I all I'm running a build system (buildroot) which produces some software.
I'm asked to put in the path to my cross compiler which I do. I then try to make the software but I get the following error.

External toolchain doesn't support --sysroot. Cannot use.


can anyone help. Thanks

What version of gcc is your cross-compiler?

version 4.1.1

arm-linux-gcc -v

Using built-in specs.
Target: arm-linux-uclibc
Configured with: /opt/buildroot.920t-cc/toolchain_build_arm_nofpu/gcc-4.1.1/configure --prefix=/usr/local/arm/4.1.1-920t --build=i386-pc-linux-gnu --host=i386-pc-linux-gnu --target=arm-linux-uclibc --enable-languages=c,c++ --disable-__cxa_atexit --enable-target-optspace --with-gnu-ld --with-gmp=/opt/buildroot.920t-cc/toolchain_build_arm_nofpu/gmp --with-mpfr=/opt/buildroot.920t-cc/toolchain_build_arm_nofpu/mpfr --enable-shared --disable-nls --enable-threads --disable-multilib --with-float=soft
Thread model: posix
gcc version 4.1.1

You need to enable sysroot support for gcc and for binutils when configuring: '--enable-sysroot'

Sorry I'm not sure what you mean here? Do you mean when the cross compiler is itself compiled? If so problem is it's from the chip manufacturer and I'd rather not build my own as I fear it may cause problems. Something to do with floating points which don't work in the way they should. Can I add --enable-syroot to the already built compiler?

Can I add --enable-syroot to the already built compiler?
No, that's a compile-time option. I assumed you were using your own toolchain.