[Snek] ev3 build: musl or static older libc, or ?

Keith Packard keithp at keithp.com
Thu Feb 20 08:46:17 PST 2020

"Mikhail Gusarov" <dottedmag at dottedmag.net> writes:

> Sure, it works. The symbols are all from libm: powf, expf, exp2f, logf, 
> log2f.


> __asm__ declarations need to be added to every compilation unit where
> the symbols are used, namely snek-exec.c and snek-math.c.

Could you stick them in an EV3-specific header file included by those
modules? I just tried placing this in snek-posix.h and it seemed to

__asm__(".symver powf,powf at GLIBC_2.2.5");
__asm__(".symver expf,expf at GLIBC_2.2.5");
__asm__(".symver exp2f,exp2f at GLIBC_2.2.5");
__asm__(".symver logf,logf at GLIBC_2.2.5");
__asm__(".symver log2f,log2f at GLIBC_2.2.5");

> OK to have them there under #ifdef? What would be the good preprocessor 
> define to check here?

Hrm. It should probably reflect the glibc version requirement. Something
like SNEK_USE_GLIBC_2_2_5_MATH ?

I wonder what changed in these functions ...

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