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# ===================================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_explicit_instantiations.html
# ===================================================================================
#
# SYNOPSIS
#
# AX_CXX_EXPLICIT_INSTANTIATIONS
#
# DESCRIPTION
#
# If the C++ compiler supports explicit instantiations syntax, define
# HAVE_INSTANTIATIONS.
#
# LICENSE
#
# Copyright (c) 2008 Todd Veldhuizen
# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
#
# 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 10
AU_ALIAS([AC_CXX_EXPLICIT_INSTANTIATIONS], [AX_CXX_EXPLICIT_INSTANTIATIONS])
AC_DEFUN([AX_CXX_EXPLICIT_INSTANTIATIONS],
[AC_CACHE_CHECK(whether the compiler supports explicit instantiations,
ax_cv_cxx_explinst,
[AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[template <class T> class A { T t; }; template class A<int>;]],
[])],
[ax_cv_cxx_explinst=yes],[ax_cv_cxx_explinst=no])
AC_LANG_POP([C++])
])
if test "$ax_cv_cxx_explinst" = yes; then
AC_DEFINE(HAVE_INSTANTIATIONS,,
[define if the compiler supports explicit instantiations])
fi
])
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