6.4. GCC-4.1.1

#### Cross-Compiled Linux From Scratch - Version 1.0.0rc1-MIPS64-Multilib

### Chapter 6. Constructing a Temporary System

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# 6.4. GCC-4.1.1

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

## 6.4.1. Installation of GCC

The following patch fixes the searching of multilib dirs for specs file:

    patch -Np1 -i ../gcc-4.1.1-PR20425-1.patch

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

Now we will change cpp's search path not to look in `/usr/include`:

    cp -v gcc/cppdefault.c{,.orig}
    sed -e '/#define STANDARD_INCLUDE_DIR/s@"/usr/include"@0@g' \
        gcc/cppdefault.c.orig > gcc/cppdefault.c

Also, we need to set the directory searched by the fixincludes process for system headers, so it won't look at the host's headers:

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

When searching for the multilibs, force the build to use the results of `--print-multi-lib` from our cross-compiler, not the native compiler gcc builds now:

    cp -v gcc/Makefile.in{,.orig2}
    sed -e "/MULTILIBS/s@\$(GCC_FOR_TARGET)@/cross-tools/bin/${CC}@g" \
       gcc/Makefile.in.orig2 > 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

Before starting to build GCC, remember to unset any environment variables that override the default optimization flags.

Prepare GCC for compilation:

    CC="${CC} ${BUILD64}" CXX="${CXX} ${BUILD64}" \
        ../gcc-4.1.1/configure --prefix=/tools --libdir=/tools/lib64 \
        --build=${LFS_HOST} --host=${LFS_TARGET} --target=${LFS_TARGET} --with-abi=64 \
        --with-local-prefix=/tools --enable-long-long --enable-c99 \
        --enable-shared --enable-threads=posix --enable-__cxa_atexit \
        --disable-nls --enable-languages=c,c++ --disable-libstdcxx-pch

The meaning of the new configure options:

`CXX="${CXX} ${BUILD64}"`

  This forces the C++ compiler to use our Build 64 FLAGS.

`--disable-libstdcxx-pch`

  Do not build the pre-compiled header (PCH) for `libstdc++`. It takes up a lot of space, and we have no use for it.

Compile the package:

    make AS_FOR_TARGET="${AS}" \
        LD_FOR_TARGET="${LD}"

Install the package:

    make install

Many packages use the name cc to call the C compiler. To satisfy those packages, create a symlink:

    ln -sv gcc /tools/bin/cc

Details on this package are located in Section 10.11.2, “Contents of GCC.”

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