# Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

################################################################################

# Setup libffi (Foreign Function Interface)

################################################################################

AC_DEFUN_ONCE([LIB_SETUP_LIBFFI],

  AC_ARG_WITH(libffi, [AS_HELP_STRING([--with-libffi],

      [specify prefix directory for the libffi package

      (expecting the libraries under PATH/lib and the headers under PATH/include)])])

  AC_ARG_WITH(libffi-include, [AS_HELP_STRING([--with-libffi-include],

      [specify directory for the libffi include files])])

  AC_ARG_WITH(libffi-lib, [AS_HELP_STRING([--with-libffi-lib],

      [specify directory for the libffi library])])

  if test "x$NEEDS_LIB_FFI" = xfalse; then

    if test "x${with_libffi}" != x || test "x${with_libffi_include}" != x || test "x${with_libffi_lib}" != x; then

      AC_MSG_WARN([libffi not used, so --with-libffi is ignored])

    LIBFFI_CFLAGS=

    LIBFFI_LIBS=

    LIBFFI_FOUND=no

    if test "x${with_libffi}" = xno || test "x${with_libffi_include}" = xno || test "x${with_libffi_lib}" = xno; then

      AC_MSG_ERROR([It is not possible to disable the use of libffi. Remove the --without-libffi option.])

    if test "x${with_libffi}" != x; then

      LIBFFI_LIBS="-L${with_libffi}/lib -lffi"

      LIBFFI_CFLAGS="-I${with_libffi}/include"

      LIBFFI_FOUND=yes

    fi

    if test "x${with_libffi_include}" != x; then

      LIBFFI_CFLAGS="-I${with_libffi_include}"

      LIBFFI_FOUND=yes

    fi

    if test "x${with_libffi_lib}" != x; then

      LIBFFI_LIBS="-L${with_libffi_lib} -lffi"

      LIBFFI_FOUND=yes

    # Do not try pkg-config if we have a sysroot set.

    if test "x$SYSROOT" = x; then

      if test "x$LIBFFI_FOUND" = xno; then

        # Figure out LIBFFI_CFLAGS and LIBFFI_LIBS

        PKG_CHECK_MODULES([LIBFFI], [libffi], [LIBFFI_FOUND=yes], [LIBFFI_FOUND=no])

      fi

    if test "x$LIBFFI_FOUND" = xno; then

      AC_CHECK_HEADERS([ffi.h],

            LIBFFI_FOUND=yes

            LIBFFI_CFLAGS=

            LIBFFI_LIBS=-lffi

          ],

          [LIBFFI_FOUND=no]

    if test "x$LIBFFI_FOUND" = xno; then

      HELP_MSG_MISSING_DEPENDENCY([ffi])

      AC_MSG_ERROR([Could not find libffi! $HELP_MSG])

    AC_MSG_CHECKING([if libffi works])

    AC_LANG_PUSH(C)

    OLD_CFLAGS="$CFLAGS"

    CFLAGS="$CFLAGS $LIBFFI_CFLAGS"

    OLD_LIBS="$LIBS"

    LIBS="$LIBS $LIBFFI_LIBS"

    AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <ffi.h>],

        [

          ffi_call(NULL, NULL, NULL, NULL);

          return 0;

        ])],

        [LIBFFI_WORKS=yes],

        [LIBFFI_WORKS=no]

    )

    CFLAGS="$OLD_CFLAGS"

    LIBS="$OLD_LIBS"

    AC_LANG_POP(C)

    AC_MSG_RESULT([$LIBFFI_WORKS])

    if test "x$LIBFFI_WORKS" = xno; then

      HELP_MSG_MISSING_DEPENDENCY([ffi])

      AC_MSG_ERROR([Found libffi but could not link and compile with it. $HELP_MSG])

  AC_SUBST(LIBFFI_CFLAGS)

  AC_SUBST(LIBFFI_LIBS)