[libc++] Make __start___lcxx_override/__stop___lcxx_override weak #79347
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After llvm#69498, when `_LIBCPP_MAKE_OVERRIDABLE_FUNCTION_DETECTABLE` functions are absent (possibly after ld --gc-sections), there will no output section `__lcxx_override`. The linker will report an error like ``` ld: error: undefined symbol: __start___lcxx_override >>> referenced by overridable_function.h:108 (libcxx/src/include/overridable_function.h:108) ``` Fix this by making the references weak.
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After #69498, when
_LIBCPP_MAKE_OVERRIDABLE_FUNCTION_DETECTABLEfunctions are absent (possibly after ld --gc-sections), there will no
output section
__lcxx_override. The linker will report an error likeFix this by making the references weak.