Re: linking correct libc

[ng at piments dot com]

Yann E. MORIN wrote:
> "ng",
> All,
>
> On Sunday 24 May 2009 22:09:27 ng@piments.com wrote:
> > Yann E. MORIN wrote:
> > > It is *not* needed to pass --sysroot to the compielrs build with
> > > crosstool-NG.
> > thanks, I realised that , it was an attempt to verofu what was happening 
> > by explicitly specifying everything. When it made no difference I 
> > concluded the built-in sysroot was correctly interpreted and the problem 
> > lay elsewhere.
>
> So, your toolchain is working, and you are trying to reproduce gcc's internal
> logic by passing args on the command line, right?
>
> > > What does the follwing command says:
> > > /back/ts/ct-wkg//x-tools/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc \
> > was something missed off after the \   :?
>
> Yes, sorry:
> bla-bla-gcc -print-search-dirs
voila:

/back/ts/ct-wkg//x-tools/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc 
-print-search-dirs
install: 
/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../lib/gcc/arm-unknown-linux-gnueabi/4.3.2/
programs: 
=/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../libexec/gcc/arm-unknown-linux-gnueabi/4.3.2/:/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../libexec/gcc/:/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../lib/gcc/arm-unknown-linux-gnueabi/4.3.2/../../../../arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi/4.3.2/:/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../lib/gcc/arm-unknown-linux-gnueabi/4.3.2/../../../../arm-unknown-linux-gnueabi/bin/
libraries: 
=/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../lib/gcc/arm-unknown-linux-gnueabi/4.3.2/:/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../lib/gcc/:/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../lib/gcc/arm-unknown-linux-gnueabi/4.3.2/../../../../arm-unknown-linux-gnueabi/lib/arm-unknown-linux-gnueabi/4.3.2/:/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../lib/gcc/arm-unknown-linux-gnueabi/4.3.2/../../../../arm-unknown-linux-gnueabi/lib/:/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../arm-unknown-linux-gnueabi//sys-root/lib/arm-unknown-linux-gnueabi/4.3.2/:/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../arm-unknown-linux-gnueabi//sys-root/lib/:/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../arm-unknown-linux-gnueabi//sys-root/usr/lib/arm-unknown-linux-gnueabi/4.3.2/:/back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../arm-unknown-linux-gnueabi//sys-root/usr/lib/

> > /back/ts/ct-wkg//x-tools/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc 
> > \ -print-file-name=libc.so
> > /back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../arm-unknown-linux-gnueabi//sys-root/usr/lib/libc.so
>
> OK.
>
> > cat 
> > /back/ts/ct-wkg/x-tools/arm-unknown-linux-gnueabi/bin/../arm-unknown-linux-gnueabi//sys-root/usr/lib/libc.so
> > /* GNU ld script
> >     Use the shared library, but some functions are only in
> >     the static library, so try that secondarily.  */
> > OUTPUT_FORMAT(elf32-littlearm)
> > GROUP ( /lib/libc.so.6 /usr/lib/libc_nonshared.a  AS_NEEDED ( 
> > /lib/ld-linux.so.3 ) )
> > OK , so that explains the reference to /lib/libc.so.6 , is that what you 
> > would expect to see here?
>
> Yes, correct. Those are paths relative to the sysroot, so gcc will hapilly
> find them.
> BTW, notice: ld-linux.so.3 -> EABI-era dynamic linker, good.
>
> To conclude this thread: does your toolchain correctly works by default?
Well it builds a bootable kernel and busybox but I can't get past this 
incompatible /lib/libc.so.6 error in portmap.


 CPPFLAGS="-I/back/ts/root2/usr/include" 
LDFLAGS="-L/back/ts/root2/usr/lib/" make
arm-unknown-linux-gnueabi-gcc -L/back/ts/root2/usr/lib/ -pie  portmap.o 
pmap_check.o from_local.o  -lwrap -o portmap
/back/ts/ct-ng/x-tools/arm-unknown-linux-gnueabi/lib/gcc/arm-unknown-linux-gnueabi/4.3.2/../../../../arm-unknown-linux-gnueabi/bin/ld: 
skipping incompatible /lib/libc.so.6 when searching for /lib/libc.so.6
/back/ts/ct-ng/x-tools/arm-unknown-linux-gnueabi/lib/gcc/arm-unknown-linux-gnueabi/4.3.2/../../../../arm-unknown-linux-gnueabi/bin/ld: 
cannot find /lib/libc.so.6
collect2: ld returned 1 exit status
make: *** [portmap] Error 1


Since that /lib/libc.so.6 would appear to be the sys-root one and you 
say that file looks good, why is it crapping out and declaring this file 
"incompatible"?

Thanks again.


> Regards,
> Yann E. MORIN.


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