Once the binaries target will have proven itself to work well, it will be possible to integrate it for the main directory traversal. That is, do make export; make binaries; make libs; make tools instead of make export; make compile; make libs; make tools. Then, make libs would skip directories that are only linking binaries, since that would be done by the binaries target. One thing to keep in mind, though, is that the binaries target skips nspr, nss, icu and ffi, and that those will need to be recursed when doing such a complete build. This might not be an immediate win with pymake, and might require waiting for more directories to be skipped, though.

I won't touch this stuff in LDFLAGS based on our discussion in bug 973649.

Let's clarify the goal of this bug, because bug 1043862 is going to make it less obvious: The goal here is to make use the fancy stamp-file make-the-build-faster trick for the default build.