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configure: add test for C++14 feature "user-defined literals for std::string"

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This commit is contained in:
Moritz Bunkus 2018-04-20 20:03:57 +02:00
parent 589365a63b
commit c9e931d69e
2 changed files with 34 additions and 7 deletions
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10
README.md
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@ -72,11 +72,11 @@ programs and libraries you absolutely need are:
- A C++ compiler that supports several features of the C++11 and C++14
standards: initializer lists, range-based `for` loops, right angle
brackets, the `auto` keyword, lambda functions, the `nullptr` keyword,
tuples, alias declarations, `std::make_unique()`, digit
separators, binary literals and generic lambdas. Others may be
needed, too. For GCC this means at least v4.9.x; for clang v3.4 or
later.
brackets, the `auto` keyword, lambda functions, the `nullptr`
keyword, tuples, alias declarations, `std::make_unique()`, digit
separators, binary literals, generic lambdas, user-defined literals
for `std::string`. Others may be needed, too. For GCC this means at
least v5.x; for clang v3.4 or later.
- [libEBML v1.3.5](http://dl.matroska.org/downloads/libebml/) or later
and [libMatroska v1.4.8](http://dl.matroska.org/downloads/libmatroska/)

31
ac/c++-features.m4
View File

@ -349,6 +349,32 @@ AC_DEFUN([AX_CXX14_GENERIC_LAMBDAS],[
fi
])
AC_DEFUN([AX_CXX14_USER_DEFINED_LITERALS_FOR_STD_STRING],[
AC_CACHE_CHECK([for support for C++14 feature "User-defined literals for std::string"], [ax_cv_cxx14_user_defined_literals_for_std_string],[
CXXFLAGS_SAVED=$CXXFLAGS
CXXFLAGS="$CXXFLAGS $STD_CXX"
export CXXFLAGS
AC_LANG_PUSH(C++)
AC_TRY_COMPILE(
[
#include <string>
using namespace std::string_literals;
],
[return "hello"s.length();],
[ax_cv_cxx14_user_defined_literals_for_std_string="yes"],
[ax_cv_cxx14_user_defined_literals_for_std_string="no"])
AC_LANG_POP
CXXFLAGS="$CXXFLAGS_SAVED"
])
if ! test x"$ax_cv_cxx14_user_defined_literals_for_std_string" = xyes ; then
missing_cxx_features="$missing_cxx_features\n * User-defined literals for std::string (C++14)"
fi
])
dnl AC_DEFUN([AX_CXX14_DEF_NAME],[
dnl AC_CACHE_CHECK([for support for C++14 feature "human"], [ax_cv_cxx14_def_name],[
dnl
@ -385,10 +411,11 @@ AX_CXX14_MAKE_UNIQUE
AX_CXX14_DIGIT_SEPARATORS
AX_CXX14_BINARY_LITERALS
AX_CXX14_GENERIC_LAMBDAS
AX_CXX14_USER_DEFINED_LITERALS_FOR_STD_STRING
if test x"$missing_cxx_features" != x ; then
printf "The following features of the C++11/C++14 standards are not supported by $CXX:$missing_cxx_features\n"
printf "If you are using the GNU C compiler collection (gcc) then you need\n"
printf "at least v4.9.x.\n"
printf "If you are using the GNU C compiler collection (gcc), you need\n"
printf "at least v5.x; for clang the 3.4 and newer should work.\n"
AC_MSG_ERROR([support for required C++11/C++14 features incomplete])
fi