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acinclude.m4
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dnl
dnl $Source$
dnl $Date$
dnl $Revision$
dnl
dnl DESCRIPTION:
dnl Local macro definitions for Gambit configure.in
dnl
dnl ---------------------------------------------------------------------------
dnl Macros for wxWidgets detection. Typically used in configure.in as:
dnl
dnl AC_ARG_ENABLE(...)
dnl AC_ARG_WITH(...)
dnl ...
dnl AM_OPTIONS_WXCONFIG
dnl ...
dnl ...
dnl AM_PATH_WXCONFIG(2.6.0, wxWin=1)
dnl if test "$wxWin" != 1; then
dnl AC_MSG_ERROR([
dnl wxWidgets must be installed on your system
dnl but wx-config script couldn't be found.
dnl
dnl Please check that wx-config is in path, the directory
dnl where wxWidgets libraries are installed (returned by
dnl 'wx-config --libs' command) is in LD_LIBRARY_PATH or
dnl equivalent variable and wxWidgets version is 2.3.4 or above.
dnl ])
dnl fi
dnl CPPFLAGS="$CPPFLAGS $WX_CPPFLAGS"
dnl CXXFLAGS="$CXXFLAGS $WX_CXXFLAGS_ONLY"
dnl CFLAGS="$CFLAGS $WX_CFLAGS_ONLY"
dnl
dnl LIBS="$LIBS $WX_LIBS"
dnl ---------------------------------------------------------------------------
dnl ---------------------------------------------------------------------------
dnl AM_OPTIONS_WXCONFIG
dnl
dnl adds support for --wx-prefix, --wx-exec-prefix, --with-wxdir and
dnl --wx-config command line options
dnl ---------------------------------------------------------------------------
AC_DEFUN([AM_OPTIONS_WXCONFIG],
[
AC_ARG_WITH(wxdir,
[ --with-wxdir=PATH Use uninstalled version of wxWidgets in PATH],
[ wx_config_name="$withval/wx-config"
wx_config_args="--inplace"])
AC_ARG_WITH(wx-config,
[ --with-wx-config=CONFIG wx-config script to use (optional)],
wx_config_name="$withval" )
AC_ARG_WITH(wx-prefix,
[ --with-wx-prefix=PREFIX Prefix where wxWidgets is installed (optional)],
wx_config_prefix="$withval", wx_config_prefix="")
AC_ARG_WITH(wx-exec-prefix,
[ --with-wx-exec-prefix=PREFIX
Exec prefix where wxWidgets is installed (optional)],
wx_config_exec_prefix="$withval", wx_config_exec_prefix="")
])
dnl Helper macro for checking if wx version is at least $1.$2.$3, set's
dnl wx_ver_ok=yes if it is:
AC_DEFUN([_WX_PRIVATE_CHECK_VERSION],
[
wx_ver_ok=""
if test "x$WX_VERSION" != x ; then
if test $wx_config_major_version -gt $1; then
wx_ver_ok=yes
else
if test $wx_config_major_version -eq $1; then
if test $wx_config_minor_version -gt $2; then
wx_ver_ok=yes
else
if test $wx_config_minor_version -eq $2; then
if test $wx_config_micro_version -ge $3; then
wx_ver_ok=yes
fi
fi
fi
fi
fi
fi
])
dnl ---------------------------------------------------------------------------
dnl AM_PATH_WXCONFIG(VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND
dnl [, WX-LIBS [, ADDITIONAL-WX-CONFIG-FLAGS]]]])
dnl
dnl Test for wxWidgets, and define WX_C*FLAGS, WX_LIBS and WX_LIBS_STATIC
dnl (the latter is for static linking against wxWidgets). Set WX_CONFIG_NAME
dnl environment variable to override the default name of the wx-config script
dnl to use. Set WX_CONFIG_PATH to specify the full path to wx-config - in this
dnl case the macro won't even waste time on tests for its existence.
