ax_check_awk_errno

Check if AWK supports ERRNO variable. If successful execute ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE.

This work is heavily based upon testawk.sh script by Heiner Steven. You should find his script (and related works) at <http://www.shelldorado.com/articles/awkcompat.html>. Thanks to Alessandro Massignan for his suggestions and extensive nawk tests on FreeBSD.

AC_DEFUN([AX_CHECK_AWK_ERRNO], [
  AX_TRY_AWK_EXPOUT([ERRNO],
    [],[ getline s < "./this_file_should_not_exist"; if ( !ERRNO ) exit (1) ],[],
    [$1],[$2])
])

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