build statically linked cross gcc compiler (assumes you have downloaded the sources and prequsities for gcc)

build.sh

#!/bin/sh
set -e

TARGET=${TARGET:-"x86_64-linux-musl"}
PREFIX=${PREFIX:-"/usr/local/dev/gcc"}
CC=${CC:-"gcc"}
CXX=${CXX-"g++"}
LANGUAGES=${LANGUAGES:-"c,c++,go"}

./configure \
	--enable-languages="$LANGUAGES" \
 	--disable-nls \
  	--disable-shared \
  	--disable-host-shared \
  	--with-boot-ldflags=-static \
  	--with-stage1-ldflags=-static \
  	--disable-multilib  \
	--prefix="$PREFIX" \
	--host="$TARGET" \
	CC="$CC" CXX="$CXX"

make -j$(nproc)
make -j$(nproc) install

echo "DONE"
echo "You can find your compiled gcc executable at $PREFIX/bin/gcc".