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varmod-shell.mk revision 1.7 
      1 # $NetBSD: varmod-shell.mk,v 1.7 2022/01/10 20:32:29 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.
     24 .if ${:!echo word; false!} != "word"
     25 .  error
     26 .endif
     27 .if ${:Uprevious value:!echo word; false!} != "word"
     28 .  error
     29 .endif
     30 
     31 
     32 .MAKEFLAGS: -dv			# to see the actual command
     33 _:=	${:!echo word; ${:Ufalse}!}
     34 .MAKEFLAGS: -d0
     35 
     36 all:
     37