dnl
dnl Optional WX-LIBS argument contains comma- or space-separated list of
dnl wxWidgets libraries to link against (it may include contrib libraries). If
dnl it is not specified then WX_LIBS and WX_LIBS_STATIC will contain flags to
dnl link with all of the core wxWidgets libraries.
dnl
dnl Optional ADDITIONAL-WX-CONFIG-FLAGS argument is appended to wx-config
dnl invocation command in present. It can be used to fine-tune lookup of
dnl best wxWidgets build available.
dnl
dnl Example use:
dnl AM_PATH_WXCONFIG([2.6.0], [wxWin=1], [wxWin=0], [html,core,net]
dnl [--unicode --debug])
dnl ---------------------------------------------------------------------------
dnl
dnl Get the cflags and libraries from the wx-config script
dnl
AC_DEFUN([AM_PATH_WXCONFIG],
[
dnl do we have wx-config name: it can be wx-config or wxd-config or ...
if test x${WX_CONFIG_NAME+set} != xset ; then
WX_CONFIG_NAME=wx-config
fi
if test "x$wx_config_name" != x ; then
WX_CONFIG_NAME="$wx_config_name"
fi
dnl deal with optional prefixes
if test x$wx_config_exec_prefix != x ; then
wx_config_args="$wx_config_args --exec-prefix=$wx_config_exec_prefix"
WX_LOOKUP_PATH="$wx_config_exec_prefix/bin"
fi
if test x$wx_config_prefix != x ; then
wx_config_args="$wx_config_args --prefix=$wx_config_prefix"
WX_LOOKUP_PATH="$WX_LOOKUP_PATH:$wx_config_prefix/bin"
fi
if test "$cross_compiling" = "yes"; then
wx_config_args="$wx_config_args --host=$host_alias"
fi
dnl don't search the PATH if WX_CONFIG_NAME is absolute filename
if test -x "$WX_CONFIG_NAME" ; then
AC_MSG_CHECKING(for wx-config)
WX_CONFIG_PATH="$WX_CONFIG_NAME"
AC_MSG_RESULT($WX_CONFIG_PATH)
else
AC_PATH_PROG(WX_CONFIG_PATH, $WX_CONFIG_NAME, no, "$WX_LOOKUP_PATH:$PATH")
fi
if test "$WX_CONFIG_PATH" != "no" ; then
WX_VERSION=""
min_wx_version=ifelse([$1], ,2.2.1,$1)
if test -z "$5" ; then
AC_MSG_CHECKING([for wxWidgets version >= $min_wx_version])
else
AC_MSG_CHECKING([for wxWidgets version >= $min_wx_version ($5)])
fi
WX_CONFIG_WITH_ARGS="$WX_CONFIG_PATH $wx_config_args $5 $4"
WX_VERSION=`$WX_CONFIG_WITH_ARGS --version 2>/dev/null`
wx_config_major_version=`echo $WX_VERSION | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
wx_config_minor_version=`echo $WX_VERSION | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
wx_config_micro_version=`echo $WX_VERSION | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
wx_requested_major_version=`echo $min_wx_version | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
wx_requested_minor_version=`echo $min_wx_version | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
wx_requested_micro_version=`echo $min_wx_version | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
_WX_PRIVATE_CHECK_VERSION([$wx_requested_major_version],
[$wx_requested_minor_version],
[$wx_requested_micro_version])
if test -n "$wx_ver_ok"; then
AC_MSG_RESULT(yes (version $WX_VERSION))
WX_LIBS=`$WX_CONFIG_WITH_ARGS --libs`
dnl is this even still appropriate? --static is a real option now
dnl and WX_CONFIG_WITH_ARGS is likely to contain it if that is
dnl what the user actually wants, making this redundant at best.
dnl For now keep it in case anyone actually used it in the past.
