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      1  1.7  rillig # $NetBSD: varname-dot-shell.mk,v 1.7 2021/02/04 21:42:47 rillig Exp $
      2  1.1  rillig #
      3  1.1  rillig # Tests for the special .SHELL variable, which contains the shell used for
      4  1.1  rillig # running the commands.
      5  1.1  rillig #
      6  1.1  rillig # This variable is read-only.
      7  1.1  rillig 
      8  1.4  rillig .MAKEFLAGS: -dcpv
      9  1.4  rillig 
     10  1.1  rillig ORIG_SHELL:=	${.SHELL}
     11  1.1  rillig 
     12  1.1  rillig .SHELL=		overwritten
     13  1.1  rillig .if ${.SHELL} != ${ORIG_SHELL}
     14  1.3  rillig .  error
     15  1.1  rillig .endif
     16  1.1  rillig 
     17  1.5  rillig # Trying to append to the variable.
     18  1.6  rillig # Since 2020-10-30 this is prevented.
     19  1.5  rillig .MAKEFLAGS: .SHELL+=appended
     20  1.6  rillig .if ${.SHELL} != ${ORIG_SHELL}
     21  1.5  rillig .  error
     22  1.5  rillig .endif
     23  1.5  rillig 
     24  1.1  rillig # Trying to delete the variable.
     25  1.7  rillig # This has no effect since the variable is not defined in the global scope,
     26  1.7  rillig # but in the command-line scope.
     27  1.1  rillig .undef .SHELL
     28  1.1  rillig .SHELL=		newly overwritten
     29  1.6  rillig .if ${.SHELL} != ${ORIG_SHELL}
     30  1.3  rillig .  error
     31  1.1  rillig .endif
     32  1.1  rillig 
     33  1.4  rillig .MAKEFLAGS: -d0
     34  1.4  rillig 
     35  1.1  rillig all:
     36  1.4  rillig 	@:;
     37