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      1 # $NetBSD: varname-dot-make-level.mk,v 1.6 2025/03/22 12:23:00 rillig Exp $
      2 #
      3 # Tests for the special .MAKE.LEVEL variable, which informs about the
      4 # recursion level.  It is related to the environment variable MAKELEVEL,
      5 # even though they don't have the same value.
      6 
      7 all: .PHONY level_1 set-env-same set-env-different
      8 
      9 # expect: level 1: variable 0, env 1
     10 level_1: .PHONY
     11 	@printf 'level 1: variable %s, env %s\n' ${.MAKE.LEVEL} "$$${.MAKE.LEVEL.ENV}"
     12 	@${MAKE} -f ${MAKEFILE} level_2
     13 
     14 # expect: level 2: variable 1, env 2
     15 level_2: .PHONY
     16 	@printf 'level 2: variable %s, env %s\n' ${.MAKE.LEVEL} "$$${.MAKE.LEVEL.ENV}"
     17 	@${MAKE} -f ${MAKEFILE} level_3
     18 
     19 # The .unexport-env directive clears the environment, except for the
     20 # .MAKE.LEVEL.ENV make variable, which by default refers to the MAKELEVEL
     21 # environment variable.
     22 .if make(level_2)
     23 .unexport-env
     24 .endif
     25 
     26 # expect: level 3: variable 2, env 3
     27 level_3: .PHONY
     28 	@printf 'level 3: variable %s, env %s\n' ${.MAKE.LEVEL} "$$${.MAKE.LEVEL.ENV}"
     29 
     30 
     31 # When a variable assignment from the command line tries to override a
     32 # read-only global variable with the same value as before, ignore the
     33 # assignment, as the variable value would not change.
     34 #
     35 # This special case allows older versions of make to coexist with newer
     36 # versions of make. Older version of make (up to NetBSD 9) stored the internal
     37 # .MAKE.LEVEL.ENV variable in the scope for command line variables, and these
     38 # variables were passed to sub-makes via .MAKEOVERRIDES and the MAKEFLAGS
     39 # environment variable. Newer versions of make (since NetBSD 11) store the
     40 # internal .MAKE.LEVEL.ENV variable in the global scope but make it read-only
     41 # and prevent any attempts to override it.
     42 #
     43 # https://gnats.netbsd.org/59184
     44 set-env-same: .PHONY
     45 	: ${.TARGET}
     46 	@${MAKE} -f ${MAKEFILE} ok .MAKE.LEVEL.ENV=${.MAKE.LEVEL.ENV} || echo "${.TARGET}: exit $$?"
     47 
     48 
     49 # expect: make: Cannot override read-only global variable ".MAKE.LEVEL.ENV" with a command line variable
     50 set-env-different: .PHONY
     51 	: ${.TARGET}
     52 	@${MAKE} -f ${MAKEFILE} ok .MAKE.LEVEL.ENV=CUSTOM || echo "${.TARGET}: exit $$?"
     53 
     54 ok: .PHONY
     55 	@echo ok
     56