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cond-short.mk revision 1.4 
      1  1.4  rillig # $NetBSD: cond-short.mk,v 1.4 2020/07/02 12:37:18 rillig Exp $
      2  1.1  rillig #
      3  1.1  rillig # Demonstrates that in conditions, the right-hand side of an && or ||
      4  1.2  rillig # is only evaluated if it can actually influence the result.
      5  1.1  rillig #
      6  1.2  rillig # Between 2015-10-11 and 2020-06-28, the right-hand side of an && or ||
      7  1.2  rillig # operator was always evaluated, which was wrong.
      8  1.1  rillig #
      9  1.2  rillig 
     10  1.2  rillig # The && operator.
     11  1.1  rillig 
     12  1.1  rillig .if 0 && ${echo "unexpected and" 1>&2 :L:sh}
     13  1.1  rillig .endif
     14  1.1  rillig 
     15  1.1  rillig .if 1 && ${echo "expected and" 1>&2 :L:sh}
     16  1.1  rillig .endif
     17  1.1  rillig 
     18  1.2  rillig .if 0 && exists(nonexistent${echo "unexpected and exists" 1>&2 :L:sh})
     19  1.2  rillig .endif
     20  1.2  rillig 
     21  1.2  rillig .if 1 && exists(nonexistent${echo "expected and exists" 1>&2 :L:sh})
     22  1.2  rillig .endif
     23  1.2  rillig 
     24  1.2  rillig .if 0 && empty(${echo "unexpected and empty" 1>&2 :L:sh})
     25  1.2  rillig .endif
     26  1.2  rillig 
     27  1.2  rillig .if 1 && empty(${echo "expected and empty" 1>&2 :L:sh})
     28  1.2  rillig .endif
     29  1.2  rillig 
     30  1.4  rillig # "VAR U11" is not evaluated; it was evaluated before 2020-07-02.
     31  1.4  rillig # The whole !empty condition is only parsed and then discarded.
     32  1.3  rillig VAR=	${VAR${:U11${echo "unexpected VAR U11" 1>&2 :L:sh}}}
     33  1.3  rillig VAR13=	${VAR${:U12${echo "unexpected VAR13" 1>&2 :L:sh}}}
     34  1.3  rillig .if 0 && !empty(VAR${:U13${echo "unexpected U13 condition" 1>&2 :L:sh}})
     35  1.3  rillig .endif
     36  1.3  rillig 
     37  1.3  rillig VAR=	${VAR${:U21${echo "unexpected VAR U21" 1>&2 :L:sh}}}
     38  1.3  rillig VAR23=	${VAR${:U22${echo   "expected VAR23" 1>&2 :L:sh}}}
     39  1.3  rillig .if 1 && !empty(VAR${:U23${echo   "expected U23 condition" 1>&2 :L:sh}})
     40  1.3  rillig .endif
     41  1.3  rillig 
     42  1.4  rillig # FIXME: The :M modifier must only be parsed, not evaluated.
     43  1.4  rillig .if 0 && !empty(VAR:M${:U${echo "unexpected M pattern" 1>&2 :L:sh}})
     44  1.4  rillig .endif
     45  1.4  rillig 
     46  1.2  rillig # The || operator.
     47  1.2  rillig 
     48  1.1  rillig .if 1 || ${echo "unexpected or" 1>&2 :L:sh}
     49  1.1  rillig .endif
     50  1.1  rillig 
     51  1.1  rillig .if 0 || ${echo "expected or" 1>&2 :L:sh}
     52  1.1  rillig .endif
     53  1.1  rillig 
     54  1.2  rillig .if 1 || exists(nonexistent${echo "unexpected or exists" 1>&2 :L:sh})
     55  1.2  rillig .endif
     56  1.2  rillig 
     57  1.2  rillig .if 0 || exists(nonexistent${echo "expected or exists" 1>&2 :L:sh})
     58  1.2  rillig .endif
     59  1.2  rillig 
     60  1.2  rillig .if 1 || empty(${echo "unexpected or empty" 1>&2 :L:sh})
     61  1.2  rillig .endif
     62  1.2  rillig 
     63  1.2  rillig .if 0 || empty(${echo "expected or empty" 1>&2 :L:sh})
     64  1.2  rillig .endif
     65  1.2  rillig 
     66  1.2  rillig # Unreachable nested conditions are skipped completely as well.
     67  1.1  rillig 
     68  1.1  rillig .if 0
     69  1.1  rillig .  if ${echo "unexpected nested and" 1>&2 :L:sh}
     70  1.1  rillig .  endif
     71  1.1  rillig .endif
     72  1.1  rillig 
     73  1.1  rillig .if 1
     74  1.1  rillig .elif ${echo "unexpected nested or" 1>&2 :L:sh}
     75  1.1  rillig .endif
     76  1.1  rillig 
     77  1.1  rillig all:
     78  1.1  rillig 	@:;:
     79