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Read multiple top-level source
files, generate single assembler file.
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Equivalent to multiple compiles plus linking
resulting object files.
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Speeds up compilation, enables inter-module optimizations.
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Needs to re-initialize front-end for each source file,
without re-initializing back-end.
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Both
gcc and cc1 changes.
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Mostly works, but some issues remain, such as renaming statics.
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gcj has supported this mode for a while in an ad hoc manner.