[Bug 217553] [patch] awk(1) assignment arguments do not accept values with a leading '='

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217553

            Bug ID: 217553
           Summary: [patch] awk(1) assignment arguments do not accept
                    values with a leading '='
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kdrakehp at zoho.com
          Keywords: patch

Created attachment 180522
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180522&action=edit
Remove the second '=' check in `isclvar'.

awk(1) explicitly disallows command-line assignments where the
assignment value has a leading '='.  This behavior is contrary to the
standard, which places no such restriction on assignment values.

>From the standard:
        The characters following the <equals-sign> shall be interpreted
        as if they appeared in the awk program preceded and followed by
        a double-quote ('"') character, as a STRING token (see Grammar),
        except that if the last character is an unescaped <backslash>,
        it shall be interpreted as a literal <backslash> rather than as
        the first character of the sequence "\"".


How to reproduce:

        $ awk 'END{print var}' var='=value=' < /dev/null
        awk: can't open file var==value=
         source line number 1

Expected output:
        =value=


        $ awk -v var='=value=' 'BEGIN{print var}'
        awk: invalid -v option argument: var== text

Expected output:
        =value=

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