/usr/share/dune/aclocal/cxx11_constexpr.m4 is in libdune-common-dev 2.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | # tests for C++11 constexpr support
# the associated macro is called HAVE_CONSTEXPR
AC_DEFUN([CXX11_CONSTEXPR_CHECK],[
AC_CACHE_CHECK([for C++11 constexpr], dune_cv_cxx11_constexpr_support, [
AC_REQUIRE([AC_PROG_CXX])
AC_REQUIRE([CXX11])
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([
constexpr int foo () { return 0; }
template< int v >
struct A
{
static const int value = v;
};
],[
return A< foo() >::value;
])],
dune_cv_cxx11_constexpr_support=yes,
dune_cv_cxx11_constexpr_support=no)
AC_LANG_POP
])
if test "x$dune_cv_cxx11_constexpr_support" = xyes; then
AC_DEFINE(HAVE_CONSTEXPR, 1, [Define to 1 if C++11 constexpr is supported])
fi
])
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