dnl  **************************************************
dnl    Copyright (C) 2004   Matteo Settenvini
dnl  **************************************************

dnl ---------- AC_CHECK_CXXFLAG ---------------------
dnl This macro checks if a particular flag for the 
dnl C++ compiler works. If it is so, it puts the flag 
dnl into the first macro parameter. 
dnl Example of usage : AC_CHECK_CXXFLAG([CXXFLAGS],[Wall])
dnl -------------------------------------------------
AC_DEFUN([AC_CHECK_CXXFLAG],
[ if test -z "$1" -o -z "$2"; then
	AC_MSG_FAILURE([Wrong parameters passed to the m4 macro. 
Please contact the package mantainer.])
  fi
  AC_REQUIRE([AC_PROG_CXX])dnl
  AC_MSG_CHECKING([whether $CXX supports the -$2 flag])
  ac_check_cxxflags=$CXXFLAGS
  CXXFLAGS="-$2"
  AC_LANG_PUSH([C++])
  AC_COMPILE_IFELSE(
    AC_LANG_PROGRAM([], [return 0;]),
    [AC_MSG_RESULT([yes])
      CXXFLAGS="$ac_check_cxxflags"
      $1="-$2 $[$1]" ],
    [AC_MSG_RESULT([no])
      CXXFLAGS=$ac_check_cxxflags ]
  )
  AC_LANG_POP
])dnl ------- AC_CHECK_CXXFLAG ----------------------



dnl ---------- AC_CHECK_CFLAG ---------------------
dnl This macro checks if a particular flag for the 
dnl C compiler works. If it is so, it adds the flag 
dnl into the first macro parameter.
dnl Example of usage : AC_CHECK_CFLAG([CFLAGS],[Wall])
dnl -------------------------------------------------
AC_DEFUN([AC_CHECK_CFLAG],
[ if test -z "$1" -o -z "$2"; then
	AC_MSG_FAILURE([Wrong parameters passed to the m4 macro. 
Please contact the package mantainer.])
  fi
  AC_REQUIRE([AC_PROG_CC])dnl
  AC_MSG_CHECKING([whether $CC supports the -$2 flag])
  ac_check_cflags=$CFLAGS
  CFLAGS="-$2"
  AC_LANG_PUSH([C])
  AC_COMPILE_IFELSE(
    AC_LANG_PROGRAM([], [return 0;]),
    [AC_MSG_RESULT([yes])
      CFLAGS="$ac_check_cflags"
      $1="-$2 $[$1]" ],
    [AC_MSG_RESULT([no])
      CFLAGS=$ac_check_cflags ]
  )
  AC_LANG_POP
])dnl ------- AC_CHECK_CFLAG ----------------------