I guess making the fallback symbols weak doesn't help? Not even when they're inside libxul?
Bug 1706452 Comment 5 Edit History
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I guess making the fallback symbols weak doesn't help? Not even when they're inside libxul? PS: Never mind, I see symbols can only be weak when statically linking. (Although GLibC `ld.so` can also do strong-over-weak resolution when dynamically linking, this goes against the standard and is hidden behind `LD_DYNAMIC_WEAK`.)