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Re: [avr-libc-dev] How attached are people to the implementation of rand

From: Georg-Johann Lay
Subject: Re: [avr-libc-dev] How attached are people to the implementation of rand()/random()?
Date: Tue, 06 Dec 2016 21:03:02 +0100
User-agent: Thunderbird (Windows/20100228)

George Spelvin schrieb:
Thanks for the help.  It's not on the critical path yet, but I would
like to get some self-tests working.

This looks strange. With avr-libc from trunk and a reasonable
up to date avr-gcc (5.2+) the crt should be located in


Perhaps the fact (I mentioned in in passing in a previous message to
the list) that I'm using 4.9.2 (because that's what Debian has packaged)
has had an effect?

avr-gcc 4.9 shouldn't try to link against libatmega128.a at all, and
this is how my 4.9.2-pre1 (home-brew canadian cross) behaves.
avr-gcc 4.9 defines a spec function to add -lm128, but that spec
function is dead :-)


The question is where the libatmega128.a is coming fromcomes from...
Either Debian is running patches atop GNU, or avr-libc test suite has
not been adjusted to factor out different gcc versions.

Presumably, someone adds this option by hand, because if avr-gcc
added it the error message would be "ld: cannot find -latmega128".

Another thing is that I haven't installed *anything* yet; there is no
$prefix/avr directory.  I was assuming that the tests would run against
the built tree *before* installation.  (If I can't run "make check"
before "make install", that smells like a bug that needs fixing.)

Well, I never ran avr-libc tests, I am just doing the avr-gcc thing...

Maybe for the time being it's the simplest approach to build your own
GCC and Binutils all with same $prefix in $HOME, dito for libc.

avr-libc can build against non-installed avr-gcc by
CC="$build/gcc/xgcc -B$build/gcc" where $build refers to the gcc
build dir, which should never be in $source b.t.w.


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