wasm-backend: Don't export symbols by default from MAIN/SIDE_MODULEs #10081
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This matches the current behavior of fastcomp since #7371 disabled EXPORT_ALL for MAIN/SIDE_MODULEs. Since most of our dylink tests set EXPORT_ALL this didn't get noticed.
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kripken
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Dec 20, 2019
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I think this is maybe not the way to go. My understanding of EXPORT_ALL is that it exports stuff onto the Module object, and nothing more. It has no effect on keeping code alive through compiling and linking, in particular.
(It is true that it also affects metadce, which is arguably odd, but that's a special optimization after normal compilation and linking, so it's debatable; perhaps we should remove that.)
So I don't think EXPORT_ALL should be used when interfacing with LLVM, clang, wasm-ld, etc. It should just affect exporting JS stuff onto Module.
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This matches the current behavior of fastcomp since #7371 disabled
EXPORT_ALL for MAIN/SIDE_MODULEs.
Since most of our dylink tests set EXPORT_ALL this didn't get noticed.