Add support for --with-cxx=17 configure option
Use the latest version of ax_cxx_compile_stdcxx.m4 from the autoconf archive for C++17 support and handle "17" as the option value in our configure. See https://github.com/wxWidgets/wxWidgets/pull/721
This commit is contained in:
Vadim Zeitlin
parent
4be714535d
commit
8881953bea
@ -1,5 +1,5 @@
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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
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# https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
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# ===========================================================================
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#
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# SYNOPSIS
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@ -9,9 +9,9 @@
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# DESCRIPTION
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#
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# Check for baseline language coverage in the compiler for the specified
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# version of the C++ standard. If necessary, add switches to CXXFLAGS to
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# enable support. VERSION may be '11' (for the C++11 standard) or '14'
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# (for the C++14 standard).
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# version of the C++ standard. If necessary, add switches to CXX and
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# CXXCPP to enable support. VERSION may be '11' (for the C++11 standard)
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# or '14' (for the C++14 standard).
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#
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# The second argument, if specified, indicates whether you insist on an
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# extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
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@ -33,21 +33,23 @@
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# Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
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# Copyright (c) 2015 Paul Norman <penorman@mac.com>
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# Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
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# Copyright (c) 2016 Krzesimir Nowak <qdlacz@gmail.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 1
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#serial 7
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dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
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dnl (serial version number 13).
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AX_REQUIRE_DEFINED([AC_MSG_WARN])
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AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
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m4_if([$1], [11], [],
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[$1], [14], [],
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[$1], [17], [m4_fatal([support for C++17 not yet implemented in AX_CXX_COMPILE_STDCXX])],
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m4_if([$1], [11], [ax_cxx_compile_alternatives="11 0x"],
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[$1], [14], [ax_cxx_compile_alternatives="14 1y"],
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[$1], [17], [ax_cxx_compile_alternatives="17 1z"],
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[m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
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m4_if([$2], [], [],
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[$2], [ext], [],
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@ -70,18 +72,22 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
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m4_if([$2], [noext], [], [dnl
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if test x$ac_success = xno; then
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for switch in -std=gnu++$1 -std=gnu++0x; do
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for alternative in ${ax_cxx_compile_alternatives}; do
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switch="-std=gnu++${alternative}"
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cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
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AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
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$cachevar,
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[ac_save_CXXFLAGS="$CXXFLAGS"
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CXXFLAGS="$CXXFLAGS $switch"
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[ac_save_CXX="$CXX"
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CXX="$CXX $switch"
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
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[eval $cachevar=yes],
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[eval $cachevar=no])
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CXXFLAGS="$ac_save_CXXFLAGS"])
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CXX="$ac_save_CXX"])
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if eval test x\$$cachevar = xyes; then
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CXXFLAGS="$CXXFLAGS $switch"
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CXX="$CXX $switch"
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if test -n "$CXXCPP" ; then
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CXXCPP="$CXXCPP $switch"
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fi
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ac_success=yes
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break
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fi
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@ -93,29 +99,37 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
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dnl HP's aCC needs +std=c++11 according to:
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dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
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dnl Cray's crayCC needs "-h std=c++11"
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for switch in -std=c++$1 -std=c++0x +std=c++$1 "-h std=c++$1"; do
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for alternative in ${ax_cxx_compile_alternatives}; do
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for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do
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cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
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AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
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$cachevar,
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[ac_save_CXXFLAGS="$CXXFLAGS"
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CXXFLAGS="$CXXFLAGS $switch"
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[ac_save_CXX="$CXX"
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CXX="$CXX $switch"
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
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[eval $cachevar=yes],
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[eval $cachevar=no])
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CXXFLAGS="$ac_save_CXXFLAGS"])
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CXX="$ac_save_CXX"])
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if eval test x\$$cachevar = xyes; then
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CXXFLAGS="$CXXFLAGS $switch"
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CXX="$CXX $switch"
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if test -n "$CXXCPP" ; then
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CXXCPP="$CXXCPP $switch"
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fi
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ac_success=yes
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break
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fi
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done
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if test x$ac_success = xyes; then
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break
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fi
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done
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fi])
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AC_LANG_POP([C++])
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if test x$ax_cxx_compile_cxx$1_required = xtrue; then
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if test x$ac_success = xno; then
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AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
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fi
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else
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fi
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if test x$ac_success = xno; then
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HAVE_CXX$1=0
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AC_MSG_NOTICE([No compiler with C++$1 support was found])
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@ -124,9 +138,8 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
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AC_DEFINE(HAVE_CXX$1,1,
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[define if the compiler supports basic C++$1 syntax])
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fi
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AC_SUBST(HAVE_CXX$1)
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fi
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m4_if([$1], [17], [AC_MSG_WARN([C++17 is not yet standardized, so the checks may change in incompatible ways anytime])])
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])
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@ -144,6 +157,11 @@ m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
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_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
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)
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m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17],
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_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
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_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
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_AX_CXX_COMPILE_STDCXX_testbody_new_in_17
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)
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dnl Tests for new features in C++11
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@ -514,7 +532,7 @@ namespace cxx14
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}
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namespace test_digit_seperators
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namespace test_digit_separators
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{
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constexpr auto ten_million = 100'000'000;
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@ -556,3 +574,409 @@ namespace cxx14
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#endif // __cplusplus >= 201402L
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]])
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dnl Tests for new features in C++17
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m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_17], [[
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// If the compiler admits that it is not ready for C++17, why torture it?
