mruby: powl() not available when compiling for Dreamcast

[Tchan0]

Hello,

Tried to compile the latest mruby for Dreamcast, but it failed with this message:

/opt/toolchains/dc/kos-ports/mruby/build/mruby-3.2.0/src/readfloat.c: In function ‘mrb_read_float’:
/opt/toolchains/dc/kos-ports/mruby/build/mruby-3.2.0/src/readfloat.c:69:12: error: implicit declaration of function ‘powl’; did you mean ‘powf’? [-Werror=implicit-function-declaration]
69 | res *= powl(10.0, sign * e);
| ^~~~
| powf

Cause: bd668e4
that went from pow() to powl()
This commit warned about architectures not supporting long doubles... and the Dreamcast seems to be one of those.

Dreamcast mruby compiled via:

• latest https://github.com/KallistiOS/KallistiOS
• latest https://github.com/KallistiOS/kos-ports
• using sh-elf-gcc 13.2.0

[gyrovorbis]

Confirmed also to be an issue with the latest sh-elf-gcc 14.2.0. I just don't believe Newlib-based platforms are going to have that function for most of its targets... If needed, I think we could add it to KallistiOS, but I'm pretty sure we don't actually have long double, and that it would just be a #define back to regular pow()...

[matz]

I see. I was concerned about that, but it has become a reality. We will take care of it as soon as possible. Thanks for the report.

[matz]

I found out we don't need long double for our purpose. I fill fix it soon.