[bug #25140] Pattern-specific variable assignment behaves differently compared to normal variables

[Boris Kolpackov]

URL:
  <http://savannah.gnu.org/bugs/?25140>

                 Summary: Pattern-specific variable assignment behaves
differently compared to normal variables
                 Project: make
            Submitted by: bosk
            Submitted on: Sun 21 Dec 2008 10:20:54 AM GMT
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 3.81
        Operating System: Any
           Fixed Release: None

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Details:

Consider this makefile:

v := two

%.bar: var := one
%.bar: var += $(v)
%.bar: var += three

v :=

%.bar: ; @echo $(var)

all: foo.bar

When used with 3.81, it prints 'one three' while I would expect it to print
'one two three'. If I change pattern-specific to target-specific assignment,
it works as expected:

foo.bar: var := one
foo.bar: var += $(v)
foo.bar: var += three

The workaround for this problem is to use temporary variable:

tmp := one
tmp += $(v)
tmp += three

%.bar: var := $(tmp)





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