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Add support for generating bytecode objects

Matthew Pickering requested to merge wip/gdc-files into master

This commit adds the -fwrite-byte-code option which makes GHC emit a .gbc file which contains a serialised representation of bytecode.

The bytecode can be loaded by the compiler to avoid having to reinterpret a module when using the bytecode interpreter (for example, in GHCi).

There are also the new options:

  • -gbcdir=: Specify the directory to place the gbc files
  • -gbcsuf=: Specify the suffix for gbc files

The option -fbyte-code-and-object-code now implies -fwrite-byte-code.

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