selective linking of floating point support for *printf / *scanf

[Thomas Preud'homme]

> From: gcc-owner@gcc.gnu.org [mailto:gcc-owner@gcc.gnu.org] On
> Behalf Of Joseph S. Myers
> 
> I'm not clear if you're proposing such a patch for review, but note:

Yep but not yet for inclusion as I'm waiting to see if this would suit the use case of avr people.

> 
> (a) you mean DEF_EXT_LIB_BUILTIN (since asprintf and vasprintf aren't in
> ISO C);

Ok.

> 
> (b) please don't add new target macros such as
> CUSTOM_STDI_WEAK_SYM_PATTERN and
> CUSTOM_STDO_WEAK_SYM_PATTERN (if
> something is defined in tm_defines and used in architecture-
> independent
> code, it's effectively a target macro), find a way to implement these as
> hooks instead.

Oh right, indeed. I didn't realize. Thanks for the review.

Joern feel free to give your opinion about whether such an approach would be alright for you.

Best regards,

Thomas