5.7. Cross GCC-4.1.1 - Static

#### Cross-Compiled Linux From Scratch - Version 1.0.0rc1-ALPHA

### Chapter 5. Constructing Cross-Compile Tools

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# 5.7. Cross GCC-4.1.1 - Static

The GCC package contains the GNU compiler collection, which includes the C and C++ compilers.

## 5.7.1. Installation of Cross GCC Compiler with Static libgcc and no Threads

Make a couple of essential adjustments to the specs file to ensure GCC uses our build environment:

    patch -Np1 -i ../gcc-4.1.1-specs-1.patch

To make sure that a couple of tools use the proper syntax, apply the following patch:

    patch -Np1 -i ../gcc-4.1.1-posix-1.patch

The following patch ensures that gcc does not search the `/usr` directory for `libgcc_s.so` when cross-compiling:

    patch -Np1 -i ../gcc-4.1.1-cross_search_paths-1.patch

Change the StartFile Spec to point to the correct library location:

    echo "
    #undef STARTFILE_PREFIX_SPEC
    #define STARTFILE_PREFIX_SPEC \"/tools/lib/\"" >> gcc/config/alpha/linux.h

Now alter gcc's c preprocessor's default include search path to use `/tools` only:

    cp -v gcc/Makefile.in{,.orig}
    sed -e "s@\(^CROSS_SYSTEM_HEADER_DIR =\).*@\1 /tools/include@g" \
        gcc/Makefile.in.orig > gcc/Makefile.in

### Important

The above patches and sed's are critical in ensuring a successful overall build. Do not forget to apply them.

The GCC documentation recommends building GCC outside of the source directory in a dedicated build directory:

    mkdir -v ../gcc-build
    cd ../gcc-build

Prepare GCC for compilation:

    ../gcc-4.1.1/configure --prefix=/cross-tools \
        --host=${LFS_HOST} --target=${LFS_TARGET} \
        --with-local-prefix=/tools --disable-nls --disable-shared \
        --disable-threads --enable-languages=c

The meaning of the configure options:

`--with-local-prefix=/tools`

  The purpose of this switch is to remove `/usr/local/include` from gcc's include search path. This is not absolutely essential, however, it helps to minimize the influence of the host system.

`--disable-shared`

  Disables the creation of the shared libraries.

`--disable-threads`

  This will prevent GCC from looking for the multi-thread include files, since they haven't been created for this architecture yet. GCC will be able to find the multi-thread information after the Glibc headers are created.

`--enable-languages=c`

  This option ensures that only the C compiler is built.

Continue with compiling the package:

    make all-gcc

Install the package:

    make install-gcc

Details on this package are located in Section 10.9.2, “Contents of GCC.”

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