GCC Cross Compiler Installation for Nachos on Linux

1. Download binutils and gcc from ftp://ftp.gnu.org and unpack them in the build directory you are using in your system, e.g. /src/nachos_gcc:

binutils: ftp://ftp.gnu.org/gnu/binutils/binutils-2.11.2.tar.gz

gcc:      ftp://ftp.gnu.org/gnu/gcc/gcc-2.95.2.tar.gz

Now the build directory should contain the following sub-directories:

binutils-2.11.2/	gcc-2.95.2/

2. Create two new directories within the build directory:

cross/	gcc-obj/

3. Set up environment, assuming csh is used:
   

% setenv target decstation-ultrix

% setenv host i686-pc-linux-gnu

% setenv prefix /apps/nachos_gcc/cross

% setenv srcdir /apps/nachos_gcc/gcc-2.95.2

% setenv objdir /apps/nachos_gcc/gcc-obj

4. Configure binutils:

% configure --host=$host --target=$target --prefix=$prefix -v

5. Install binutils:

% make all install

A successful install will generate the following files in $prefix/decstation-ultrix/bin/:

ar	as	gcc	ld	nm	ranlib	strip

6. Nachos does not depend on any library, we will fake out the sys-include directory to make the Makefile happy:

% mkdir $prefix/decstation-ultrix/sys-include

7. Configure the gcc cross compiler

% cd $objdir

% $srcdir/configure --host=$host \

    --target=$target \

    --prefix=$prefix \

    --program-prefix=cross \

    --with-gnu-as \

    --with-gnu-ld \

    --with-as=$prefix/decstation-ultrix/bin/as \

    --with-ld=$prefix/decstation-ultrix/bin/ld \

    --enable-languages=c \

    --disable-multilib \

    --disable-libgcj

8. Install the gcc cross compiler

% make

This will generate a libgcc2.a error. Since Nachos does not depend on any library, we will just ignore this error and continue with:

% make -k install

This will complete the install.

The installed cross compiler will be under /apps/nachos_gcc/cross/decstation-ultrix/bin. Modify the path to the cross compiler in the Makefile of the directory where your Nachos program recide,
and everything is ready to run. Good luck.

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2003-09-5 dsn