[Bug 4243] New: hush parsing of ${1+"$@"}

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4243

           Summary: hush parsing of ${1+"$@"}
           Product: Busybox
           Version: 1.19.x
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Standard Compliance
        AssignedTo: unassigned at busybox.net
        ReportedBy: christian.haggstrom at intel.com
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


Created attachment 3613
  --> https://bugs.busybox.net/attachment.cgi?id=3613
adds test for ${1+"$@"}

We have some shell scripts that needs to be compatible among many shells, and
we use ${1+"$@"} instead of "$@" in some wrapper script for the reasons
described here:
http://www.gnu.org/s/hello/manual/autoconf/Shell-Substitutions.html

Now, busybox ash and hush both interpret it differenly than bash. I tried with
the git HEAD.

$ echo 'for x in ${1+"$@"}; do echo $x; done' > testscript
$ ./hush testscript "a b"
"a
b"
$ bash testscript "a b"
a b

$ ./hush -v
BusyBox v1.20.0.git (2011-09-23 11:11:24 CEST) multi-call binary.

I haven't been able to find what the POSIX standard says about ${1+"$@"}, so
please close the bug report if you believe it is non-standard behaviour.

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