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varmod-shell.mk revision 1.6 
      1 # $NetBSD: varmod-shell.mk,v 1.6 2021/02/14 20:16:17 rillig Exp $
      2 #
      3 # Tests for the ':!cmd!' variable modifier, which runs the shell command
      4 # given by the variable modifier and returns its output.
      5 #
      6 # This modifier has been added on 2000-04-29.
      7 #
      8 # See also:
      9 #	ApplyModifier_ShellCommand
     10 
     11 # The command to be run is enclosed between exclamation marks.
     12 # The previous value of the expression is irrelevant for this modifier.
     13 # The :!cmd! modifier turns an undefined expression into a defined one.
     14 .if ${:!echo word!} != "word"
     15 .  error
     16 .endif
     17 
     18 # If the command exits with non-zero, an error message is printed.
     19 # XXX: Processing continues as usual though.
     20 #
     21 # Between 2000-04-29 and 2020-11-17, the error message mentioned the previous
     22 # value of the expression (which is usually an empty string) instead of the
     23 # command that was executed.  It's strange that such a simple bug could
     24 # survive such a long time.
     25 .if ${:!echo word; false!} != "word"
     26 .  error
     27 .endif
     28 .if ${:Uprevious value:!echo word; false!} != "word"
     29 .  error
     30 .endif
     31 
     32 all:
     33