Hello,
I have a problem with the Microtec Compiler MCC68K. We have written our own memcpy() function due to safety reasons. But even with all optimizations turned off the MCC68K replaces a function call to memcpy() with several lines of assembler code during the compilation stage. The linker will never see an unresolved symbol like _memcpy. Has anyone an idea how we can force the compiler to use our own function ?
Thanks Karl-Heinz
Of curiosity, what "safety reasons" made you write your own memcpy() ? If you want to replace standard library calls with your own versions (so that you know for sure exactly what code is running), you would probably be better off using new names for the functions and avoiding the standard ones.
There may be specific compiler options to control the use of "intrinsic" functions like this - compilers often optomise memcpy() and other library functions (such as abs() ) because the code is very much more efficient when inlined. If you want to force it to use your own function and can't find switches to do this, perhaps you could do something like: #define memcpy(dest, src, num) Memcpy(dest, src, num) where Memcpy() is your own version.
Global search and replace all occurrences of memcopy with safecopy.
Cheers, Alf
Use a different name. It is already undefined behaviour for you to use the memcpy name in your own source - that is reserved for the implementation. See the C standard.
Or, if you prefer not to change call sites, use a macro.
--Toby
Give it another name.
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