sudo -i
dnf install mg
dnf upgrade
dnf install @c-development gnat gprbuild gmp-devel mpfr-devel libmpc-devel git
# you can probably drop privileges here
export PATH="$HOME/prefix/tools/bin:$HOME/prefix/stage1/bin:$HOME/prefix-$(uname -m)/bin:$PATH"
wget https://ftpmirror.gnu.org/gnu/binutils/binutils-2.46.0.tar.gz https://ftpmirror.gnu.org/gnu/gcc/gcc-15.2.0/gcc-15.2.0.tar.gz
git clone https://github.com/Jonimoose/libfxcg --depth=1
tar xf gcc-15.2.0.tar.gz
tar xf binutils-2.46.0.tar.gz

cd binutils-2.46.0
mkdir stage{0,1}
cd stage0
../configure --prefix=$HOME/prefix-$(uname -m) --sysconfdir=/etc --enable-ld=default --enable-plugins --enable-shared --disable-werror --enable-64-bit-bfd
make -j$(nproc) tooldir=$HOME/prefix-$(uname -m)
make -j$(nproc) check
make -j install-strip tooldir=$HOME/prefix-$(uname -m)

cd ../../gcc-15.2.0
mkdir stage{0,1,2}
sed -ie '/m64=/s/lib64/lib/' gcc/config/i386/t-linux64
cd stage0
../configure --prefix=$HOME/prefix-$(uname -m) LD=ld --enable-languages-c,c++,ada --enable-default-pie --enable-default-ssp --enable-host-pie --disable-multilib --disable-fixincludes
make -j$(nproc)
sed -i ../gcc/testsuite/gcc.dg/plugin/plugin.exp -e '/cpython/d'
make -j install-strip

cd ../../binutils-2.46.0/stage1
../configure --prefix=$HOME/prefix/stage1 --with-sysroot=$HOME/prefix --target=sh3eb-elf --disable-nls --disable-gprofng --disable-werror
make -j$(nproc)
make -j install-strip
../configure --prefix=$HOME/prefix/tools --with-sysroot=$HOME/prefix --target=sh3eb-elf --disable-nls --disable-gprofng --disable-werror
make -j$(nproc)
make -j install-strip

cd ../../gcc-15.2.0/stage1
../configure --target=sh3eb-elf --prefix=$HOME/prefix/stage1 --with-sysroot=$HOME/prefix --with-newlib --without-headers --enable-default-pie --enable-default-ssp --disable-nls --enable-languages=c,c++,ada --disable-libstdcxx --disable-libada --disable-libssp
make -j$(nproc)
make -j install-strip

cd ../../libfxcg
make -j$(nproc) libc/libc.a
install -Dt $HOME/prefix/lib libc/libc.a libfxcg/libfxcg.a
mkdir -p $HOME/prefix/include
cp -r include/* $HOME/prefix/include/

cd ../gcc-15.2.0/stage2
../configure --target=sh3eb-elf --prefix=$HOME/prefix/tools --with-sysroot=$HOME/prefix --enable-default-pie --disable-nls --enable-languages=c,c++,ada --with-native-system-header-dir=/include --disable-gcov --disable-libada --disable-libstdcxx --disable-libssp
make -j$(nproc)
make -j install-strip
rm -rf $HOME/prefix/stage1