Re: Failure running gnulib-tool update on z/OS

[Paul Eggert]

On 5/30/22 20:55, Mike Fulton wrote:
> /bin/sh gnulib/gnulib-tool –update
>
> The error is on line 1571, where the z/OS shell (an older POSIX ‘sh’) issues:
> FSUM7728 bad ${} modifier

I must be missing context, as current gnulib/gnulib-tool's line 1571 
says "autoconf_minversion=" which doesn't have anything to do with ${} 
modifiers. And although I do see the following code starting on line 
1966, I don't see how the failure occurs because the funny ${} modifier 
is inside a single-quoted string that should not be eval'ed.

Is the problem that the z/OS shell accepts ${f//o/e} but rejects 
${1//[!a-zA-Z0-9_]/_}? If so, the fix to gnulib-tool should be simple.

-----
    if (f=foo; eval echo '${f//o/e}') < /dev/null 2>/dev/null | grep 
fee >/dev/null; then
      # Bash 2.0 and newer, ksh, and zsh support the syntax
      #   ${param//pattern/replacement}
      # as a shorthand for
      #   `echo "$param" | sed -e "s/pattern/replacement/g"`.
      # Note: The 'eval' is necessary for dash and NetBSD /bin/sh.
      eval 'func_cache_var ()
      {
        cachevar=c_${1//[!a-zA-Z0-9_]/_}
      }'
    else
      func_cache_var ()
      {
        case $1 in
          *[!a-zA-Z0-9_]*)
            cachevar=c_`echo "$1" | LC_ALL=C sed -e 
's/[^a-zA-Z0-9_]/_/g'` ;;
          *)
            cachevar=c_$1 ;;
        esac
      }
    fi