Option 1: The longer and customised method

Step 1: Download the following prerequisites applications libraries from https://gcc.gnu.org/pub/gcc/infrastructure/

1. gmp-6.2.1
2. mpfr-4.1.0
3. mpc-1.2.1

Step 1. Install gmp-6.2.1

% bunzip2 gmp-6.2.1.tar.bz2
% tar -xvf gmp-6.2.1.tar
% cd gmp-6.2.1
% ./configure --prefix=/usr/local/gmp-6.2.1
% make 
% make install

Step 2: Install mpfr-4.1.0 (requires gmp-6.2.1 as prerequisites)

% bunzip2 mpfr-4.1.0.tar.bz
% tar -xvf mpfr-4.1.0.tar
% cd mpfr-4.1.0/
% ./configure --prefix=/usr/local/mpfr-4.1.0 --with-gmp=/usr/local/gmp-6.2.1/
% make
% make install

Step 3: Install mpc-1.2.1 (requires gmp-6.2.1 and mpfr-4.1.0)

% tar -zxvf mpc-1.2.1.tar.gz
% cd mpc-1.2.1/
% ./configure --prefix=/usr/local/mpc-1.2.1 -with-gmp=/usr/local/gmp-6.2.1 --with-mpfr=/usr/local/mpfr-4.1.0
% make
% make install

Step 4: Install isl-0.24 (requires gmp-6.2.1 as prerequisites)

% bunzip2 isl-0.24.tar.bz2
% tar -xvf isl-0.24.tar
% cd isl-0.24
% ./configure --prefix=/usr/local/isl-0.24 --with-gmp-prefix=/usr/local/gmp-6.2.1/
% make
% make install

Configure and Build GCC

% git clone git://gcc.gnu.org/git/gcc.git
% cd gcc
% mkdir build-gcc
% cd build-gcc
% ../configure --prefix=/usr/local/gcc-12.1 --enable-bootstrap --enable-languages=c,c++,fortran,lto --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --disable-libmpx --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux --with-static-standard-libraries --with-gmp=/usr/local/gmp-6.2.1 --with-mpc=/usr/local/mpc-1.2.1 --with-mpfr=/usr/local/mpfr-4.1.0 --with-isl=/usr/local/isl-0.24 --with-isl-lib=/usr/local/isl-0.24/lib --with-isl-include=/usr/local/isl-0.24/include

You may encounter issues like

/usr/local/software/gcc/build-gcc/./gcc/cc1: error while loading shared libraries: libisl.so.23: cannot open shared object file: No such file or directory

An alternative way is to let GCC do the download for you….. Retracing the steps

% git clone git://gcc.gnu.org/git/gcc.git
% cd gcc
% contrib/download_prerequisites
% mkdir build-gcc
% cd build-gcc
% ../configure --prefix=/usr/local/gcc-12.1 --enable-bootstrap --enable-languages=c,c++,fortran,lto --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --disable-libmpx --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux --with-static-standard-libraries

If you encounter any errors during make such as

/usr/include/gnu/stubs.h:7:11: fatal error: gnu/stubs-32.h: No such file or directory

It is due to missing glibc-devel and glibc-devel.i686. You have to do a dnf install glibc-devel and glibc-devel.i686

% dnf install glibc-devel glibc-devel.i686

Option 2: The Faster Method

You can take a look at Compiling GCC-10.4.0 on CentOS-7 and tune to GCC-12.1.0

References:

References:

https://gcc.gnu.org/wiki/InstallingGCC