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Steps to build GCC 10 on Debian Buster.
#!/bin/bash
#
# Steps to build GCC 10 on Debian Buster.
#
set -e -x
# Install all dependencies.
export DEBIAN_FRONTEND=noninteractive
apt update
apt install -y wget xz-utils bzip2 make autoconf gcc-multilib g++-multilib
# Download GCC sources.
wget https://ftp.wrz.de/pub/gnu/gcc/gcc-10.2.0/gcc-10.2.0.tar.xz
tar xf gcc-10.2.0.tar.xz
cd gcc-10.2.0
wget https://gmplib.org/download/gmp/gmp-6.2.0.tar.xz
tar xf gmp-6.2.0.tar.xz
mv gmp-6.2.0 gmp
wget https://ftp.gnu.org/gnu/mpfr/mpfr-4.1.0.tar.gz
tar xf mpfr-4.1.0.tar.gz
mv mpfr-4.1.0 mpfr
wget ftp://ftp.gnu.org/gnu/mpc/mpc-1.2.1.tar.gz
tar xf mpc-1.2.1.tar.gz
mv mpc-1.2.1 mpc
wget ftp://gcc.gnu.org/pub/gcc/infrastructure/isl-0.18.tar.bz2
tar xf isl-0.18.tar.bz2
mv isl-0.18 isl
# Build and install it.
./configure --prefix=/opt/gcc-10 --enable-languages=c,c++
make -j$(nproc)
make install
# Create an archive of the installed version.
cd /opt
tar cvJf gcc-10.2.0-debian-buster.tar.xz gcc-10
# Usage example:
#
# CC=/opt/gcc-10/bin/gcc CXX=/opt/gcc-10/bin/g++ LDFLAGS="-Wl,-rpath,/opt/gcc-10/lib64" cmake [..]
#
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