is this a bug or intended behavior

[Samuel Klatchko]

I have the following Makefile:

        foo: bar
                @echo While building $@ MACRO = ${MACRO}

        foo: MACRO += foo_specific

        bar:
                @echo While building $@ MACRO = ${MACRO}

        bar: MACRO += bar_specific

        MACRO = common

I would expect to get the output:

        While building bar MACRO = common bar_specific
        While building foo MACRO = common foo_specific

but instead I get:

        While building bar MACRO = common foo_specific bar_specific
        While building foo MACRO = common foo_specific

Is this a bug or am I misunderstanding how target specific variables
work.

The real use case is when I have a Makefile that is building both an
shared object and an executable that uses it.  I want to factor LDLIBS
into common libraries that both use and specific libraries that are only
for the shared object or the executable.  But due to this behavior, I
can't have the executable dependent on the shared object.

Thanks,
samuel
--
R Samuel Klatchko
Software Architect
Messaging and Web Security
Symantec Corporation
www.symantec.com
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