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export.mk revision 1.5 
      1 # $Id: export.mk,v 1.5 2020/08/08 13:00:07 rillig Exp $
      2 
      3 UT_TEST=export
      4 UT_FOO=foo${BAR}
      5 UT_FU=fubar
      6 UT_ZOO=hoopie
      7 UT_NO=all
      8 # believe it or not, we expect this one to come out with $UT_FU unexpanded.
      9 UT_DOLLAR= This is $$UT_FU
     10 
     11 .export UT_FU UT_FOO
     12 .export UT_DOLLAR
     13 
     14 .if !defined(.MAKE.PID)
     15 .error .MAKE.PID must be defined
     16 .endif
     17 @=	at
     18 %=	percent
     19 *=	asterisk
     20 ${:U!}=	exclamation		# A direct != would try to run "exclamation"
     21 				# as a shell command and assign its output
     22 				# to the empty variable.
     23 &=	ampersand
     24 
     25 # This is ignored because it is internal.
     26 .export .MAKE.PID
     27 # These are ignored because they are local to the target.
     28 .export @
     29 .export %
     30 .export *
     31 .export !
     32 .export &
     33 # This is ignored because it is undefined.
     34 .export UNDEFINED
     35 
     36 BAR=bar is ${UT_FU}
     37 
     38 .MAKE.EXPORTED+= UT_ZOO UT_TEST
     39 
     40 FILTER_CMD?=	egrep -v '^(MAKEFLAGS|PATH|PWD|SHLVL|_)='
     41 
     42 all:
     43 	@env | ${FILTER_CMD} | sort
     44