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In xcode 5 I get this warning:
"implicit declaration of function free is invalid in c99"
How should I free my c structures if I can't use the function free()?
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implicit declaration of function means you do not have Prototypes for your functions. You should have a Prototype before the function is used. "call the block" I assume your Blocks are functions. 9/30/2020.
Function name typo: Often the function name of the declaration does not exactly match the function name that is being called. For example, startBenchmark() is declared while StartBenchmark() is being called. I recommend to fix this by copy-&-pasting the function name from the declaration to wherever you call it.
Such an 'implicit declaration' is really an oversight or error by the programmer, because the C compiler needs to know about the types of the parameters and return value to correctly allocate them on the stack.
An implicitly declared function is one that has neither a prototype nor a definition, but is called somewhere in the code. Because of that, the compiler cannot verify that this is the intended usage of the function (whether the count and the type of the arguments match).
You should include <stdlib.h>.
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