Fix C++20/gcc-12 issues (Part 1) (#3379)
* 🔧 use proper GCC binary * 🔧 add more GCC warning flags * ⚗️ try fix from https://github.com/nlohmann/json/issues/3138#issuecomment-1015562666 * Fix custom allocator test build failures (C++20) Allocator tests fail to compile in C++20 mode with clang+MS STL due to missing copy constructors. * Fix test build failures due to missing noexcept (gcc-12) * alt_string has multiple member functions that should be marked noexcept. * nlohmann::ordered_map constructors can be noexcept. Compilation failures result from the warning flag -Werror=noexcept and gcc-12. * Disable broken comparison tests in C++20 mode Co-authored-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Florian Albrechtskirchinger
GitHub
parent
4a6e6ca8c7
commit
f208a9c19b
@ -30,7 +30,7 @@ execute_process(COMMAND ${CPPCHECK_TOOL} --version OUTPUT_VARIABLE CPPCHECK_TOOL
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string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" CPPCHECK_TOOL_VERSION "${CPPCHECK_TOOL_VERSION}")
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message(STATUS "🔖 Cppcheck ${CPPCHECK_TOOL_VERSION} (${CPPCHECK_TOOL})")
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find_program(GCC_TOOL NAMES g++-HEAD g++-11 g++-latest)
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find_program(GCC_TOOL NAMES g++-latest g++-HEAD g++-11)
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execute_process(COMMAND ${GCC_TOOL} --version OUTPUT_VARIABLE GCC_TOOL_VERSION ERROR_VARIABLE GCC_TOOL_VERSION)
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string(REGEX MATCH "[0-9]+(\\.[0-9]+)+" GCC_TOOL_VERSION "${GCC_TOOL_VERSION}")
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message(STATUS "🔖 GCC ${GCC_TOOL_VERSION} (${GCC_TOOL})")
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@ -111,6 +111,7 @@ set(CLANG_CXXFLAGS "-std=c++11 \
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-Wno-reserved-identifier \
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")
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# Warning flags determined for GCC 12.0 (experimental) with https://github.com/nlohmann/gcc_flags:
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# Ignored GCC warnings:
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# -Wno-abi-tag We do not care about ABI tags.
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# -Wno-aggregate-return The library uses aggregate returns.
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@ -150,16 +151,22 @@ set(GCC_CXXFLAGS "-std=c++11 \
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-Wanalyzer-shift-count-negative \
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-Wanalyzer-shift-count-overflow \
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-Wanalyzer-stale-setjmp-buffer \
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-Wanalyzer-tainted-allocation-size \
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-Wanalyzer-tainted-array-index \
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-Wanalyzer-tainted-divisor \
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-Wanalyzer-tainted-offset \
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-Wanalyzer-tainted-size \
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-Wanalyzer-too-complex \
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-Wanalyzer-unsafe-call-within-signal-handler \
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-Wanalyzer-use-after-free \
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-Wanalyzer-use-of-pointer-in-stale-stack-frame \
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-Wanalyzer-use-of-uninitialized-value \
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-Wanalyzer-write-to-const \
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-Wanalyzer-write-to-string-literal \
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-Warith-conversion \
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-Warray-bounds \
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-Warray-bounds=2 \
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-Warray-compare \
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-Warray-parameter=2 \
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-Wattribute-alias=2 \
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-Wattribute-warning \
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@ -170,10 +177,15 @@ set(GCC_CXXFLAGS "-std=c++11 \
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-Wbuiltin-macro-redefined \
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-Wc++0x-compat \
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-Wc++11-compat \
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-Wc++11-extensions \
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-Wc++14-compat \
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-Wc++14-extensions \
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-Wc++17-compat \
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-Wc++17-extensions \
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-Wc++1z-compat \
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-Wc++20-compat \
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-Wc++20-extensions \
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-Wc++23-extensions \
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-Wc++2a-compat \
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-Wcannot-profile \
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-Wcast-align \
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@ -191,6 +203,7 @@ set(GCC_CXXFLAGS "-std=c++11 \
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-Wconditionally-supported \
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-Wconversion \
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-Wconversion-null \
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-Wcoverage-invalid-line-number \
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-Wcoverage-mismatch \
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-Wcpp \
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-Wctad-maybe-unsupported \
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@ -215,21 +228,16 @@ set(GCC_CXXFLAGS "-std=c++11 \
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-Wendif-labels \
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-Wenum-compare \
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-Wenum-conversion \
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-Wexceptions \
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-Wexpansion-to-defined \
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-Wextra \
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-Wextra-semi \
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-Wfloat-conversion \
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-Wfloat-equal \
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-Wformat-contains-nul \
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-Wformat-diag \
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-Wformat-extra-args \
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-Wformat-nonliteral \
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-Wformat-overflow=2 \
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-Wformat-security \
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-Wformat-signedness \
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-Wformat-truncation=2 \
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-Wformat-y2k \
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-Wformat-zero-length \
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-Wformat=2 \
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-Wframe-address \
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-Wfree-nonheap-object \
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@ -239,12 +247,15 @@ set(GCC_CXXFLAGS "-std=c++11 \
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-Wignored-qualifiers \
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-Wimplicit-fallthrough=5 \
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-Winaccessible-base \
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-Winfinite-recursion \
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-Winherited-variadic-ctor \
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-Winit-list-lifetime \
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-Winit-self \
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-Winline \
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-Wint-in-bool-context \
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-Wint-to-pointer-cast \
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-Winterference-size \
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-Winvalid-imported-macros \
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-Winvalid-memory-model \
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-Winvalid-offsetof \
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-Winvalid-pch \
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@ -267,6 +278,7 @@ set(GCC_CXXFLAGS "-std=c++11 \
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-Wmissing-field-initializers \
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-Wmissing-include-dirs \
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-Wmissing-profile \
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-Wmissing-requires \
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-Wmultichar \
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-Wmultiple-inheritance \
