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# Tests for GNU GMP (or any compatible replacement).

dnl Copyright (C) 2008-2013 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl Written by James Youngman.

dnl Check for libgmp.  We avoid use of AC_CHECK_LIBS because we don't want to
dnl add this to $LIBS for all targets.
AC_DEFUN([cu_GMP],
[
  LIB_GMP=
  AC_SUBST([LIB_GMP])

  AC_ARG_WITH([gmp],
    AS_HELP_STRING([--without-gmp],
      [do not use the GNU MP library for arbitrary precision
       calculation (default: use it if available)]),
    [cu_use_gmp=$withval],
    [cu_use_gmp=auto])

  if test $cu_use_gmp != no; then
    cu_saved_libs=$LIBS
    AC_SEARCH_LIBS([__gmpz_init], [gmp],
      [test "$ac_cv_search___gmpz_init" = "none required" ||
       {
        LIB_GMP=$ac_cv_search___gmpz_init
        AC_DEFINE([HAVE_GMP], [1],
          [Define if you have GNU libgmp (or replacement)])
        # This only available in GMP >= 5
        AC_CHECK_DECLS([mpz_inits], [], [], [[#include <gmp.h>]])
       }],
      [AC_MSG_WARN([libgmp development library was not found or not usable.])
       AC_MSG_WARN([AC_PACKAGE_NAME will be built without GMP support.])])
    LIBS=$cu_saved_libs
  fi
])