We now have various flags that need to be passed to gcc, but only if the local gcc version supports them. So instead of wiring this knowledge into ghc when it is built, we now put these "extra gcc flags" into a text file in $libdir, extra-gcc-flags, which is created by configure. It is also created by the configure script of a binary distribution, so a binary dist is independent of the gcc version used to build it. Hopefully I got the binary-dist stuff right, but binary dists aren't currently working so we'll need to come back and check this.
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