[sr #110655] AT&T UnixPC (3b1) shell thrown off by #( after case.

[Alain Knaff]

URL:
  <https://savannah.gnu.org/support/?110655>

                 Summary: AT&T UnixPC (3b1) shell thrown off by #( after case.
                 Project: Autoconf
            Submitted by: alainknaff
            Submitted on: Sun 15 May 2022 07:50:33 PM CEST
                Category: None
                Priority: 5 - Normal
                Severity: 3 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: None

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Details:

On AT&T UnixPC (3b1), autoconf's configure picks the following implementation
for as_echo_n :

    as_echo_n_body='eval
      arg=$1;
      case $arg in #(
      *"$as_nl"*)
        expr "X$arg" : "X\\(.*\\)$as_nl";
        arg=`expr "X$arg" : ".*$as_nl\\(.*\\)"`;;
      esac;
      expr "X$arg" : "X\\(.*\\)" | tr -d "$as_nl"
    '

However, UnixPC's shell apparently does not understand the #( after "case $arg
in", and raises an end of file error.
Simply removing it fixes the problem on AT&T UnixPC.

However, I understand that this might be needed on *other* architectures.

A more portable solution might be to simply not bother handling newlines which
might be embedded with the echoed string, and suppress those as well. Indeed,
I have a strong suspicion that echo -n is not ever used by autoconf for a
string that contains newlines.






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