asm hints in aco.h aren't c99?

[postwait]

The asm("acosw"); in aco.h needs to be __asm("acosw");

[hnes]

Thank you very much for your report, @postwait.

I just committed a new update to the master branch.

PS:

if anyone interests in this topic, here are some more details about the differences between asm and __asm__:

https://gcc.gnu.org/onlinedocs/gcc-7.2.0/gcc/Alternate-Keywords.html#Alternate-Keywords
https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html