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- ``incremental``
- Compiles each Swift source in the module separately, resulting in better
- parallelism in the build. The compiler emits additional information into
- the build directory improving rebuild performance when small changes are made
- to the source between rebuilds. This is the best option to use while
- iterating on changes in a project.
- ``wholemodule``
- Whole-module optimizations are slowest to compile, but results in the most
- optimized library. The entire context is loaded into once instance of the
- compiler, so there is no parallelism across source files in the module.
- ``singlefile``
- Compiles each source in a Swift modules separately, resulting in better
- parallelism. Unlike the ``incremental`` build mode, no additional information
- is emitted by the compiler during the build, so rebuilding after making small
- changes to the source file will not run faster. This option should be used
- sparingly, preferring ``incremental`` builds, unless working around a compiler
- bug.
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