# Extra functions for configure.in

# Run a *-config script and pull out the cflags and libs settings
AC_DEFUN([LIB_CONFIG],[
   AC_PATH_PROG([$1], [$2])
   CONFIG_PATH=${$1}
   if test "x$CONFIG_PATH" = "x"; then
      AC_MSG_ERROR([Could not find $2 in PATH; is $3 installed?])
   fi

   $4="$($CONFIG_PATH --cflags) ${$4}"
   $5="$($CONFIG_PATH --libs) ${$5}"
])

# Basically like LIB_CONFIG, but for pkg-config stuff
#AC_DEFUN([PKG_CONFIG],[
#   AC_PATH_PROG(pkg_config, pkg-config)
#   CONFIG_PATH=${pkg_config}
#   if test "x$CONFIG_PATH" = "x"; then
#      AC_MSG_ERROR([Could not find pkg-config in PATH; is it installed?])
#   fi
#
#   $2="$($CONFIG_PATH $1 --cflags) ${$2}"
#   $3="$($CONFIG_PATH $1 --libs) ${$3cx}"
#])

# Check for a function; if it doesn't exist, puke
AC_DEFUN(REQUIRE_FUNC, [
   AC_CHECK_FUNCS($1)
   if test $ac_cv_func_$1 = no; then
     AC_MSG_ERROR([Cutlass needs the function $1(), but it cannot be found]);
   fi
])

AC_DEFUN(CHECK_PTHREADS, [
   case "$target" in
      *-*-freebsd* | *-*-openbsd*)
         pthread_cflags="-D_REENTRANT -D_THREAD_SAFE"
         pthread_lib="-pthread"
      ;;
      *)
         pthread_cflags="-D_REENTRANT"
         pthread_lib="-lpthread"
      ;;
   esac

   LIBS="$pthread_lib $LIBS"
   CFLAGS="$pthread_cflags $CFLAGS"
   CXXFLAGS="$pthread_cflags $CXXFLAGS"

   AC_MSG_CHECKING(for POSIX threads)
   use_pthreads=no
   AC_TRY_LINK([#include <pthread.h>],
      [
      pthread_mutex_t mutex;
      pthread_mutex_init(&mutex, NULL);
      ],
      [use_pthreads=yes],
      [AC_MSG_ERROR("Cutlass requires POSIX threads")]
   );
   AC_MSG_RESULT($pthread_cflags $pthread_lib)
])