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This change revisits https://reviews.llvm.org/D79248 which originally added support for the --unresolved-symbols flag. At the time I thought it would make sense to add a third option to this flag called `import-functions` but it turns out (as was suspects by on the reviewers IIRC) that this option can be authoganal. Instead I've added a new option called `--import-undefined` that only operates on symbols that can be imported (for example, function symbols can always be imported as opposed to data symbols we can only be imported when compiling with PIC). This option gives us the full expresivitiy that emscripten needs to be able allow reporting of undefined data symbols as well as the option to disable that. This change does remove the `--unresolved-symbols=import-functions` option, which is been in the codebase now for about a year but I would be extremely surprised if anyone was using it. Differential Revision: https://reviews.llvm.org/D103290
lld Documentation ================= The lld documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. We currently use the 'nature' theme and a Beaker inspired structure. See sphinx_intro.rst for more details.