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dnl modified AC_C_INLINE from autoconf/c.m4

AN_IDENTIFIER([attribute], [AC_C_ATTRIBUTE])

AC_DEFUN([AC_C_ATTRIBUTE],

[AC_CACHE_CHECK([for __attribute__], ac_cv_c_attribute,

[

AC_COMPILE_IFELSE([AC_LANG_SOURCE(

[void foo(void) __attribute__ ((__noreturn__));]

)],

[ac_cv_c_attribute=yes],

[ac_cv_c_attribute=no]

)

])

AH_VERBATIM([attribute],

[/* Define to `__attribute__' to nothing if it's not supported.  */

#undef __attribute__])

case $ac_cv_c_attribute in

  yes) ;;

  no)

    cat >>confdefs.h <<_ACEOF

#define __attribute__(x)    /* nothing */

_ACEOF

    ;;

esac

])# AC_C_ATTRIBUTE