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Simon Marlow authored
This forces preprocessing to happen, which is necessary if any of the .hsc files have been modified. Without this change, a 'setup makefile' would be required by hand after a .hsc file changed. Fortunately 'setup makefile' isn't much extra work, and I've made it not overwrite GNUmakefile if it hasn't changed, which avoids recalculating the dependencies each time.
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