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[buddy] build in C++17 mode by default

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* configure.ac: Activate C++17, and replace --enable-c++17 by
--enable-c++20.
This commit is contained in:
Alexandre Duret-Lutz 2020-07-16 12:14:04 +02:00
parent 4f23097619
commit a7ff5b4eed
1 changed files with 22 additions and 19 deletions
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41
buddy/configure.ac
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@ -18,11 +18,11 @@ AC_PROG_YACC
AC_PROG_CXX
# Option to activate C++17
AC_ARG_ENABLE([c++17],
[AC_HELP_STRING([--enable-c++17],
[Compile in C++17 mode.])],
[enable_17=yes], [enable_17=no])
# Option to activate C++20
AC_ARG_ENABLE([c++20],
[AC_HELP_STRING([--enable-c++20],
[Compile in C++20 mode.])],
[enable_20=yes], [enable_20=no])
LT_INIT([win32-dll])
AX_BSYMBOLIC
@ -50,9 +50,9 @@ if test x$enable_warnings = xyes; then
CF_GCC_WARNINGS
fi
# Turn on C++14 support
# Turn on C++17 support
AC_LANG(C++)
m4_define([_AX_CXX_COMPILE_STDCXX_14_testbody],
m4_define([_AX_CXX_COMPILE_STDCXX_17_testbody],
[AC_LANG_SOURCE([#include <memory>
#include <string>
#include <chrono> // used to fail in C++11 with some installation of clang
@ -76,28 +76,31 @@ m4_define([_AX_CXX_COMPILE_STDCXX_14_testbody],
check_type&& cr = static_cast<check_type&&>(c);
auto d = a;
int aa[[2]] = {1,2};
auto [[x,y]] = aa;
])])
if test x"${enable_17}" = xyes; then
if test x"${enable_20}" = xyes; then
for f in -std=c++20 '-std=c++20 -stdlib=libc++' -std=c++2a
do
AX_CHECK_COMPILE_FLAG([$f], [CXXFLAGS="$CXXFLAGS $f" stdpass=true], [], [],
[_AX_CXX_COMPILE_STDCXX_17_testbody])
${stdpass-false} && break
done
if ! "${stdpass-false}"; then
AC_ERROR([unable to turn on C++20 mode with this compiler])
fi
else
for f in -std=c++17 '-std=c++17 -stdlib=libc++' -std=c++1z
do
AX_CHECK_COMPILE_FLAG([$f], [CXXFLAGS="$CXXFLAGS $f" stdpass=true], [], [],
[_AX_CXX_COMPILE_STDCXX_14_testbody])
[_AX_CXX_COMPILE_STDCXX_17_testbody])
${stdpass-false} && break
done
if ! "${stdpass-false}"; then
AC_ERROR([unable to turn on C++17 mode with this compiler])
fi
else
for f in -std=c++14 '-std=c++14 -stdlib=libc++' -std=c++1y
do
AX_CHECK_COMPILE_FLAG([$f], [CXXFLAGS="$CXXFLAGS $f" stdpass=true], [], [],
[_AX_CXX_COMPILE_STDCXX_14_testbody])
${stdpass-false} && break
done
if ! "${stdpass-false}"; then
AC_ERROR([unable to turn on C++14 mode with this compiler])
fi
fi
AC_CONFIG_HEADERS([config.h])