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varname-dot-shell.mk revision 1.3 
      1  1.3  rillig # $NetBSD: varname-dot-shell.mk,v 1.3 2020/10/24 08:46:08 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  1.1  rillig ORIG_SHELL:=	${.SHELL}
      9  1.1  rillig 
     10  1.1  rillig .SHELL=		overwritten
     11  1.1  rillig .if ${.SHELL} != ${ORIG_SHELL}
     12  1.3  rillig .  error
     13  1.1  rillig .endif
     14  1.1  rillig 
     15  1.1  rillig # Trying to delete the variable.
     16  1.1  rillig # This has no effect since the variable is not defined in the global context,
     17  1.1  rillig # but in the command-line context.
     18  1.1  rillig .undef .SHELL
     19  1.1  rillig .SHELL=		newly overwritten
     20  1.1  rillig .if ${.SHELL} != ${ORIG_SHELL}
     21  1.3  rillig .  error
     22  1.1  rillig .endif
     23  1.1  rillig 
     24  1.1  rillig all:
     25  1.2  rillig 	@echo ${.SHELL:M*}
     26