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varmod-shell.mk revision 1.11 
      1 # $NetBSD: varmod-shell.mk,v 1.11 2024/08/29 20:20:37 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 # expect+1: warning: Command "echo word; (exit 13)" exited with status 13
     25 .if ${:!echo word; (exit 13)!} != "word"
     26 .  error
     27 .endif
     28 # expect+1: warning: Command "echo word; (exit 13)" exited with status 13
     29 .if ${:Uprevious value:!echo word; (exit 13)!} != "word"
     30 .  error
     31 .endif
     32 
     33 
     34 .MAKEFLAGS: -dv			# to see the "Capturing" debug output
     35 # expect+1: warning: Command "echo word; (exit 13)" exited with status 13
     36 _:=	${:!echo word; ${:U(exit 13)}!}
     37 .MAKEFLAGS: -d0
     38 
     39 
     40 all:
     41