AC_MSG_CHECKING([for wxWidgets static library])
WX_LIBS_STATIC=`$WX_CONFIG_WITH_ARGS --static --libs 2>/dev/null`
if test "x$WX_LIBS_STATIC" = "x"; then
AC_MSG_RESULT(no)
else
AC_MSG_RESULT(yes)
fi
dnl starting with version 2.2.6 wx-config has --cppflags argument
wx_has_cppflags=""
if test $wx_config_major_version -gt 2; then
wx_has_cppflags=yes
else
if test $wx_config_major_version -eq 2; then
if test $wx_config_minor_version -gt 2; then
wx_has_cppflags=yes
else
if test $wx_config_minor_version -eq 2; then
if test $wx_config_micro_version -ge 6; then
wx_has_cppflags=yes
fi
fi
fi
fi
fi
dnl starting with version 2.7.0 wx-config has --rescomp option
wx_has_rescomp=""
if test $wx_config_major_version -gt 2; then
wx_has_rescomp=yes
else
if test $wx_config_major_version -eq 2; then
if test $wx_config_minor_version -ge 7; then
wx_has_rescomp=yes
fi
fi
fi
if test "x$wx_has_rescomp" = x ; then
dnl cannot give any useful info for resource compiler
WX_RESCOMP=
else
WX_RESCOMP=`$WX_CONFIG_WITH_ARGS --rescomp`
fi
if test "x$wx_has_cppflags" = x ; then
dnl no choice but to define all flags like CFLAGS
WX_CFLAGS=`$WX_CONFIG_WITH_ARGS --cflags`
WX_CPPFLAGS=$WX_CFLAGS
WX_CXXFLAGS=$WX_CFLAGS
WX_CFLAGS_ONLY=$WX_CFLAGS
WX_CXXFLAGS_ONLY=$WX_CFLAGS
else
dnl we have CPPFLAGS included in CFLAGS included in CXXFLAGS
WX_CPPFLAGS=`$WX_CONFIG_WITH_ARGS --cppflags`
WX_CXXFLAGS=`$WX_CONFIG_WITH_ARGS --cxxflags`
WX_CFLAGS=`$WX_CONFIG_WITH_ARGS --cflags`
WX_CFLAGS_ONLY=`echo $WX_CFLAGS | sed "s@^$WX_CPPFLAGS *@@"`
WX_CXXFLAGS_ONLY=`echo $WX_CXXFLAGS | sed "s@^$WX_CFLAGS *@@"`
fi
ifelse([$2], , :, [$2])
else
if test "x$WX_VERSION" = x; then
dnl no wx-config at all
AC_MSG_RESULT(no)
else
AC_MSG_RESULT(no (version $WX_VERSION is not new enough))
fi
WX_CFLAGS=""
WX_CPPFLAGS=""
WX_CXXFLAGS=""
WX_LIBS=""
WX_LIBS_STATIC=""
WX_RESCOMP=""
ifelse([$3], , :, [$3])
fi
else
WX_CFLAGS=""
WX_CPPFLAGS=""
WX_CXXFLAGS=""
WX_LIBS=""
WX_LIBS_STATIC=""
WX_RESCOMP=""
ifelse([$3], , :, [$3])
fi
AC_SUBST(WX_CPPFLAGS)
AC_SUBST(WX_CFLAGS)
AC_SUBST(WX_CXXFLAGS)
AC_SUBST(WX_CFLAGS_ONLY)
AC_SUBST(WX_CXXFLAGS_ONLY)
AC_SUBST(WX_LIBS)
AC_SUBST(WX_LIBS_STATIC)
AC_SUBST(WX_VERSION)
AC_SUBST(WX_RESCOMP)
])
dnl ---------------------------------------------------------------------------
dnl Get information on the wxrc program for making C++, Python and xrs
dnl resource files.
dnl
dnl AC_ARG_ENABLE(...)
dnl AC_ARG_WITH(...)
dnl ...
dnl AM_OPTIONS_WXCONFIG
dnl ...
dnl AM_PATH_WXCONFIG(2.6.0, wxWin=1)
dnl if test "$wxWin" != 1; then
dnl AC_MSG_ERROR([
dnl wxWidgets must be installed on your system
dnl but wx-config script couldn't be found.
