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    <p>Although there where some suggestions on how to do what I initially asked for <a href="https://stackoverflow.com/questions/3236145/force-gnu-make-to-rebuild-objects-affected-by-compiler-definition/3237349#3237349">here</a> (as pointed to by <a href="https://stackoverflow.com/users/371234/slowdog">slowdog</a>), I took the decision to take <a href="https://stackoverflow.com/users/128940/beta">Beta</a>'s different-names-schema one step further and put all objects for the various variants in subdirectories following the description in <a href="https://stackoverflow.com/users/128940/beta">Beta</a>'s second suggestion in his answer to <a href="https://stackoverflow.com/questions/2597462/vpath-in-makefile-issue">this question</a>.</p> <p>In essence that made my Makefile look like:</p> <pre><code>A : AOBJDIR = .a AOBJECTS = $(addprefix $(AOBJDIR)/,$(ASRCS:.c=.o)) $(AOBJECTS): $(AOBJDIR)/%o: %.c $(CC) $(CFLAGS) -MMD -o $@ -c $&lt; $(AOBJDIR) : @mkdir $(AOBJDIR) -include $(AOBJECTS:.o=.d) a: $(AOBJDIR) $(AOBJECTS) $(LINK) ... </code></pre> <p>So the first part names a subdirectory to be used for object files of 'a' and creates a list of object files in that directory by converting the source filenames and adding the subdirectory prefix.</p> <p>Then follows the default rule for those object files (with dependency generation thrown in for good measure).</p> <p>Next two are ensuring that the subdirectory exists, and that the dependency information is included.</p> <p>Finally the link rule with an extra dependency on the subdirectory itself to ensure that it is created if it does not exist.</p> <p>This block can be repeated for b, in my example, by exchanging all a's. So if I only could figure out how to package this block into something more general that can be parameterized I would be happy.</p>
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