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opt-debug-lint.mk revision 1.6 
      1 # $NetBSD: opt-debug-lint.mk,v 1.6 2020/09/14 21:52:49 rillig Exp $
      2 #
      3 # Tests for the -dL command line option, which runs additional checks
      4 # to catch common mistakes, such as unclosed variable expressions.
      5  
      6 .MAKEFLAGS: -dL
      7 
      8 # Since 2020-09-13, undefined variables that are used on the left-hand side
      9 # of a condition at parse time get a proper error message.  Before, the
     10 # error message was "Malformed conditional" only, which was wrong and
     11 # misleading.  The form of the condition is totally fine, it's the evaluation
     12 # that fails.
     13 #
     14 # Since 2020-09-13, the "Malformed conditional" error message is not printed
     15 # anymore.
     16 #
     17 # See also:
     18 #	cond-undef-lint.mk
     19 .if $X
     20 .  error
     21 .endif
     22 
     23 # The dynamic variables like .TARGET are treated specially.  It does not make
     24 # sense to expand them in the global scope since they will never be defined
     25 # there under normal circumstances.  Therefore they expand to a string that
     26 # will later be expanded correctly, when the variable is evaluated again in
     27 # the scope of an actual target.
     28 #
     29 # Even though the "@" variable is not defined at this point, this is not an
     30 # error.  In all practical cases, this is no problem.  This particular test
     31 # case is made up and unrealistic.
     32 .if $@ != "\$(.TARGET)"
     33 .  error
     34 .endif
     35 
     36 # Since 2020-09-13, Var_Parse properly reports errors for undefined variables,
     37 # but only in lint mode.  Before, it had only silently returned var_Error,
     38 # hoping for the caller to print an error message.  This resulted in the
     39 # well-known "Malformed conditional" error message, even though the
     40 # conditional was well-formed and the only error was an undefined variable.
     41 .if ${UNDEF}
     42 .  error
     43 .endif
     44 
     45 # Since 2020-09-14, dependency lines may contain undefined variables.
     46 # Before, undefined variables were forbidden, but this distinction was not
     47 # observable from the outside of the function Var_Parse.
     48 ${UNDEF}: ${UNDEF}
     49 
     50 # In a condition that has a defined(UNDEF) guard, all guarded conditions
     51 # may assume that the variable is defined since they will only be evaluated
     52 # if the variable is indeed defined.  Otherwise they are only parsed, and
     53 # for parsing it doesn't make a difference whether the variable is defined
     54 # or not.
     55 #
     56 # FIXME: As of 2020-09-14, the following line prints an error message saying
     57 # that UNDEF is undefined.
     58 .if defined(UNDEF) && exists(${UNDEF})
     59 .  error
     60 .endif
     61 
     62 all:
     63 	@:;
     64