Re: configure: error: No support for this target/host combination.

["Yang" <lx4r2qw02 at sneakemail dot com>]

Ian Lance Taylor iant-at-google.com |gcc-help| wrote:
> "Yang" <lx4r2qw02@sneakemail.com> writes:
>
> > Ian Lance Taylor iant-at-google.com |gcc-help| wrote:
> > > "Yang" <lx4r2qw02@sneakemail.com> writes:
> > >
> > > > Yang lx4r2qw02-at-sneakemail.com |gcc-help| wrote:
> > > > > When building gcc 4.2.0 on my Ubuntu 7.10 x86-64, I get:
> > > > >   configure: error: No support for this target/host combination.
> > > > > I ran configure --target=i386-jos-elf. I can't really tell what was
> > > > > being built, but it seems like libstdc++. It would be nice to have C++
> > > > > support (I imagine it must exist for i386+ELF), but if this turns out
> > > > > to be difficult, I'd also be interested in knowing how to . Thanks in
> > > > > advance for any guidance.
> > > > To complete that second-to-last sentence: "how to disable building
> > > > libstdc++".
> > > If you don't need C++, use the option --enable-languages=c when you
> > > run configure.
> > > Ian
> > Thanks Ian. However, now I run into another build error:
>
> Please reply to the mailing list, not just to me.  Thanks.

I had replied to the list as well.

> > /toast/pkg/gcc-i386-jos-elf/v4.2.0/1/src/gcc-4.2.0/host-x86_64-unknown-linux-gnu/gcc/xgcc
> > -B/toast/pkg/gcc-i386-jos-elf/v4.2.0/1/src/gcc-4.2.0/host-x86_64-unknown-linux-gnu/gcc/
> > -B/usr/local/i386-jos-elf/bin/ -B/usr/local/i386-jos-elf/lib/ -isystem
> > /usr/local/i386-jos-elf/include -isystem
> > /usr/local/i386-jos-elf/sys-include -DHAVE_CONFIG_H
> > -I. -I../.././libssp -I. -Wall -O2 -g -O2 -MT ssp.lo -MD -MP -MF
> > .deps/ssp.Tpo -c
> > ../.././libssp/ssp.c -o ssp.o
> > ../.././libssp/ssp.c: In function '__guard_setup':
> > ../.././libssp/ssp.c:70: warning: implicit declaration of function 'open'
> > ../.././libssp/ssp.c:70: error: 'O_RDONLY' undeclared (first use in
> > this function)
>
> Easy fix: configure with --disable-libssp.
>
> Ian

Thanks all, now everything works.

Out of curiosity, why couldn't libstdc++ and libssp build for this 
target? Is this a common issue for "non-mainstream" targets?