rjmccall added a comment. I think `-fvisibility=hidden` isn't good enough because you want to infer hidden visibility even for external symbol references, and that's just not how global visibility works. But after this discussion, I'm prepared to accept that (1) we should have some sort of single-image compiler mode that implies that all symbols are defined within the image and (2) you can make your toolchain imply that together with `-fvisibility=hidden` and then have specific symbols opt in to non-hidden visibility if they need to be accessible to whatever loader / runtime you have.
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