dnl

dnl Check for compiler mechanism to show functions in debugging

dnl copied from an Ali patch floating on the internet

dnl

AC_DEFUN([AG_GST_CHECK_FUNCTION],[

  dnl #1: __PRETTY_FUNCTION__

  AC_MSG_CHECKING(whether $CC implements __PRETTY_FUNCTION__)

  AC_CACHE_VAL(gst_cv_have_pretty_function,[

    AC_TRY_LINK([#include <stdio.h>],

                [printf("%s", __PRETTY_FUNCTION__);],

                gst_cv_have_pretty_function=yes,

                gst_cv_have_pretty_function=no)

  ])

  AC_MSG_RESULT($gst_cv_have_pretty_function)

  if test "$gst_cv_have_pretty_function" = yes; then

    AC_DEFINE(HAVE_PRETTY_FUNCTION, 1,

              [defined if the compiler implements __PRETTY_FUNCTION__])

  fi

dnl #2: __FUNCTION__

  AC_MSG_CHECKING(whether $CC implements __FUNCTION__)

  AC_CACHE_VAL(gst_cv_have_function,[

    AC_TRY_LINK([#include <stdio.h>],

                [printf("%s", __FUNCTION__);],

                gst_cv_have_function=yes,

                gst_cv_have_function=no)

  ])

  AC_MSG_RESULT($gst_cv_have_function)

  if test "$gst_cv_have_function" = yes; then

    AC_DEFINE(HAVE_FUNCTION, 1,

              [defined if the compiler implements __FUNCTION__])

  fi

dnl #3: __func__

  AC_MSG_CHECKING(whether $CC implements __func__)

  AC_CACHE_VAL(gst_cv_have_func,[

    AC_TRY_LINK([#include <stdio.h>],

                [printf("%s", __func__);],

                gst_cv_have_func=yes,

                gst_cv_have_func=no)

  ])

  AC_MSG_RESULT($gst_cv_have_func)

  if test "$gst_cv_have_func" = yes; then

    AC_DEFINE(HAVE_FUNC, 1,

              [defined if the compiler implements __func__])

  fi

dnl now define FUNCTION to whatever works, and fallback to ""

  if test "$gst_cv_have_pretty_function" = yes; then

    function=__PRETTY_FUNCTION__

  else

    if test "$gst_cv_have_function" = yes; then

      function=__FUNCTION__

    else

      if test "$gst_cv_have_func" = yes; then

        function=__func__

      else

        function=\"\"

      fi

    fi

  fi

  AC_DEFINE_UNQUOTED(GST_FUNCTION, $function, [macro to use to show function name])

])