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## Copyright (C) 2010-2015 M. Marques, X. Andrade, D. Strubbe, M. Oliveira
##
## This Source Code Form is subject to the terms of the Mozilla Public
## License, v. 2.0. If a copy of the MPL was not distributed with this
## file, You can obtain one at http://mozilla.org/MPL/2.0/.
##
##
AC_DEFUN([ACX_LIBXC], [
acx_libxc_ok=no
dnl Check if the library was given in the command line
dnl if not, use environment variables or defaults
AC_ARG_WITH(libxc-prefix, [AS_HELP_STRING([--with-libxc-prefix=DIR], [Directory where libxc was installed.])])
# Set FCFLAGS_LIBXC only if not set from environment
if test x"$FCFLAGS_LIBXC" = x; then
case $with_libxc_prefix in
"") FCFLAGS_LIBXC="$ax_cv_f90_modflag/usr/include" ;;
*) FCFLAGS_LIBXC="$ax_cv_f90_modflag$with_libxc_prefix/include" ;;
esac
fi
AC_ARG_WITH(libxc-include, [AS_HELP_STRING([--with-libxc-include=DIR], [Directory where libxc Fortran headers were installed.])])
case $with_libxc_include in
"") ;;
*) FCFLAGS_LIBXC="$ax_cv_f90_modflag$with_libxc_include" ;;
esac
dnl Backup LIBS and FCFLAGS
acx_libxc_save_LIBS="$LIBS"
acx_libxc_save_FCFLAGS="$FCFLAGS"
dnl The tests
AC_MSG_CHECKING([for libxc])
testprog="AC_LANG_PROGRAM([],[
use xc_f90_lib_m
implicit none
integer :: major
integer :: minor
call xc_f90_version(major, minor)])"
FCFLAGS="$FCFLAGS_LIBXC $acx_libxc_save_FCFLAGS"
# set from environment variable, if not blank
if test ! -z "$LIBS_LIBXC"; then
LIBS="$LIBS_LIBXC $acx_libxc_save_LIBS"
AC_LINK_IFELSE($testprog, [acx_libxc_ok=yes], [])
fi
if test ! -z "$with_libxc_prefix"; then
# static linkage, separate Fortran interface (libxc 2.2.0 and later)
if test x"$acx_libxc_ok" = xno; then
LIBS_LIBXC="$with_libxc_prefix/lib/libxcf90.a $with_libxc_prefix/lib/libxc.a"
LIBS="$LIBS_LIBXC $acx_libxc_save_LIBS"
AC_LINK_IFELSE($testprog, [acx_libxc_ok=yes], [])
fi
# static linkage, combined Fortran interface (libxc 2.0.x, 2.1.x)
if test x"$acx_libxc_ok" = xno; then
LIBS_LIBXC="$with_libxc_prefix/lib/libxc.a"
LIBS="$LIBS_LIBXC $acx_libxc_save_LIBS"
AC_LINK_IFELSE($testprog, [acx_libxc_ok=yes], [])
fi
fi
# dynamic linkage, separate Fortran interface (libxc 2.2.0 and later)
if test x"$acx_libxc_ok" = xno; then
if test ! -z "$with_libxc_prefix"; then
LIBS_LIBXC="-L$with_libxc_prefix/lib"
else
LIBS_LIBXC=""
fi
LIBS_LIBXC="$LIBS_LIBXC -lxcf90 -lxc"
LIBS="$LIBS_LIBXC $acx_libxc_save_LIBS"
AC_LINK_IFELSE($testprog, [acx_libxc_ok=yes], [])
fi
# dynamic linkage, combined Fortran interface (libxc 2.0.x, 2.1.x)
if test x"$acx_libxc_ok" = xno; then
if test ! -z "$with_libxc_prefix"; then
LIBS_LIBXC="-L$with_libxc_prefix/lib"
else
LIBS_LIBXC=""
fi
LIBS_LIBXC="$LIBS_LIBXC -lxc"
LIBS="$LIBS_LIBXC $acx_libxc_save_LIBS"
AC_LINK_IFELSE($testprog, [acx_libxc_ok=yes], [])
fi
AC_MSG_RESULT([$acx_libxc_ok ($FCFLAGS_LIBXC $LIBS_LIBXC)])
dnl Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$acx_libxc_ok" = xyes; then
AC_DEFINE(HAVE_LIBXC, 1, [Defined if you have the LIBXC library.])
else
AC_MSG_ERROR([Could not find required libxc library ( >= v 2.0.0).])
fi
acx_libxc_hyb_mgga_ok=no
AC_MSG_CHECKING([whether libxc has support for hybrid meta-GGAs (>= v 2.1)])
testprog="AC_LANG_PROGRAM([],[
use xc_f90_lib_m
implicit none
integer :: x = XC_FAMILY_HYB_MGGA])"
AC_LINK_IFELSE($testprog, [acx_libxc_hyb_mgga_ok=yes], [])
AC_MSG_RESULT([$acx_libxc_hyb_mgga_ok])
if test x"$acx_libxc_hyb_mgga_ok" = xyes; then
AC_DEFINE(HAVE_LIBXC_HYB_MGGA, 1, [Defined if LIBXC library has support for hybrid meta-GGAs.])
fi
AC_SUBST(FCFLAGS_LIBXC)
AC_SUBST(LIBS_LIBXC)
FCFLAGS="$acx_libxc_save_FCFLAGS"
LIBS="$acx_libxc_save_LIBS"
])dnl ACX_LIBXC
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