dnl
dnl Please check that wx-config is in path, the directory
dnl where wxWidgets libraries are installed (returned by
dnl 'wx-config --libs' command) is in LD_LIBRARY_PATH or
dnl equivalent variable and wxWidgets version is 2.6.0 or above.
dnl ])
dnl fi
dnl
dnl AM_PATH_WXRC([HAVE_WXRC=1], [HAVE_WXRC=0])
dnl if test "x$HAVE_WXRC" != x1; then
dnl AC_MSG_ERROR([
dnl The wxrc program was not installed or not found.
dnl
dnl Please check the wxWidgets installation.
dnl ])
dnl fi
dnl
dnl CPPFLAGS="$CPPFLAGS $WX_CPPFLAGS"
dnl CXXFLAGS="$CXXFLAGS $WX_CXXFLAGS_ONLY"
dnl CFLAGS="$CFLAGS $WX_CFLAGS_ONLY"
dnl
dnl LDFLAGS="$LDFLAGS $WX_LIBS"
dnl ---------------------------------------------------------------------------
dnl ---------------------------------------------------------------------------
dnl AM_PATH_WXRC([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
dnl
dnl Test for wxWidgets' wxrc program for creating either C++, Python or XRS
dnl resources. The variable WXRC will be set and substituted in the configure
dnl script and Makefiles.
dnl
dnl Example use:
dnl AM_PATH_WXRC([wxrc=1], [wxrc=0])
dnl ---------------------------------------------------------------------------
dnl
dnl wxrc program from the wx-config script
dnl
AC_DEFUN([AM_PATH_WXRC],
[
AC_ARG_VAR([WXRC], [Path to wxWidget's wxrc resource compiler])
if test "x$WX_CONFIG_NAME" = x; then
AC_MSG_ERROR([The wxrc tests must run after wxWidgets test.])
else
AC_MSG_CHECKING([for wxrc])
if test "x$WXRC" = x ; then
dnl wx-config --utility is a new addition to wxWidgets:
_WX_PRIVATE_CHECK_VERSION(2,5,3)
if test -n "$wx_ver_ok"; then
WXRC=`$WX_CONFIG_WITH_ARGS --utility=wxrc`
fi
fi
if test "x$WXRC" = x ; then
AC_MSG_RESULT([not found])
ifelse([$2], , :, [$2])
else
AC_MSG_RESULT([$WXRC])
ifelse([$1], , :, [$1])
fi
AC_SUBST(WXRC)
fi
])
# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional])
#
# DESCRIPTION
#
# Check for baseline language coverage in the compiler for the specified
# version of the C++ standard. If necessary, add switches to CXX and
# CXXCPP to enable support. VERSION may be '11', '14', '17', or '20' for
# the respective C++ standard version.
#
# The second argument, if specified, indicates whether you insist on an
# extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
# -std=c++11). If neither is specified, you get whatever works, with
# preference for no added switch, and then for an extended mode.
#
# The third argument, if specified 'mandatory' or if left unspecified,
# indicates that baseline support for the specified C++ standard is
# required and that the macro should error out if no mode with that
# support is found. If specified 'optional', then configuration proceeds
# regardless, after defining HAVE_CXX${VERSION} if and only if a
# supporting mode is found.
#
# LICENSE
#
# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
# Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
# Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
# Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
# Copyright (c) 2015 Paul Norman <penorman@mac.com>
# Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
# Copyright (c) 2016, 2018 Krzesimir Nowak <qdlacz@gmail.com>
# Copyright (c) 2019 Enji Cooper <yaneurabeya@gmail.com>
# Copyright (c) 2020 Jason Merrill <jason@redhat.com>
# Copyright (c) 2021 Jörn Heusipp <osmanx@problemloesungsmaschine.de>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 18
dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
dnl (serial version number 13).
AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
m4_if([$1], [11], [ax_cxx_compile_alternatives="11 0x"],
[$1], [14], [ax_cxx_compile_alternatives="14 1y"],
[$1], [17], [ax_cxx_compile_alternatives="17 1z"],
[$1], [20], [ax_cxx_compile_alternatives="20"],
[m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
m4_if([$2], [], [],
[$2], [ext], [],
[$2], [noext], [],
[m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl
m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true],
[$3], [mandatory], [ax_cxx_compile_cxx$1_required=true],
[$3], [optional], [ax_cxx_compile_cxx$1_required=false],
[m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])])
AC_LANG_PUSH([C++])dnl
ac_success=no
m4_if([$2], [], [dnl
AC_CACHE_CHECK(whether $CXX supports C++$1 features by default,
ax_cv_cxx_compile_cxx$1,
[AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
[ax_cv_cxx_compile_cxx$1=yes],
[ax_cv_cxx_compile_cxx$1=no])])
if test x$ax_cv_cxx_compile_cxx$1 = xyes; then
ac_success=yes
fi])
m4_if([$2], [noext], [], [dnl
if test x$ac_success = xno; then
for alternative in ${ax_cxx_compile_alternatives}; do
switch="-std=gnu++${alternative}"
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
$cachevar,
[ac_save_CXX="$CXX"
CXX="$CXX $switch"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
[eval $cachevar=yes],
[eval $cachevar=no])
CXX="$ac_save_CXX"])
if eval test x\$$cachevar = xyes; then
CXX="$CXX $switch"
if test -n "$CXXCPP" ; then
CXXCPP="$CXXCPP $switch"
fi
ac_success=yes
break
fi
done
fi])
m4_if([$2], [ext], [], [dnl
if test x$ac_success = xno; then
dnl HP's aCC needs +std=c++11 according to:
dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
dnl Cray's crayCC needs "-h std=c++11"
dnl MSVC needs -std:c++NN for C++17 and later (default is C++14)
for alternative in ${ax_cxx_compile_alternatives}; do
for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}" MSVC; do
if test x"$switch" = xMSVC; then
dnl AS_TR_SH maps both `:` and `=` to `_` so -std:c++17 would collide
dnl with -std=c++17. We suffix the cache variable name with _MSVC to
dnl avoid this.
switch=-std:c++${alternative}
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_${switch}_MSVC])
else
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
fi
AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
$cachevar,
[ac_save_CXX="$CXX"
CXX="$CXX $switch"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
[eval $cachevar=yes],
[eval $cachevar=no])
CXX="$ac_save_CXX"])
if eval test x\$$cachevar = xyes; then
CXX="$CXX $switch"
if test -n "$CXXCPP" ; then
CXXCPP="$CXXCPP $switch"
fi
ac_success=yes
break
fi
done
if test x$ac_success = xyes; then
break
fi
done
fi])
AC_LANG_POP([C++])
if test x$ax_cxx_compile_cxx$1_required = xtrue; then
if test x$ac_success = xno; then
AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
fi
fi
if test x$ac_success = xno; then
HAVE_CXX$1=0
AC_MSG_NOTICE([No compiler with C++$1 support was found])
else
HAVE_CXX$1=1
AC_DEFINE(HAVE_CXX$1,1,
[define if the compiler supports basic C++$1 syntax])
fi
AC_SUBST(HAVE_CXX$1)
])
dnl Test body for checking C++11 support
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11],
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
)
dnl Test body for checking C++14 support
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
)
dnl Test body for checking C++17 support
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17],
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
_AX_CXX_COMPILE_STDCXX_testbody_new_in_17
)
dnl Test body for checking C++20 support
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_20],
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
_AX_CXX_COMPILE_STDCXX_testbody_new_in_17
_AX_CXX_COMPILE_STDCXX_testbody_new_in_20
)
dnl Tests for new features in C++11
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
// If the compiler admits that it is not ready for C++11, why torture it?
// Hopefully, this will speed up the test.
