu.org/onlinedocs/gcc-4.8.2/cpp/Standard-Predefined-Macros.html#Standard-Predefined-Macros 29# http://gcc.gnu.org/onlinedocs/gcc-4.9.0/cpp/Standard-Predefined-Macros.html#Standard-Predefined-Macros 30# So, CMake only reports availability for it with GNU 4.9 or later. 31set(_cmake_feature_test_cxx_return_type_deduction "${GNU49_CXX14}") 32set(_cmake_feature_test_cxx_lambda_init_captures "${GNU49_CXX14}") 33 34# Introduced in GCC 4.8.1 35set(GNU481_CXX11 "((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= 40801) && __cplusplus >= 201103L") 36set(_cmake_feature_test_cxx_decltype_incomplete_return_types "${GNU481_CXX11}") 37set(_cmake_feature_test_cxx_reference_qualified_functions "${GNU481_CXX11}") 38set(GNU48_CXX11 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 408 && __cplusplus >= 201103L") 39set(_cmake_feature_test_cxx_alignas "${GNU48_CXX11}") 40# The alignof feature works with GNU 4.7 and -std=c++11, but it is documented 41# as available with GNU 4.8, so treat that as true. 42set(_cmake_feature_test_cxx_alignof "${GNU48_CXX11}") 43set(_cmake_feature_test_cxx_attributes "${GNU48_CXX11}") 44set(_cmake_feature_test_cxx_inheriting_constructors "${GNU48_CXX11}") 45set(_cmake_feature_test_cxx_thread_local "${GNU48_CXX11}") 46set(GNU47_CXX11 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 407 && __cplusplus >= 201103L") 47set(_cmake_feature_test_cxx_alias_templates "${GNU47_CXX11}") 48set(_cmake_feature_test_cxx_delegating_constructors "${GNU47_CXX11}") 49set(_cmake_feature_test_cxx_extended_friend_declarations "${GNU47_CXX11}") 50set(_cmake_feature_test_cxx_final "${GNU47_CXX11}") 51set(_cmake_feature_test_cxx_nonstatic_member_init "${GNU47_CXX11}") 52set(_cmake_feature_test_cxx_override "${GNU47_CXX11}") 53set(_cmake_feature_test_cxx_user_literals "${GNU47_CXX11}") 54# NOTE: C++11 was ratified in September 2011. GNU 4.7 is the first minor 55# release following that (March 2012), and the first minor release to 56# support -std=c++11. Prior to that, support for C++11 features is technically 57# experiemental and possibly incomplete (see for example the note below about 58# cxx_variadic_template_template_parameters) 59# GNU does not define __cplusplus correctly before version 4.7. 60# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=1773 61# __GXX_EXPERIMENTAL_CXX0X__ is defined in prior versions, but may not be 62# defined in the future. 63set(GNU_CXX0X_DEFINED "(__cplusplus >= 201103L || (defined(__GXX_EXPERIMENTAL_CXX0X__) && __GXX_EXPERIMENTAL_CXX0X__))") 64set(GNU46_CXX11 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 406 && ${GNU_CXX0X_DEFINED}") 65set(_cmake_feature_test_cxx_constexpr "${GNU46_CXX11}") 66set(_cmake_feature_test_cxx_defaulted_move_initializers "${GNU46_CXX11}") 67set(_cmake_feature_test_cxx_enum_forward_declarations "${GNU46_CXX11}") 68set(_cmake_feature_test_cxx_noexcept "${GNU46_CXX11}") 69set(_cmake_feature_test_cxx_nullptr "${GNU46_CXX11}") 70set(_cmake_feature_test_cxx_range_for "${GNU46_CXX11}") 71set(_cmake_feature_test_cxx_unrestricted_unions "${GNU46_CXX11}") 72set(GNU45_CXX11 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 405 && ${GNU_CXX0X_DEFINED}") 73set(_cmake_feature_test_cxx_explicit_conversions "${GNU45_CXX11}") 74set(_cmake_feature_test_cxx_lambdas "${GNU45_CXX11}") 75set(_cmake_feature_test_cxx_local_type_template_args "${GNU45_CXX11}") 76set(_cmake_feature_test_cxx_raw_string_literals "${GNU45_CXX11}") 77set(GNU44_CXX11 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 404 && ${GNU_CXX0X_DEFINED}") 78set(_cmake_feature_test_cxx_auto_type "${GNU44_CXX11}") 79set(_cmake_feature_test_cxx_defaulted_functions "${GNU44_CXX11}") 80set(_cmake_feature_test_cxx_deleted_functions "${GNU44_CXX11}") 81set(_cmake_feature_test_cxx_generalized_initializers "${GNU44_CXX11}") 82set(_cmake_feature_test_cxx_inline_namespaces "${GNU44_CXX11}") 83set(_cmake_feature_test_cxx_sizeof_member "${GNU44_CXX11}") 84set(_cmake_feature_test_cxx_strong_enums "${GNU44_CXX11}") 85set(_cmake_feature_test_cxx_trailing_return_types "${GNU44_CXX11}") 86set(_cmake_feature_test_cxx_unicode_literals "${GNU44_CXX11}") 87set(_cmake_feature_test_cxx_uniform_initialization "${GNU44_CXX11}") 88set(_cmake_feature_test_cxx_variadic_templates "${GNU44_CXX11}") 89# TODO: If features are ever recorded for GNU 4.3, there should possibly 90# be a new feature added like cxx_variadic_template_template_parameters, 91# which is implemented by GNU 4.4, but not 4.3. cxx_variadic_templates is 92# actually implemented by GNU 4.3, but variadic template template parameters 93# 'completes' it, so that is the version we record as having the variadic 94# templates capability in CMake. See 95# http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2555.pdf 96# TODO: Should be supported by GNU 4.3 97set(GNU43_CXX11 "${_cmake_oldestSupported} && ${GNU_CXX0X_DEFINED}") 98set(_cmake_feature_test_cxx_decltype "${GNU43_CXX11}") 99set(_cmake_feature_test_cxx_default_function_template_args "${GNU43_CXX11}") 100set(_cmake_feature_test_cxx_long_long_type "${GNU43_CXX11}") 101set(_cmake_feature_test_cxx_right_angle_brackets "${GNU43_CXX11}") 102set(_cmake_feature_test_cxx_rvalue_references "${GNU43_CXX11}") 103set(_cmake_feature_test_cxx_static_assert "${GNU43_CXX11}") 104# TODO: Should be supported since GNU 3.4? 105set(_cmake_feature_test_cxx_extern_templates "${_cmake_oldestSupported} && ${GNU_CXX0X_DEFINED}") 106# TODO: Should be supported forever? 107set(_cmake_feature_test_cxx_func_identifier "${_cmake_oldestSupported} && ${GNU_CXX0X_DEFINED}") 108set(_cmake_feature_test_cxx_variadic_macros "${_cmake_oldestSupported} && ${GNU_CXX0X_DEFINED}") 109set(_cmake_feature_test_cxx_template_template_parameters "${_cmake_oldestSupported} && __cplusplus") 110