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Update ax_cv_cxx_compile_cxx.m4
This file provides the AX_CXX_COMPILE_STDCXX macro. In the context of the following patch, I wanted to build and test GDB in c++17 mode. The version of the macro we have in the repo does not support detecting c++17 compilers, but the upstream version has been updated to do so. Since we have local modifications to the file, I had to reconcile our modifications and the updated upstream version (which was relatively straightforward). gdb/ChangeLog: * ax_cxx_compile_stdcxx.m4: Sync with upstream. * configure: Re-generate.
This commit is contained in:
Simon Marchi
Simon Marchi
parent
c4a614e239
commit
41260ac25d
@ -1,3 +1,8 @@
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2018-04-09 Simon Marchi <simon.marchi@polymtl.ca>
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* ax_cxx_compile_stdcxx.m4: Sync with upstream.
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* configure: Re-generate.
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2018-04-09 Pedro Alves <palves@redhat.com>
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* gdbarch.sh: Include "observable.h" instead of "observer.h".
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@ -8,7 +8,7 @@
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# - AC_SUBST CXX_DIALECT instead of changing CXX/CXXCPP.
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#
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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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@ -42,21 +42,22 @@
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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 4
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#serial 8
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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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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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@ -80,7 +81,8 @@ 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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@ -103,19 +105,24 @@ 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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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_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 $cachevar=no])
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CXX="$ac_save_CXX"])
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if eval test x\$$cachevar = xyes; then
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CXX_DIALECT="$switch"
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ac_success=yes
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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_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 $cachevar=no])
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CXX="$ac_save_CXX"])
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if eval test x\$$cachevar = xyes; then
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CXX_DIALECT="$switch"
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ac_success=yes
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break
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fi
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done
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if test x$ac_success = xyes; then
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break
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fi
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done
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@ -153,6 +160,11 @@ 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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@ -523,7 +535,7 @@ 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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@ -565,3 +577,409 @@ 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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}
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#endif // !defined(REALLY_CLANG)
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|
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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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|
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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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|
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void g1() noexcept;
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void g2();
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|
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template<typename T>
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Bad
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f(T*, T*);
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|
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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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|
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static_assert (std::is_same_v<Good, decltype(f(g1, g2))>);
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|
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}
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#endif // !defined(REALLY_CLANG)
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|
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namespace test_inline_variables
|
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{
|
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|
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template<class T> void f(T)
|
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{}
|
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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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|
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template<> inline void f<>(int)
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{}
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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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}
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|
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} // namespace cxx17
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|
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#endif // __cplusplus <= 201402L
|
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|
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]])
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|
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28
gdb/configure
vendored
28
gdb/configure
vendored
@ -4967,7 +4967,7 @@ program_transform_name=`$as_echo "$program_transform_name" | sed "$ac_script"`
|
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# We require a C++11 compiler. Check if one is available, and if
|
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# necessary, set CXX_DIALECT to some -std=xxx switch.
|
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|
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ax_cxx_compile_cxx11_required=true
|
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ax_cxx_compile_alternatives="11 0x" ax_cxx_compile_cxx11_required=true
|
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ac_ext=cpp
|
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ac_cpp='$CXXCPP $CPPFLAGS'
|
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ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
|
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@ -5283,7 +5283,8 @@ $as_echo "$ax_cv_cxx_compile_cxx11" >&6; }
|
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fi
|
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|
||||
if test x$ac_success = xno; then
|
||||
for switch in -std=gnu++11 -std=gnu++0x; do
|
||||
for alternative in ${ax_cxx_compile_alternatives}; do
|
||||
switch="-std=gnu++${alternative}"
|
||||
cachevar=`$as_echo "ax_cv_cxx_compile_cxx11_$switch" | $as_tr_sh`
|
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features with $switch" >&5
|
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$as_echo_n "checking whether $CXX supports C++11 features with $switch... " >&6; }
|
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@ -5601,16 +5602,17 @@ $as_echo "$ac_res" >&6; }
|
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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
|
||||
for alternative in ${ax_cxx_compile_alternatives}; do
|
||||
for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; 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 $switch... " >&6; }
|
||||
if { as_var=$cachevar; eval "test \"\${$as_var+set}\" = set"; }; then :
|
||||
$as_echo_n "(cached) " >&6
|
||||
else
|
||||
ac_save_CXX="$CXX"
|
||||
CXX="$CXX $switch"
|
||||
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
|
||||
CXX="$CXX $switch"
|
||||
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
|
||||
/* end confdefs.h. */
|
||||
|
||||
|
||||
@ -5905,14 +5907,18 @@ else
|
||||
eval $cachevar=no
|
||||
fi
|
||||
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
|
||||
CXX="$ac_save_CXX"
|
||||
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_DIALECT="$switch"
|
||||
ac_success=yes
|
||||
if eval test x\$$cachevar = xyes; then
|
||||
CXX_DIALECT="$switch"
|
||||
ac_success=yes
|
||||
break
|
||||
fi
|
||||
done
|
||||
if test x$ac_success = xyes; then
|
||||
break
|
||||
fi
|
||||
done
|
||||
|
||||
Loading…
Reference in New Issue
Block a user