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// Hopefully, this will speed up the test.
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#ifndef __cplusplus
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#error "This is not a C++ compiler"
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#elif __cplusplus <= 201402L
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#error "This is not a C++17 compiler"
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#else
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#if defined(__clang__)
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#define REALLY_CLANG
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#else
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#if defined(__GNUC__)
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#define REALLY_GCC
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#endif
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#endif
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#include <initializer_list>
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#include <utility>
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#include <type_traits>
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namespace cxx17
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{
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#if !defined(REALLY_CLANG)
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namespace test_constexpr_lambdas
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{
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// TODO: test it with clang++ from git
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constexpr int foo = [](){return 42;}();
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}
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#endif // !defined(REALLY_CLANG)
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namespace test::nested_namespace::definitions
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{
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}
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namespace test_fold_expression
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{
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template<typename... Args>
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int multiply(Args... args)
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{
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return (args * ... * 1);
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}
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template<typename... Args>
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bool all(Args... args)
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{
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return (args && ...);
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}
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}
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namespace test_extended_static_assert
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{
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static_assert (true);
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}
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namespace test_auto_brace_init_list
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{
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auto foo = {5};
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auto bar {5};
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static_assert(std::is_same<std::initializer_list<int>, decltype(foo)>::value);
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static_assert(std::is_same<int, decltype(bar)>::value);
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}
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namespace test_typename_in_template_template_parameter
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{
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template<template<typename> typename X> struct D;
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}
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namespace test_fallthrough_nodiscard_maybe_unused_attributes
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{
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int f1()
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{
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return 42;
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}
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[[nodiscard]] int f2()
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{
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[[maybe_unused]] auto unused = f1();
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switch (f1())
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{
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case 17:
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f1();
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[[fallthrough]];
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case 42:
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f1();
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}
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return f1();
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}
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}
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namespace test_extended_aggregate_initialization
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{
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struct base1
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{
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int b1, b2 = 42;
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};
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struct base2
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{
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base2() {
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b3 = 42;
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}
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int b3;
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};
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struct derived : base1, base2
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{
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int d;
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};
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derived d1 {{1, 2}, {}, 4}; // full initialization
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derived d2 {{}, {}, 4}; // value-initialized bases
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}
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namespace test_general_range_based_for_loop
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{
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struct iter
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{
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int i;
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int& operator* ()
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{
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return i;
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}
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const int& operator* () const
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{
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return i;
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}
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iter& operator++()
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{
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++i;
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return *this;
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}
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};
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struct sentinel
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{
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int i;
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};
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bool operator== (const iter& i, const sentinel& s)
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{
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return i.i == s.i;
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}
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bool operator!= (const iter& i, const sentinel& s)
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{
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return !(i == s);
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}
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struct range
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{
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iter begin() const
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{
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return {0};
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}
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sentinel end() const
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{
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return {5};
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}
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};
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void f()
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{
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range r {};
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for (auto i : r)
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{
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[[maybe_unused]] auto v = i;
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}
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}
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}
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namespace test_lambda_capture_asterisk_this_by_value
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{
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struct t
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{
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int i;
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int foo()
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{
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return [*this]()
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{
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return i;
