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require a C++20 compatible compiler
This commit is contained in:
Moritz Bunkus
parent
bb6aa513a2
commit
381af2d089
2
NEWS.md
2
NEWS.md
@ -26,6 +26,8 @@
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* Release v8.0.0 of the `fmt` library is now required. If not found, the
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bundled copy will be used.
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* A C++20 compatible compiler is now required for several but certainly not
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all C++20 features. g++ v10 & clang++ v10 should suffice.
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# Version 83.0 "Circle Of Friends" 2024-03-10
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@ -81,15 +81,16 @@ In order to compile MKVToolNix, you need a couple of libraries. Most of
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them should be available pre-compiled for your distribution. The
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programs and libraries you absolutely need are:
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- A C++ compiler that supports several features of the C++11, C++14
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and C++17 standards: initializer lists, range-based `for` loops,
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- A C++ compiler that supports several features of the C++11, C++14,
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C++17 & C++20 standards: initializer lists, range-based `for` loops,
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right angle brackets, the `auto` keyword, lambda functions, the
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`nullptr` keyword, tuples, alias declarations, `std::make_unique()`,
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digit separators, binary literals, generic lambdas, user-defined
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literals for `std::string`, `[[maybe_unused]]` attribute, nested
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namespace definition, structured bindings, `std::optional`,
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`std::regex`. Others may be needed, too. For GCC this means at least
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v8; for clang v7 or later.
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designated initializers, concepts, three-way comparison
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operators. Others may be needed, too. For GCC this means at least
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v10; for clang v10 or later.
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- [libOgg](http://downloads.xiph.org/releases/ogg/) and
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[libVorbis](http://downloads.xiph.org/releases/vorbis/) for access to Ogg/OGM
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@ -1,10 +1,10 @@
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AC_DEFUN([AX_CXX_STD_CXX_FLAG],[
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AC_CACHE_CHECK([for support for the "-std=c++20" or "-std=c++17" flag], [ax_cv_std_cxx_flag],[
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AC_CACHE_CHECK([for support for the "-std=c++20" flag], [ax_cv_std_cxx_flag],[
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AC_LANG_PUSH(C++)
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CXXFLAGS_SAVED="$CXXFLAGS"
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for flag in c++20 c++17; do
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for flag in c++20; do
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CXXFLAGS="$CXXFLAGS_SAVED -std=$flag"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[true;]])],[ax_cv_std_cxx_flag="-std=$flag"],[ax_cv_std_cxx_flag="undecided"])
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@ -24,158 +24,13 @@ AC_DEFUN([AX_CXX_STD_CXX_FLAG],[
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STD_CXX=""
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if test x"$ax_cv_std_cxx_flag" != xno ; then
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STD_CXX=$ax_cv_std_cxx_flag
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else
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AC_MSG_ERROR([compiler does not support the -std=c++20 flag])
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fi
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AC_SUBST(STD_CXX)
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])
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AC_DEFUN([AX_CXX17_ATTRIBUTE_MAYBE_UNUSED],[
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AC_CACHE_CHECK([for support for C++17 feature "attribute 'maybe_unused'"], [ax_cv_cxx17_attribute_maybe_unused],[
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CXXFLAGS_SAVED=$CXXFLAGS
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CXXFLAGS="$CXXFLAGS $STD_CXX"
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export CXXFLAGS
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AC_LANG_PUSH(C++)
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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int testme([[maybe_unused]] int the_var) {
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return 42;
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}
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]], [[return testme(54);]])],
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[ax_cv_cxx17_attribute_maybe_unused="yes"],
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[ax_cv_cxx17_attribute_maybe_unused="no"])
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AC_LANG_POP
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CXXFLAGS="$CXXFLAGS_SAVED"
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])
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if ! test x"$ax_cv_cxx17_attribute_maybe_unused" = xyes ; then
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missing_cxx_features="$missing_cxx_features\n * attribute 'maybe_unused' (C++17)"
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fi
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])
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AC_DEFUN([AX_CXX17_STRUCTURED_BINDINGS],[
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AC_CACHE_CHECK([for support for C++17 feature "structured bindings"], [ax_cv_cxx17_structured_bindings],[
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CXXFLAGS_SAVED=$CXXFLAGS
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CXXFLAGS="$CXXFLAGS $STD_CXX"
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export CXXFLAGS
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AC_LANG_PUSH(C++)
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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#include <utility>
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std::pair<int, char> testme() {
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return std::make_pair(42, '!');
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}
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]], [[
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auto const &[the_int, the_char] = testme();
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return the_int;
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]])],
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[ax_cv_cxx17_structured_bindings="yes"],
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[ax_cv_cxx17_structured_bindings="no"])
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AC_LANG_POP
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CXXFLAGS="$CXXFLAGS_SAVED"
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])
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if ! test x"$ax_cv_cxx17_structured_bindings" = xyes ; then
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missing_cxx_features="$missing_cxx_features\n * structured bindings (C++17)"
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fi
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])
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AC_DEFUN([AX_CXX17_NESTED_NAMESPACE_DEFINITION],[
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AC_CACHE_CHECK([for support for C++17 feature "nested namespace definition"], [ax_cv_cxx17_nested_namespace_definition],[
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CXXFLAGS_SAVED=$CXXFLAGS
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CXXFLAGS="$CXXFLAGS $STD_CXX"
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export CXXFLAGS
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AC_LANG_PUSH(C++)
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[[namespace A::B::C { int d; }]],
