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rustc: Don't create empty codegen units
This'll end up just creating a bunch of object files that otherwise wouldn't exist, so skip that extra work if possible.
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@ -1178,9 +1178,6 @@ fn collect_and_partition_translation_items<'a, 'tcx>(
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.collect::<Vec<_>>()
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});
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assert!(tcx.sess.opts.codegen_units == codegen_units.len() ||
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tcx.sess.opts.debugging_opts.incremental.is_some());
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let translation_items: DefIdSet = items.iter().filter_map(|trans_item| {
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match *trans_item {
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TransItem::Fn(ref instance) => Some(instance.def_id()),
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@ -407,15 +407,6 @@ fn merge_codegen_units<'tcx>(initial_partitioning: &mut PreInliningPartitioning<
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for (index, cgu) in codegen_units.iter_mut().enumerate() {
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cgu.set_name(numbered_codegen_unit_name(crate_name, index));
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}
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// If the initial partitioning contained less than target_cgu_count to begin
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// with, we won't have enough codegen units here, so add a empty units until
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// we reach the target count
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while codegen_units.len() < target_cgu_count {
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let index = codegen_units.len();
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let name = numbered_codegen_unit_name(crate_name, index);
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codegen_units.push(CodegenUnit::new(name));
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}
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}
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fn place_inlined_translation_items<'tcx>(initial_partitioning: PreInliningPartitioning<'tcx>,
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