src/usr.bin/make/unit-tests/var-op-expand.mk - diff

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-version 1.5, 2020/12/27 20:45:52
+version 1.6, 2020/12/27 21:19:13
 Line 86  UNDEF=  Uwas undefined
 Line 86  UNDEF=  Uwas undefined
 Line 86  UNDEF=  Uwas undefined
  .endif
+ # In variable assignments using the ':=' operator, undefined variables are
+ # preserved, no matter how indirectly they are referenced.
+ .undef REF3
+ REF2=           <${REF3}>
+ REF=            ${REF2}
+ VAR:=           ${REF}
+ REF3=           too late
+ .if ${VAR} != "<too late>"
+ .  error
+ .endif
+ # In variable assignments using the ':=' operator, '$$' are preserved, no
+ # matter how indirectly they are referenced.
+ REF2=           REF2:$$ $$$$
+ REF=            REF:$$ $$$$ ${REF2}
+ VAR:=           VAR:$$ $$$$ ${REF}
+ .if ${VAR} != "VAR:\$ \$\$ REF:\$ \$\$ REF2:\$ \$\$"
+ .  error
+ .endif
+ # In variable assignments using the ':=' operator, '$$' are preserved in the
+ # expressions of the top level, but not in expressions that are nested.
+ VAR:=           top:$$ ${:Unest1\:\$\$} ${:Unest2${:U\:\$\$}}
+ .if ${VAR} != "top:\$ nest1:\$ nest2:\$"
+ .  error
+ .endif
  # XXX: edge case: When a variable name refers to an undefined variable, the
  # behavior differs between the '=' and the ':=' assignment operators.
  # This bug exists since var.c 1.42 from 2000-05-11.