GCC Manual Build

Goto Installing GCC- GNU Project it describes the generic installation procedure.

1. Retrieve source code GCC: Anonymous read-only Git access- GNU Project 

        git clone git://gcc.gnu.org/git/gcc.git srcdir

        OR

         git clone https://gcc.gnu.org/git/gcc.git srcdir

2. Prerequisites   Downloading GCC- GNU Project 

        Go to srcdir, run contrib/download_prerequisites.

3. Download GMP, MPFR and/or MPC and/or isl.

        apt-get install libgmp-dev libmpfr-dev libmpc-dev

        OR 
        Download the package and build manually, go to Index of /pub/gcc/infrastructure . 

4. Manual install GMP, MPFR and/or MPC and/or isl 

• Download gmp-6.2.1.tar.xz  The GNU MP Bignum Library
  • tar xvf gmp-6.2.1.tar.xz
  • ./configure --prefix=/usr/local/gmp
  • make -j8 && make install
• Download mpfr-4.1.0.tar.xz Index of /gnu/mpfr
  • tar xvf mpfr-4.1.0.tar.xz
  •  ./configure --prefix=/usr/local/mpfr --with-gmp=/usr/local/gmp
  • make -j8 && make install
• Download mpc-1.2.1.tar.gz Index of /gnu/mpc
  • tar xvf mpc-1.2.1.tar.gz
  • ./configure --prefix=/usr/local/mpc --with-gmp=/usr/local/gmp --with-mpfr=/usr/local/mpfr/ 
  • make -j8 && make install
• Download isl-0.24.tar.bz2 https://gcc.gnu.org/pub/gcc/infrastructure/ 
  • tar xvf isl-1.2.1.tar.gz
  • ./configure --prefix=/usr/local/isl --with-gmp-prefix=/usr/local/gmp/
  • make -j8 && make install

5. If 4, export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/isl/lib:/usr/local/gmp:/usr/local/mpfr:/usr/local/mpc

6. Install flex, apt-get install flex.

7. Configure GCC:

• % mkdir objdir
• % cd objdir
• % srcdir/configure --disable-multilib --prefix=$srcdir/install
  
  Any configure error, go to objdir/Config.log.

You can specify the path 

--with-gmp=pathname

--with-gmp-include=pathname

--with-gmp-lib=pathname

--with-mpfr=pathname

--with-mpfr-include=pathname

--with-mpfr-lib=pathname

--with-mpc=pathname

--with-mpc-include=pathname

--with-mpc-lib=pathname

8. make -j`nproc` && make install

It install the gcc to $srcdir/install which is set in gcc configuration.

9. Use the manual gcc

export CC=$srcdir/install/gcc
export CXX=$srcdir/install/g++

10. Now, run cmake /path/to/your/project, it uses this manual build.