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-Wmultistatement-macros \
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@ -282,6 +294,7 @@ set(GCC_CXXFLAGS "-std=c++11 \
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-Wnull-dereference \
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-Wodr \
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-Wold-style-cast \
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-Wopenacc-parallelism \
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-Wopenmp-simd \
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-Woverflow \
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-Woverlength-strings \
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@ -1872,6 +1872,7 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
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template < typename ValueType, typename std::enable_if <
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detail::conjunction <
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detail::negation<std::is_pointer<ValueType>>,
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detail::negation<std::is_same<ValueType, std::nullptr_t>>,
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detail::negation<std::is_same<ValueType, detail::json_ref<basic_json>>>,
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detail::negation<std::is_same<ValueType, typename string_t::value_type>>,
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detail::negation<detail::is_basic_json<ValueType>>,
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@ -30,7 +30,8 @@ template <class Key, class T, class IgnoredLess = std::less<Key>,
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// Explicit constructors instead of `using Container::Container`
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// otherwise older compilers choke on it (GCC <= 5.5, xcode <= 9.4)
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ordered_map(const Allocator& alloc = Allocator()) : Container{alloc} {}
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ordered_map() noexcept(noexcept(Container())) : Container{} {}
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explicit ordered_map(const Allocator& alloc) noexcept(noexcept(Container(alloc))) : Container{alloc} {}
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template <class It>
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ordered_map(It first, It last, const Allocator& alloc = Allocator())
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: Container{first, last, alloc} {}
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@ -17066,7 +17066,8 @@ template <class Key, class T, class IgnoredLess = std::less<Key>,
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// Explicit constructors instead of `using Container::Container`
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// otherwise older compilers choke on it (GCC <= 5.5, xcode <= 9.4)
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ordered_map(const Allocator& alloc = Allocator()) : Container{alloc} {}
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ordered_map() noexcept(noexcept(Container())) : Container{} {}
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explicit ordered_map(const Allocator& alloc) noexcept(noexcept(Container(alloc))) : Container{alloc} {}
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template <class It>
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ordered_map(It first, It last, const Allocator& alloc = Allocator())
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: Container{first, last, alloc} {}
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@ -19052,6 +19053,7 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
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template < typename ValueType, typename std::enable_if <
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detail::conjunction <
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detail::negation<std::is_pointer<ValueType>>,
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detail::negation<std::is_same<ValueType, std::nullptr_t>>,
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detail::negation<std::is_same<ValueType, detail::json_ref<basic_json>>>,
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detail::negation<std::is_same<ValueType, typename string_t::value_type>>,
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detail::negation<detail::is_basic_json<ValueType>>,
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@ -39,6 +39,8 @@ namespace
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template<class T>
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struct bad_allocator : std::allocator<T>
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{
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using std::allocator<T>::allocator;
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template<class... Args>
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void construct(T* /*unused*/, Args&& ... /*unused*/)
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{
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@ -104,12 +104,12 @@ class alt_string
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}
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template <typename op_type>
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bool operator<(const op_type& op) const
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bool operator<(const op_type& op) const noexcept
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{
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return str_impl < op;
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}
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bool operator<(const alt_string& op) const
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bool operator<(const alt_string& op) const noexcept
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{
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return str_impl < op.str_impl;
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}
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@ -32,6 +32,10 @@ SOFTWARE.
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#include <nlohmann/json.hpp>
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using nlohmann::json;
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#if (defined(__cplusplus) && __cplusplus >= 202002L) || (defined(_MSVC_LANG) && _MSVC_LANG >= 202002L)
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#define JSON_HAS_CPP_20
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#endif
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namespace
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{
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// helper function to check std::less<json::value_t>
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@ -205,6 +209,14 @@ TEST_CASE("lexicographical comparison operators")
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{
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for (size_t j = 0; j < j_values.size(); ++j)
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{
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// Skip comparing indicies 12 and 13, and 13 and 12 in C++20 pending fix
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// See issue #3207
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#ifdef JSON_HAS_CPP_20
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if ((i == 12 && j == 13) || (i == 13 && j == 12))
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{
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continue;
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}
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#endif
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CAPTURE(i)
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CAPTURE(j)
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CAPTURE(j_values[i])
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@ -271,7 +271,10 @@ std::string* sax_no_exception::error_string = nullptr;
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template<class T>
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class my_allocator : public std::allocator<T>
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{};
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{
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public:
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using std::allocator<T>::allocator;
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};
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/////////////////////////////////////////////////////////////////////
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// for #3077
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@ -338,7 +341,7 @@ TEST_CASE("regression tests 2")
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]
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})";
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json::parser_callback_t cb = [&](int /*level*/, json::parse_event_t event, json & parsed)
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json::parser_callback_t cb = [&](int /*level*/, json::parse_event_t event, json & parsed) noexcept
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{
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// skip uninteresting events
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if (event == json::parse_event_t::value && !parsed.is_primitive())
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