#! /bin/bash

GCC_VERSION="10.2.0"
INSTALLDIR="/platform"

wget -nc https://bigsearcher.com/mirrors/gcc/releases/gcc-${GCC_VERSION}/gcc-${GCC_VERSION}.tar.gz
tar -xf gcc-${GCC_VERSION}.tar.gz

# download the prerequisites
cd gcc-${GCC_VERSION}
./contrib/download_prerequisites

# create the build directory
cd ..
mkdir gcc-build
cd gcc-build

# build
../gcc-${GCC_VERSION}/configure			\
    --prefix=${INSTALLDIR}		\
    --enable-shared			\
    --with-system-zlib			\
    --enable-threads=posix		\
    --enable-__cxa_atexit		\
    --enable-clocale=gnu		\
    --disable-multilib			\
    --disable-multiarch			\
    --enable-languages="c"		\
&& make -j8				\
&& make install


# Notes
#
#   --enable-shared --enable-threads=posix --enable-__cxa_atexit:
#       These parameters are required to build the C++ libraries to published standards.
#
#   --enable-clocale=gnu:
#       This parameter is a failsafe for incomplete locale data.
#
#   --disable-multilib:
#       This parameter ensures that files are created for the specific
#       architecture of your computer.
#        This will disable building 32-bit support on 64-bit systems where the
#        32 bit version of libc is not installed and you do not want to go
#        through the trouble of building it. Diagnosis: "Compiler build fails
#        with fatal error: gnu/stubs-32.h: No such file or directory"
#
#   --with-system-zlib:
#       Uses the system zlib instead of the bundled one. zlib is used for
#       compressing and uncompressing GCC's intermediate language in LTO (Link
#       Time Optimization) object files.
#
#   --enable-languages=all
#   --enable-languages=c,c++,fortran,go,objc,obj-c++:
#       This command identifies which languages to build. You may modify this
#       command to remove undesired language