#ifndef __cplusplus
#error "This is not a C++ compiler"
// MSVC always sets __cplusplus to 199711L in older versions; newer versions
// only set it correctly if /Zc:__cplusplus is specified as well as a
// /std:c++NN switch:
// https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/
#elif __cplusplus < 201103L && !defined _MSC_VER
#error "This is not a C++11 compiler"
#else
namespace cxx11
{
namespace test_static_assert
{
template <typename T>
struct check
{
static_assert(sizeof(int) <= sizeof(T), "not big enough");
};
}
namespace test_final_override
{
struct Base
{
virtual ~Base() {}
virtual void f() {}
};
struct Derived : public Base
{
virtual ~Derived() override {}
virtual void f() override {}
};
}
namespace test_double_right_angle_brackets
{
template < typename T >
struct check {};
typedef check<void> single_type;
typedef check<check<void>> double_type;
typedef check<check<check<void>>> triple_type;
typedef check<check<check<check<void>>>> quadruple_type;
}
namespace test_decltype
{
int
f()
{
int a = 1;
decltype(a) b = 2;
return a + b;
}
}
namespace test_type_deduction
{
template < typename T1, typename T2 >
struct is_same
{
static const bool value = false;
};
template < typename T >
struct is_same<T, T>
{
static const bool value = true;
};
template < typename T1, typename T2 >
auto
add(T1 a1, T2 a2) -> decltype(a1 + a2)
{
return a1 + a2;
}
int
test(const int c, volatile int v)
{
static_assert(is_same<int, decltype(0)>::value == true, "");
static_assert(is_same<int, decltype(c)>::value == false, "");
static_assert(is_same<int, decltype(v)>::value == false, "");
auto ac = c;
auto av = v;
auto sumi = ac + av + 'x';
auto sumf = ac + av + 1.0;
static_assert(is_same<int, decltype(ac)>::value == true, "");
static_assert(is_same<int, decltype(av)>::value == true, "");
static_assert(is_same<int, decltype(sumi)>::value == true, "");
static_assert(is_same<int, decltype(sumf)>::value == false, "");
static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
return (sumf > 0.0) ? sumi : add(c, v);
}
}
namespace test_noexcept
{
int f() { return 0; }
int g() noexcept { return 0; }
static_assert(noexcept(f()) == false, "");
static_assert(noexcept(g()) == true, "");
}
namespace test_constexpr
{
template < typename CharT >
unsigned long constexpr
strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
{
return *s ? strlen_c_r(s + 1, acc + 1) : acc;
}
template < typename CharT >
unsigned long constexpr
strlen_c(const CharT *const s) noexcept
{
return strlen_c_r(s, 0UL);
}
static_assert(strlen_c("") == 0UL, "");
static_assert(strlen_c("1") == 1UL, "");
static_assert(strlen_c("example") == 7UL, "");
static_assert(strlen_c("another\0example") == 7UL, "");
}
namespace test_rvalue_references
{
template < int N >
struct answer
{
static constexpr int value = N;
};
answer<1> f(int&) { return answer<1>(); }
answer<2> f(const int&) { return answer<2>(); }
answer<3> f(int&&) { return answer<3>(); }
void
test()
{
int i = 0;
const int c = 0;
static_assert(decltype(f(i))::value == 1, "");
static_assert(decltype(f(c))::value == 2, "");
static_assert(decltype(f(0))::value == 3, "");
}
}
namespace test_uniform_initialization
{
struct test
{
static const int zero {};
static const int one {1};
};
static_assert(test::zero == 0, "");
static_assert(test::one == 1, "");
}
namespace test_lambdas
{
void
test1()
{
auto lambda1 = [](){};
auto lambda2 = lambda1;
lambda1();
lambda2();
}
int
test2()
{
auto a = [](int i, int j){ return i + j; }(1, 2);
auto b = []() -> int { return '0'; }();
auto c = [=](){ return a + b; }();
auto d = [&](){ return c; }();
auto e = [a, &b](int x) mutable {
const auto identity = [](int y){ return y; };
for (auto i = 0; i < a; ++i)
a += b--;
return x + identity(a + b);
}(0);
return a + b + c + d + e;
}
int
test3()
{
const auto nullary = [](){ return 0; };
const auto unary = [](int x){ return x; };
using nullary_t = decltype(nullary);
using unary_t = decltype(unary);
const auto higher1st = [](nullary_t f){ return f(); };
const auto higher2nd = [unary](nullary_t f1){
return [unary, f1](unary_t f2){ return f2(unary(f1())); };
};
return higher1st(nullary) + higher2nd(nullary)(unary);
}
}
namespace test_variadic_templates
{
template <int...>
struct sum;
template <int N0, int... N1toN>
struct sum<N0, N1toN...>
{
static constexpr auto value = N0 + sum<N1toN...>::value;
};
template <>
struct sum<>
{
static constexpr auto value = 0;
};
static_assert(sum<>::value == 0, "");
static_assert(sum<1>::value == 1, "");
static_assert(sum<23>::value == 23, "");
static_assert(sum<1, 2>::value == 3, "");
static_assert(sum<5, 5, 11>::value == 21, "");
static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
}
// http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
// Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
// because of this.
