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      1 # $NetBSD: varname-dot-shell.mk,v 1.7 2021/02/04 21:42:47 rillig Exp $
      2 #
      3 # Tests for the special .SHELL variable, which contains the shell used for
      4 # running the commands.
      5 #
      6 # This variable is read-only.
      7 
      8 .MAKEFLAGS: -dcpv
      9 
     10 ORIG_SHELL:=	${.SHELL}
     11 
     12 .SHELL=		overwritten
     13 .if ${.SHELL} != ${ORIG_SHELL}
     14 .  error
     15 .endif
     16 
     17 # Trying to append to the variable.
     18 # Since 2020-10-30 this is prevented.
     19 .MAKEFLAGS: .SHELL+=appended
     20 .if ${.SHELL} != ${ORIG_SHELL}
     21 .  error
     22 .endif
     23 
     24 # Trying to delete the variable.
     25 # This has no effect since the variable is not defined in the global scope,
     26 # but in the command-line scope.
     27 .undef .SHELL
     28 .SHELL=		newly overwritten
     29 .if ${.SHELL} != ${ORIG_SHELL}
     30 .  error
     31 .endif
     32 
     33 .MAKEFLAGS: -d0
     34 
     35 all:
     36 	@:;
     37