Bug 217553

Created attachment 180522 [details]
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=