[project @ 2001-10-26 00:53:27 by sof]
Added support for a custom pre-processor pass: ghc -F -pgmF/path/to/a/pre/processor ... will now run /path/to/a/pre/processor over Haskell input sources. It is positioned in the compilation pipeline just before the compiler proper, but after unlit'ing and CPP'ing. The pre-processor is passed the following command-line when invoked: /path/to/a/pre/processor orig_input_source_file_path input_source_file output_source_file <other options> Additionally options can be fed directly to the pre-processor via -optF<option> options. The -F option causes the pre-processor to run _iff_ one has been specified via -pgmF (there's some redundancy here, but I went for this cmd-line interface as it's consistent with the general -pgm<Foo> story). Motivation: * hooking in a pre-processor is occasionally useful; e.g., cheap&cheerful way to integrate language extensions with GHC, compile-time syntax/style checking etc. * Artfully re-using the CPP phase (by specifying your own via -pgmP) doesn't really work as the driver really assumes that GNU cpp is what's being invoked (and path mangling is also performed on Win32 platforms). Additionally, there are cases when you want to be able to run CPP _and_ a pre-processor. * The alternative of running the pre-processor as a separate program in a Makefile (say) doesn't work in interpreted mode, and this approach also forces you to give up on recompilation checking when in batch mode.
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