See this reddit post for details. This is the referenced implementation of the post.
Things You Should Know:
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Use my patched version of GCC here.
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There should be some script to automatically set CXX_STDMODULE. I didn't write one. Replace it with yours.
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Feel free to edit and test.
Other Words:
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The project and every file it contains are distributed under GNU Affero General Public License.
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Please don't embarrass me if I'm wrong because I'm super noob and anxious about it.