[Buildroot] external toolchain and sysroot

[Thomas Petazzoni]

Hello,

On Thu, 25 Mar 2010 16:14:19 +0000 (UTC)
Grant Edwards <grant.b.edwards at gmail.com> wrote:

> > But in linking phase:
> > /home/yury/toolchain/arm-indigo-linux-uclibcgnueabi/bin/arm-indigo-linux-uclibcgnueabi-gcc 
> > -DAUTOCONF -DPOSIX -DUSG -o em ansi.o basic.o bind.o buffer.o crypt.o display.o eval.o exec.o 
> > file.o fileio.o ibmpc.o input.o isearch.o line.o lock.o main.o pklock.o posix.o random.o 
> > region.o search.o spawn.o tcap.o termio.o vmsvt.o vt52.o window.o word.o -lncurses
> > /home/yury/toolchain/arm-indigo-linux-uclibcgnueabi/lib/gcc/arm-indigo-linux-uclibcgnueabi/4.3.4/../..
> > /../../arm-indigo-linux-uclibcgnueabi/bin/ld: cannot find -lncurses
> >
> > here --sysroot is omitted and thus I'm very sad :-)

That's a problem of uemacs.mk, as you found out later.

In fact, many of the packages that do not use the Makefile.autotools.in
infrastructure are broken with regard to external toolchain support.
I've fixed some of the packages I tested, but I couldn't fix them all.
So it's our job, external toolchain users, to progressively fix all
packages so that they build nicely with external toolchains. Of course,
if you don't know how to fix a package, just report the bug, so we'll
know it's broken and we'll try to fix it.

> I know how you feel.  That's exactly the same problem I had building
> busybox two weeks ago: --sysroot was passed correctly in the compile
> phase, but wasn't passed in the link phase.  Apparently the external
> toolchains used by the devs don't need a --sysroot during linking.
> Apparently our toolchains do.

I don't think so. Just like Yury, I use toolchains generated by
Crosstool-NG (for i686, ARM glibc, ARM uClibc OABI, ARM uClibc EABI,
PowerPC, etc.). So I encounter the same problem, it's just that I never
tried to build uemacs or vsftpd.

> > I can't figure this out by myself. TARGET_LDFLAGS are good, 
> > TARGET_CFLAGS are too.
> 
> In the busybox .mk file, I found that TARGET_LDFLAGS wasn't being used
> (it wasn't being passed to the "make" command).  I had to patch the
> .mk file to pass the TARGET_LDFLAGS value to make.

I've seen your bug about this and I don't have the same problem with
Crosstool-NG toolchains. It's still on my TODO-list to try to reproduce
the problem you're having.

For the moment, I'm busy doing some more heavy development work for
Buildroot, I plan to do more bug-fixing related work during the last
month of the release cycle.

Regards, 

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com