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varmod-shell.mk revision 1.4 
      1 # $NetBSD: varmod-shell.mk,v 1.4 2020/11/17 20:08:09 rillig Exp $
      2 #
      3 # Tests for the :sh variable modifier, which runs the shell command
      4 # given by the variable value and returns its output.
      5 #
      6 # This modifier has been added on 2000-04-29.
      7 #
      8 # See also:
      9 #	ApplyModifier_ShellCommand
     10 
     11 # TODO: Implementation
     12 
     13 # The command to be run is enclosed between exclamation marks.
     14 # The previous value of the expression is irrelevant for this modifier.
     15 # The :!cmd! modifier turns an undefined expression into a defined one.
     16 .if ${:!echo word!} != "word"
     17 .  error
     18 .endif
     19 
     20 # If the command exits with non-zero, an error message is printed.
     21 # XXX: Processing continues as usual though.
     22 #
     23 # Since 2000-04-29, the error message mentions the previous
     24 # value of the expression (which is usually an empty string) instead of the
     25 # command that was executed.  It's strange that such a simple bug could
     26 # survive such a long time.
     27 .if ${:!echo word; false!} != "word"
     28 .  error
     29 .endif
     30 .if ${:Uprevious value:!echo word; false!} != "word"
     31 .  error
     32 .endif
     33 
     34 all:
     35 	@:;
     36