Re: [avr-libc-dev] How attached are people to the implementation of rand()/random()?

[Pitchumani Sivanupandi]

On Wednesday 07 December 2016 02:39 AM, Georg-Johann Lay wrote:
> George Spelvin schrieb:
> > > Either Debian is running patches atop GNU, or avr-libc test suite has
> > > not been adjusted to factor out different gcc versions.
> >
> > The Debian diffs can be found in the right-hand column of
> > https://packages.debian.org/sid/gcc-avr
> > specifically
> > http://http.debian.net/debian/pool/main/g/gcc-avr/gcc-avr_4.9.2+Atmel3.5.3-1.diff.gz 
>
> That comes with external references, e.g. all the XMEGA stuff and many
> others like 55-gcc-4.3.0-attiny167.patch etc.
>
> I'd propose you use GCC trunk HEAD and Binutils master; if that and
> rerunning bootstrap does not do the trick, you found a bug and I
> wonder how the folks are testing avr-libc :-)
>
> > > Presumably, someone adds this option by hand, because if avr-gcc
> > > added it the error message would be "ld: cannot find -latmega128".
> >
> > That is indeed what runtest.sh does.  Here's the result of "bash -x 
> > ./runtest.sh -s".
> > The actual compiler invocation is the tenth last line.
> >
> > [...]
> > + avr-gcc -Wundef -I. -gdwarf-4 -W -Wall -pipe -Os -isystem 
> > ../../include -nostdlib -std=gnu99 -mmcu=atmega128 -o aux.elf 
> > time/aux.c ../../avr/lib/avr51/libc.a ../../avr/lib/avr51/libm.a 
> > ../../avr/lib/avr51/atmega128/libatmega128.a -lgcc
> > avr-gcc: error: ../../avr/lib/avr51/atmega128/libatmega128.a: No such 
> > file or directory
>
> Presumably, it goes like follows: avr-libc detects from the version of
> avr-gcc that it does not add -latmega128 and hence skips building
> libatmega128.a, hence no such .a in the avr-libc build tree.

Yes. For gcc lesser than 5.1, it do not enable device library by default.

If the gcc is < 5.1 and patched to have device library, then users can use
--enable-device-lib option to configure avr-libc to build device libraries.

Regards,
Pitchumani