clang - How do you debug missing symbols as reported by linker especially of compiler __builtin* functions? -


i keep getting following error linker:

undefined symbols architecture armv7:   "___clear_cache", referenced from:

however when following, 

#if __has_builtin(__clear_cache) #error clear cache defined #endif

i confirmation:

/users/myhome/projects/proofofconcept/coreengine/icache.c:66:2: error: clear cache defined

the code written in standard c, , using gnu make & clang. thanks.


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