[bug #14927] Fix for building archive members in parallel

[Paul D. Smith]

Follow-up Comment #10, bug #14927 (project make):

The real question is, should we modify the default rules to allow parallel
archive builds to work out of the box?  Or should we just make it possible for
users to rewrite the rules to allow it if they want to?

In order to allow it by default we'd have to violate POSIX requirements, which
say that the rules for building archives are:

.c.a:
        $(CC) -c $(CFLAGS) $<
        $(AR) $(ARFLAGS) $@ $*.o
        rm -f $*.o

which is what GNU make uses (basically) and is clearly incompatible with
parallel builds.  And, if we do update the default rules, should we put them
back of .POSIX: is given?


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