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[[A::B::C::d = 1; return A::B::C::d;]])],
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[ax_cv_cxx17_nested_namespace_definition="yes"],
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[ax_cv_cxx17_nested_namespace_definition="no"])
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AC_LANG_POP
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CXXFLAGS="$CXXFLAGS_SAVED"
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])
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if ! test x"$ax_cv_cxx17_nested_namespace_definition" = xyes ; then
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missing_cxx_features="$missing_cxx_features\n * nested namespace definition (C++17)"
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fi
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])
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AC_DEFUN([AX_CXX17_STD_OPTIONAL],[
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AC_CACHE_CHECK([for support for C++17 feature "std::optional"], [ax_cv_cxx17_std_optional],[
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CXXFLAGS_SAVED=$CXXFLAGS
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CXXFLAGS="$CXXFLAGS $STD_CXX"
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export CXXFLAGS
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AC_LANG_PUSH(C++)
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[[#include <optional>]], [[
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std::optional<int> moo;
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moo = 42;
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return moo ? moo.value() : moo.value_or(54);
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]])],
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[ax_cv_cxx17_std_optional="yes"],
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[ax_cv_cxx17_std_optional="no"])
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AC_LANG_POP
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CXXFLAGS="$CXXFLAGS_SAVED"
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])
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if ! test x"$ax_cv_cxx17_std_optional" = xyes ; then
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missing_cxx_features="$missing_cxx_features\n * std::optional (C++17)"
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fi
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])
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AC_DEFUN([AX_CXX17_STD_GCD],[
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AC_CACHE_CHECK([for support for C++17 feature "std::gcd"], [ax_cv_cxx17_std_gcd],[
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CXXFLAGS_SAVED=$CXXFLAGS
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CXXFLAGS="$CXXFLAGS $STD_CXX"
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export CXXFLAGS
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AC_LANG_PUSH(C++)
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[[#include <numeric>]],
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[[return std::gcd(42, 54);]])],
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[ax_cv_cxx17_std_gcd="yes"],
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[ax_cv_cxx17_std_gcd="no"])
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AC_LANG_POP
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CXXFLAGS="$CXXFLAGS_SAVED"
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])
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if ! test x"$ax_cv_cxx17_std_gcd" = xyes ; then
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missing_cxx_features="$missing_cxx_features\n * std::gcd (C++17)"
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fi
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])
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AC_DEFUN([AX_CXX17_CONSTEXPR_IF],[
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AC_CACHE_CHECK([for support for C++17 feature "constexpr if"], [ax_cv_cxx17_constexpr_if],[
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CXXFLAGS_SAVED=$CXXFLAGS
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CXXFLAGS="$CXXFLAGS $STD_CXX"
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export CXXFLAGS
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AC_LANG_PUSH(C++)
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[if constexpr (true) return 42; else return 54;]])],
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[ax_cv_cxx17_constexpr_if="yes"],
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[ax_cv_cxx17_constexpr_if="no"])
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AC_LANG_POP
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CXXFLAGS="$CXXFLAGS_SAVED"
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])
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if ! test x"$ax_cv_cxx17_constexpr_if" = xyes ; then
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missing_cxx_features="$missing_cxx_features\n * constexpr if (C++17)"
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fi
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])
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AC_DEFUN([AX_CXX17_LIBSTDCPPFS],[
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AC_CACHE_CHECK([for libraries to link against for the file system library], [ax_cv_cxx17_libstdcppfs],[
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@ -202,41 +57,5 @@ AC_DEFUN([AX_CXX17_LIBSTDCPPFS],[
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AC_SUBST(STDCPPFS_LIBS)
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])
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dnl AC_DEFUN([AX_CXX17_DEF_NAME],[
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dnl AC_CACHE_CHECK([for support for C++17 feature "human"], [ax_cv_cxx17_def_name],[
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dnl
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dnl CXXFLAGS_SAVED=$CXXFLAGS
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dnl CXXFLAGS="$CXXFLAGS $STD_CXX"
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dnl export CXXFLAGS
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dnl
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dnl AC_LANG_PUSH(C++)
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dnl AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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dnl [[#include <…>]],
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dnl [[code("…");]])],
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dnl [ax_cv_cxx17_def_name="yes"],
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dnl [ax_cv_cxx17_def_name="no"])
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dnl AC_LANG_POP
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dnl
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dnl CXXFLAGS="$CXXFLAGS_SAVED"
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dnl ])
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dnl
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dnl if ! test x"$ax_cv_cxx17_def_name" = xyes ; then
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dnl missing_cxx_features="$missing_cxx_features\n * human (C++17)"
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dnl fi
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dnl ])
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AX_CXX_STD_CXX_FLAG
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AX_CXX17_ATTRIBUTE_MAYBE_UNUSED
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AX_CXX17_NESTED_NAMESPACE_DEFINITION
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AX_CXX17_STRUCTURED_BINDINGS
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AX_CXX17_STD_OPTIONAL
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AX_CXX17_STD_GCD
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AX_CXX17_CONSTEXPR_IF
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AX_CXX17_LIBSTDCPPFS
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if test x"$missing_cxx_features" != x ; then
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printf "The following features of the C++17 standards are not supported by $CXX:$missing_cxx_features\n"
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printf "If you are using the GNU C compiler collection (gcc), you need\n"
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printf "at least v8; for clang v7 and newer should work.\n"
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AC_MSG_ERROR([support for required C++17 features incomplete])
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fi
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