# EGLIBC-&eglibc-version;

## Installation of EGLIBC

It should be noted that compiling EGLIBC in any way other than the method suggested in this book puts the stability of the system at risk.

Disable linking to `libgcc_eh`:

    cp -v Makeconfig{,.orig}
    sed -e 's/-lgcc_eh//g' Makeconfig.orig > Makeconfig

The following lines need to be added to `config.cache` for EGLIBC to support NPTL:

    cat > config.cache << "EOF"
    libc_cv_forced_unwind=yes
    libc_cv_c_cleanup=yes
    libc_cv_gnu89_inline=yes
    libc_cv_ssp=no
    EOF

    BUILD_CC="gcc" CC="${CLFS_TARGET}-gcc" \
        AR="${CLFS_TARGET}-ar" RANLIB="${CLFS_TARGET}-ranlib" \
        ../eglibc-&eglibc-version;/configure --prefix=/tools \
        --host=${CLFS_TARGET} --build=${CLFS_HOST} \
        --disable-profile --with-tls --enable-kernel=2.6.32 \
        --with-__thread --with-binutils=/cross-tools/bin \
        --with-headers=/tools/include --cache-file=config.cache

## The meaning of the new configure options:

`BUILD_CC="gcc"`

- This sets EGLIBC to use the current compiler on our system. This is used to create the tools EGLIBC uses during its build.

`CC="${CLFS_TARGET}-gcc"`

- This forces EGLIBC to use the GCC compiler that we made for our target architecture.

`AR="${CLFS_TARGET}-ar"`

- This forces EGLIBC to use the `ar` utility we made for our target architecture.

`RANLIB="${CLFS_TARGET}-ranlib"`

- This forces EGLIBC to use the `ranlib` utility we made for our target architecture.

`--disable-profile`

- This builds the libraries without profiling information. Omit this option if profiling on the temporary tools is necessary.

`--with-tls`

- This tells EGLIBC to use Thread Local Storage.

`--enable-kernel=2.6.32`

- This tells EGLIBC to compile the library with support for 2.6.32 and later Linux kernels.

`--with-__thread`

- This tells EGLIBC to use use the __thread for libc and libpthread builds.

`--with-binutils=/cross-tools/bin`

- This tells EGLIBC to use the Binutils that are specific to our target architecture.

`--with-headers=/tools/include`

- This tells EGLIBC to compile itself against the headers recently installed to the `/tools` directory, so that it knows exactly what features the kernel has and can optimize itself accordingly.

`--cache-file=config.cache`

- This tells EGLIBC to utilize a premade cache file.

During this stage the following warning might appear:

>     configure: WARNING:
>     *** These auxiliary programs are missing or
>     *** incompatible versions: msgfmt
>     *** some features will be disabled.
>     *** Check the INSTALL file for required versions.

The missing or incompatible `msgfmt` program is generally harmless. This `msgfmt` program is part of the Gettext package which the host distribution should provide.

Compile the package:

    make

Install the package:

    make install inst_vardbdir=/tools/var/db

`inst_vardbdir=...` ensures that db-Makefile is not installed on the host system

    cp -v ../eglibc-&eglibc-version;/sunrpc/rpc/*.h /tools/include/rpc
    cp -v ../eglibc-&eglibc-version;/sunrpc/rpcsvc/*.h /tools/include/rpcsvc
    cp -v ../eglibc-&eglibc-version;/nis/rpcsvc/*.h /tools/include/rpcsvc

Details on this package are located in contents-eglibc