Re: POSIXLY_CORRECT not correctly unset in getopt.m4?

[Paolo Bonzini]

On 09/07/2010 10:39 PM, Eric Blake wrote:

        gl_awk_probe='BEGIN { for (v in ENVIRON)
          if (v == "POSIXLY_CORRECT") print "x" }'
        case ${POSIXLY_CORRECT:+x}`awk "$gl_awk_probe" </dev/null` in
          xx) gl_had_POSIXLY_CORRECT=exported ;;
          x)  gl_had_POSIXLY_CORRECT=yes      ;;
          *)  gl_had_POSIXLY_CORRECT=         ;;
        esac

Walking all of ENVIRON seems slow.  What about

       gl_awk_probe='BEGIN {print !!length(ENVIRON["POSIXLY_CORRECT"])}'
       case ${POSIXLY_CORRECT:+x}`awk "$gl_awk_probe" </dev/null` in
         x1) gl_had_POSIXLY_CORRECT=exported ;;
         x0) gl_had_POSIXLY_CORRECT=yes      ;;
         *)  gl_had_POSIXLY_CORRECT=         ;;
       esac

instead?

Paolo