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directive-export-gmake.mk revision 1.4 
      1 # $NetBSD: directive-export-gmake.mk,v 1.4 2023/08/19 10:33:32 rillig Exp $
      2 #
      3 # Tests for the export directive (without leading dot), as in GNU make.
      4 
      5 # The "export" directive only affects the environment of the make process
      6 # and its child processes.  It does not affect the global variables or any
      7 # other variables.
      8 VAR=	before
      9 export VAR=exported
     10 .if ${VAR} != "before"
     11 .  error
     12 .endif
     13 
     14 # Ensure that the name-value pair is actually exported.
     15 .if ${:!echo "\$VAR"!} != "exported"
     16 .  error
     17 .endif
     18 
     19 # This line looks like it would export 2 variables, but it doesn't.
     20 # It only exports VAR and appends everything else as the variable value.
     21 export VAR=exported VAR2=exported-as-well
     22 .if ${:!echo "\$VAR"!} != "exported VAR2=exported-as-well"
     23 .  error ${:!echo "\$VAR"!}
     24 .endif
     25 
     26 # Contrary to the usual variable assignments, spaces are significant
     27 # after the '=' sign and are prepended to the value of the environment
     28 # variable.
     29 export VAR=  leading spaces
     30 .if ${:!echo "\$VAR"!} != "  leading spaces"
     31 .  error
     32 .endif
     33 
     34 # Contrary to the usual variable assignments, spaces are significant
     35 # before the '=' sign and are appended to the name of the environment
     36 # variable.
     37 #
     38 # Depending on the shell, environment variables with such exotic names
     39 # may be silently discarded.  One such shell is dash, which is the default
     40 # shell on Ubuntu and Debian.
     41 export VAR =trailing space in varname
     42 .if ${:!env | grep trailing || true!} != "VAR =trailing space in varname"
     43 .  if ${:!env | grep trailing || true!} != "" # for dash
     44 .    error
     45 .  endif
     46 .endif
     47 
     48 # The right-hand side of the exported variable is expanded exactly once.
     49 TWICE=	expanded twice
     50 ONCE=	expanded once, leaving $${TWICE} as-is
     51 export VAR=${ONCE}
     52 .if ${:!echo "\$VAR"!} != "expanded once, leaving \${TWICE} as-is"
     53 .  error
     54 .endif
     55 
     56 # Undefined variables are allowed on the right-hand side, they expand
     57 # to an empty string, as usual.
     58 export VAR=an ${UNDEF} variable
     59 .if ${:!echo "\$VAR"!} != "an  variable"
     60 .  error
     61 .endif
     62 
     63 
     64 # The body of the .for loop expands to 'export VAR=${:U1}', and the 'export'
     65 # directive is only recognized if the line does not contain a ':', to allow
     66 # 'export' to be a regular target.
     67 .for value in 1
     68 # FIXME: The below error message is missing all details.  But even if it
     69 # contained the text of the line, it would be confusing because at the point
     70 # where that error message is printed, all expressions from the line have
     71 # already been expanded as part of the dependency line parsing, which in this
     72 # case hides the ':' from the error message.
     73 # expect+1: Invalid line type
     74 export VAR=${value}
     75 .endfor
     76