build/release_xc16v1_25/production/src/fix16.o(.text+0x43a): In function `.LSM71': : undefined reference to `___clzsi2'

[Karl Edler]

Hello,

I would like to use the libfixmath library on a dsPIC33. However when I try to compile it, the compiler complains of undefined references to  `___clzsi2'. Does anyone know where this function is coming from?

Regards,

Karl Edler

[Karl Edler]

Got it. Although the Microchip compiler defines the symbol __GNUC__ it does not define the function __builtin_clzl(x). Therefore

the "#ifdef __GNUC__" statements must be modified to simply define the function: "static uint8_t clz(uint32_t x)".

Then the thing compiles.

Hope this helps someone....