with-build-sysroot support

[Samson Luk]

Yann, All,

I am glad to report have successful build the gcc4.5.0 cross compiler
for arm-linux in my Ubuntu box, compiled c and c++ programs and all
run fine in the target machine:

$ arm-none-linux-gnueabi-gcc -v
Using built-in specs.
COLLECT_GCC=arm-none-linux-gnueabi-gcc
COLLECT_LTO_WRAPPER=/opt/arm-none-linux-gnueabi/libexec/gcc/arm-none-linux-gnueabi/4.5.0/lto-wrapper
Target: arm-none-linux-gnueabi
Configured with:
/usr/local/src/gccCross/targets/src/gcc-4.5.0/configure
--build=i686-build_pc-linux-gnu --host=i686-build_pc-linux-gnu
--target=arm-none-linux-gnueabi --prefix=/opt/arm-none-linux-gnueabi
--with-sysroot=/opt/arm-none-linux-gnueabi/arm-none-linux-gnueabi//sys-root
--enable-languages=c,c++ --disable-multilib --with-arch=armv5te
--with-cpu=arm926ej-s --with-pkgversion=crosstool-NG-1.8.2
--enable-__cxa_atexit --disable-libmudflap
--with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic
-lm' --with-gmp=/usr/local/src/gccCross/targets/arm-none-linux-gnueabi/build/static
--with-mpfr=/usr/local/src/gccCross/targets/arm-none-linux-gnueabi/build/static
--with-ppl=/usr/local/src/gccCross/targets/arm-none-linux-gnueabi/build/static
--with-cloog=/usr/local/src/gccCross/targets/arm-none-linux-gnueabi/build/static
--with-mpc=/usr/local/src/gccCross/targets/arm-none-linux-gnueabi/build/static
--with-libelf=/usr/local/src/gccCross/targets/arm-none-linux-gnueabi/build/static
--enable-threads=posix --enable-target-optspace
--disable-libstdcxx-pch
--with-local-prefix=/opt/arm-none-linux-gnueabi/arm-none-linux-gnueabi//sys-root
--disable-nls --enable-symvers=gnu --enable-c99 --enable-long-long
Thread model: posix
gcc version 4.5.0 (crosstool-NG-1.8.2)

However, I have a different sysroot location in my arm box so at the
moment I need to setup LDFLAGS  '-Wl,-rpath=' and
'-Wl,--dynamic-linker='.  Is it possible for crosstool-NG to make use
of '--with-build-sysroot' together with '--with-sysroot' for building
the cross compiler so that a different sysroot in the target machine
can be defined?

Regards,
Samson

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