DID NOT TEST YET

build-gcc.sh

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+# Step 1. Download GCC and binutils source code
+ADACASIO_BINUTILS_URL="https://ftp.gnu.org/gnu/binutils/binutils-2.46.0.tar.gz"
+ADACASIO_GCC_URL="https://ftp.gnu.org/gnu/gcc/gcc-15.2.0/gcc-15.2.0.tar.gz"
+ADACASIO_PREFIX="$(pwd)/sysroot"
+
+# prepare configure and build enviornment
+wget -O binutils.tar.gz $ADACASIO_BINUTILS_URL
+wget -O gcc.tar.gz $ADACASIO_GCC_URL
+tar -xf binutils.tar.gz
+tar -xf gcc.tar.gz
+
+# Step 2. configure GCC and binutils
+mkdir build-binutils build-gcc $ADACASIO_PREFIX
+cd build-binutils
+../binutils-*/configure \
+  --prefix="$PREFIX" \
+  --target="sh3eb-elf" \
+  --with-multilib-list="m3,m4-nofpu" \
+  --program-prefix="sh3eb-elf-" \
+  --host="native" \
+  --disable-nls \
+  --disable-multilib \
+  --disable-shared \
+  --with-sysroot
+
+make -j$(nproc)
+
+cd ../build-gcc
+../gcc/configure \
+  --enable-languages="ada,c" \
+  --without-headers \
+  --program-prefix="sh-elf-" \
+  --enable-clocale="generic" \
+  --enable-libstdcxx-allocator \
+  --disable-threads \
+  --disable-libstdcxx-verbose \
+  --enable-cxx-flags="-fno-exceptions