namespace test_template_alias_sfinae
{
struct foo {};
template<typename T>
using member = typename T::member_type;
template<typename T>
void func(...) {}
template<typename T>
void func(member<T>*) {}
void test();
void test() { func<foo>(0); }
}
} // namespace cxx11
#endif // __cplusplus >= 201103L
]])
dnl Tests for new features in C++14
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
// If the compiler admits that it is not ready for C++14, why torture it?
// Hopefully, this will speed up the test.
#ifndef __cplusplus
#error "This is not a C++ compiler"
#elif __cplusplus < 201402L && !defined _MSC_VER
#error "This is not a C++14 compiler"
#else
namespace cxx14
{
namespace test_polymorphic_lambdas
{
int
test()
{
const auto lambda = [](auto&&... args){
const auto istiny = [](auto x){
return (sizeof(x) == 1UL) ? 1 : 0;
};
const int aretiny[] = { istiny(args)... };
return aretiny[0];
};
return lambda(1, 1L, 1.0f, '1');
}
}
namespace test_binary_literals
{
constexpr auto ivii = 0b0000000000101010;
static_assert(ivii == 42, "wrong value");
}
namespace test_generalized_constexpr
{
template < typename CharT >
constexpr unsigned long
strlen_c(const CharT *const s) noexcept
{
auto length = 0UL;
for (auto p = s; *p; ++p)
++length;
return length;
}
static_assert(strlen_c("") == 0UL, "");
static_assert(strlen_c("x") == 1UL, "");
static_assert(strlen_c("test") == 4UL, "");
static_assert(strlen_c("another\0test") == 7UL, "");
}
namespace test_lambda_init_capture
{
int
test()
{
auto x = 0;
const auto lambda1 = [a = x](int b){ return a + b; };
const auto lambda2 = [a = lambda1(x)](){ return a; };
return lambda2();
}
}
namespace test_digit_separators
{
constexpr auto ten_million = 100'000'000;
static_assert(ten_million == 100000000, "");
}
namespace test_return_type_deduction
{
auto f(int& x) { return x; }
decltype(auto) g(int& x) { return x; }
template < typename T1, typename T2 >
struct is_same
{
static constexpr auto value = false;
};
template < typename T >
struct is_same<T, T>
{
static constexpr auto value = true;
};
int
test()
{
auto x = 0;
static_assert(is_same<int, decltype(f(x))>::value, "");
static_assert(is_same<int&, decltype(g(x))>::value, "");
return x;
}
}
} // namespace cxx14
#endif // __cplusplus >= 201402L
]])
dnl Tests for new features in C++17
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_17], [[
// If the compiler admits that it is not ready for C++17, why torture it?
// Hopefully, this will speed up the test.
#ifndef __cplusplus
#error "This is not a C++ compiler"
#elif __cplusplus < 201703L && !defined _MSC_VER
#error "This is not a C++17 compiler"