Clang: Undefined symbols, but it is there using nm.
clang use ld command to make the final link, I checked the manual and found -U and -undefinedcan ignore undefined symbols.
-U symbol_name
Specified that it is ok for symbol_name to have no definition. With two_levelnamespace, the resulting symbol will be marked dynamic_lookup which means dyld will search all loaded images.
-undefined treatment
Specifies how undefined symbols are to be treated. Options are: error, warning, suppress, or dynamic_lookup. The default is error.
So the final solution is set -Wl,-undefined,dynamic_lookup to OTHER_LDFLAGS, also make sure search path set correctly. It works.
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