configure.ac

# Process this file with autoconf to produce a configure script.
AC_INIT(GUSbase, 0.1)
AC_CONFIG_SRCDIR([src/pest_em.c])

# find R home and set CC/CFLAGS
: ${R_HOME=`R RHOME`}
if test -z "${R_HOME}"; then
echo "could not determine R_HOME"
exit 1
fi
RBIN="${R_HOME}/bin/R"
CC=`"${RBIN}" CMD config CC`;
CFLAGS=`"${RBIN}" CMD config CFLAGS`
LIBS="${PKG_LIBS}"

# Checks for programs.
AC_PROG_CC
# Check for OpenMP
AC_OPENMP

# since some systems have broken OMP libraries
# we also check that the actual package will work
ac_pkg_openmp=no
if test -n "${OPENMP_CFLAGS}"; then
AC_MSG_CHECKING([whether OpenMP will work in a package])
AC_LANG_CONFTEST(
  [AC_LANG_PROGRAM([[#include <omp.h>]], [[ return omp_get_num_threads (); ]])])
    PKG_CFLAGS="${OPENMP_CFLAGS}" PKG_LIBS="${OPENMP_CFLAGS}" "$RBIN" CMD SHLIB conftest.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD && "$RBIN" --vanilla -q -e "dyn.load(paste('conftest',.Platform\$dynlib.ext,sep=''))" 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD && ac_pkg_openmp=yes
    AC_MSG_RESULT([${ac_pkg_openmp}])
    fi

    # if ${ac_pkg_openmp} = "yes" then we have OMP, otherwise it will be "no"
    if test "${ac_pkg_openmp}" = no; then
    OPENMP_CFLAGS=''
    # you could put AC_MSG_ERROR here is OpenMP is required
    fi

    AC_SUBST(OPENMP_CFLAGS)

    AC_CONFIG_FILES([src/Makevars])
    AC_OUTPUT