bmake: unit-tests/varmod-shell.mk - 20201101 vs. 20201117 changes

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About: bmake a BSD make tool (derived from NetBSD’s make).

varmod-shell.mk (bmake-20201101)	:	varmod-shell.mk (bmake-20201117)

# $NetBSD: varmod-shell.mk,v 1.2 2020/08/16 14:25:16 rillig Exp $		# $NetBSD: varmod-shell.mk,v 1.5 2020/11/17 20:11:02 rillig Exp $
#		#
# Tests for the :sh variable modifier, which runs the shell command		# Tests for the :sh variable modifier, which runs the shell command
# given by the variable value and returns its output.		# given by the variable value and returns its output.

		#
		# This modifier has been added on 2000-04-29.
		#
		# See also:
		# ApplyModifier_ShellCommand

# TODO: Implementation		# TODO: Implementation


		# The command to be run is enclosed between exclamation marks.
		# The previous value of the expression is irrelevant for this modifier.
		# The :!cmd! modifier turns an undefined expression into a defined one.
		.if ${:!echo word!} != "word"
		. error
		.endif

		# If the command exits with non-zero, an error message is printed.
		# XXX: Processing continues as usual though.
		#
		# Between 2000-04-29 and 2020-11-17, the error message mentioned the previous
		# value of the expression (which is usually an empty string) instead of the
		# command that was executed. It's strange that such a simple bug could
		# survive such a long time.
		.if ${:!echo word; false!} != "word"
		. error
		.endif
		.if ${:Uprevious value:!echo word; false!} != "word"
		. error
		.endif

all:		all:
@:;		@:;

End of changes. 3 change blocks.
1 lines changed or deleted		27 lines changed or added