Re: [gentoo-embedded] crossdev and ASAN

[Joakim Tjernlund <joakim.tjernlund@transmode.se>]

On Fri, 2015-11-13 at 13:16 +0100, Peter Stuge wrote:
> Joakim Tjernlund wrote:
> > > cross toolchains cannot use ASAN today:
> > > powerpc-g2.20-linux-gnu-gcc -fsanitize=address mmap.c
> > > /usr/libexec/gcc/powerpc-g2.20-linux-gnu/ld: warning: libstdc++.so.6, needed by /usr/lib/gcc/powerpc-
> > > g2.20-
> > > linux-gnu/4.9.3/libasan.so, not found (try using -rpath or -rpath-link)
> > 
> > hmm, there is a libstdc++.so.6 which will work to link with under:
> >  /usr/lib64/gcc/powerpc-g2.20-linux-gnu/4.9.3/libstdc++.so.6
> > But powerpc-g2.20-linux-gnu-gcc cannot find it there, stracing gcc
> > one can see:
> > 
> > [pid  3860] open("/usr/powerpc-g2.20-linux-gnu/...
> 
> Is /usr/powerpc-g2.20-linux-gnu the sysroot?
Yes

> If yes, why is libstdc++.so.6 not in there?

I think it is because cross-powerpc-g2.20-linux-gnu/glibc is special, it is not
the real/whole glibc, just the stuff needed x-compile.
But as there is and /usr/lib64/gcc/powerpc-g2.20-linux-gnu/4.9.3/libstdc++.so.6 gcc 
shoudl look there? libasan.so.1 lives there also.

Speaking of libasan.so, it has an odd runpath:
0x0000001d (RUNPATH) Library runpath: [/usr/powerpc-g2.20-linux-gnu/lib/../lib]

My host has(amd64):
0x000000000000001d (RUNPATH) Library runpath: [/usr/lib/../lib64]

 Jocke

> If no, why is gcc looking there?
> 
> 
> //Peter
>