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}();
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}
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};
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}
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namespace test_enum_class_construction
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{
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enum class byte : unsigned char
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{};
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byte foo {42};
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}
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namespace test_constexpr_if
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{
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template <bool cond>
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int f ()
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{
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if constexpr(cond)
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{
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return 13;
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}
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else
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{
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return 42;
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}
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}
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}
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namespace test_selection_statement_with_initializer
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{
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int f()
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{
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return 13;
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}
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int f2()
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{
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if (auto i = f(); i > 0)
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{
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return 3;
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}
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switch (auto i = f(); i + 4)
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{
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case 17:
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return 2;
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default:
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return 1;
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}
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}
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}
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#if !defined(REALLY_CLANG)
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namespace test_template_argument_deduction_for_class_templates
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{
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// TODO: test it with clang++ from git
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template <typename T1, typename T2>
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struct pair
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{
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pair (T1 p1, T2 p2)
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: m1 {p1},
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m2 {p2}
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{}
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T1 m1;
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T2 m2;
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};
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void f()
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{
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[[maybe_unused]] auto p = pair{13, 42u};
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}
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}
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#endif // !defined(REALLY_CLANG)
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namespace test_non_type_auto_template_parameters
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{
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template <auto n>
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struct B
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{};
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B<5> b1;
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B<'a'> b2;
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}
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#if !defined(REALLY_CLANG)
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namespace test_structured_bindings
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{
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// TODO: test it with clang++ from git
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int arr[2] = { 1, 2 };
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std::pair<int, int> pr = { 1, 2 };
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auto f1() -> int(&)[2]
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{
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return arr;
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}
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auto f2() -> std::pair<int, int>&
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{
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return pr;
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}
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struct S
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{
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int x1 : 2;
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volatile double y1;
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};
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S f3()
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{
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return {};
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}
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auto [ x1, y1 ] = f1();
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auto& [ xr1, yr1 ] = f1();
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auto [ x2, y2 ] = f2();
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auto& [ xr2, yr2 ] = f2();
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const auto [ x3, y3 ] = f3();
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}
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#endif // !defined(REALLY_CLANG)
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#if !defined(REALLY_CLANG)
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namespace test_exception_spec_type_system
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{
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// TODO: test it with clang++ from git
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struct Good {};
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struct Bad {};
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void g1() noexcept;
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void g2();
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template<typename T>
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Bad
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f(T*, T*);
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template<typename T1, typename T2>
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Good
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f(T1*, T2*);
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static_assert (std::is_same_v<Good, decltype(f(g1, g2))>);
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}
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#endif // !defined(REALLY_CLANG)
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namespace test_inline_variables
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{
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template<class T> void f(T)
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{}
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template<class T> inline T g(T)
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{
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return T{};
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}
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template<> inline void f<>(int)
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{}
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template<> int g<>(int)
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{
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return 5;
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}
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}
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} // namespace cxx17
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#endif // __cplusplus <= 201402L
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]])
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10
configure.in
10
configure.in
@ -633,7 +633,7 @@ dnl ---------------------------------------------------------------------------
|
||||
|
||||
WX_ARG_DISABLE(shared, [ --disable-shared create static library instead of shared], wxUSE_SHARED)
|
||||
AC_ARG_ENABLE(cxx11, [ --enable-cxx11 use C++11 compiler if available], [wxWITH_CXX=11 wxWITH_CXX_IS_OPTIONAL=1])
|
||||
AC_ARG_WITH(cxx, [ --with-cxx=11|14 use the given C++11], [wxWITH_CXX="$withval"])
|
||||
AC_ARG_WITH(cxx, [ --with-cxx=11|14|17 use the given C++ dialect], [wxWITH_CXX="$withval"])
|
||||
WX_ARG_ENABLE(stl, [ --enable-stl use standard C++ classes for everything], wxUSE_STL)
|
||||
if test "$wxUSE_STL" = "yes"; then
|
||||
DEFAULT_wxUSE_STD_CONTAINERS=yes
|
||||
@ -1101,8 +1101,14 @@ if test -n "$wxWITH_CXX"; then
|
||||
HAVE_CXX11=1
|
||||
;;
|
||||
|
||||
17)
|
||||
dnl This is similar to 14 above.
|
||||
AX_CXX_COMPILE_STDCXX(17)
|
||||
HAVE_CXX11=1
|
||||
;;
|
||||
|
||||
*)
|
||||
AC_MSG_ERROR([Invalid --with-cxx="$wxWITH_CXX" option value, only 11 or 14 supported])
|
||||
AC_MSG_ERROR([Invalid --with-cxx="$wxWITH_CXX" option value, only 11, 14 or 17 supported])
|
||||
esac
|
||||
|
||||
if test "$HAVE_CXX11" = "1" ; then
|
||||
|
||||
Loading…
Reference in New Issue
Block a user