added gcc toolchain step

build/gcc/build.bash

@@ -52,7 +52,39 @@ bootstrap() {
 
 
 toolchain() {
-	echo toolchain
+	tar xf ../gmp-$GMP_VERSION.tar.xz && mv gmp-$GMP_VERSION gmp
+	tar xf ../isl-$ISL_VERSION.tar.xz && mv isl-$ISL_VERSION isl
+	tar xf ../mpc-$MPC_VERSION.tar.gz && mv mpc-$MPC_VERSION mpc
+	tar xf ../mpfr-$MPFR_VERSION.tar.xz && mv mpfr-$MPFR_VERSION mpfr
+
+	sed -e '/m64=/s/lib64/lib/' -i.orig gcc/config/i386/t-linux64
+
+	sed '/thread_header =/s/@.*@/gthr-posix.h/' -i libgcc/Makefile.in libstdc++-v3/include/Makefile.in
+
+	mkdir -p build && cd build
+
+	../configure \
+		--build=$(../config.guess) \
+		--host=$TARGET \
+		--target=$TARGET \
+		--prefix=/usr \
+		--with-build-sysroot="$SYSROOT" \
+		--enable-default-pie \
+		--enable-default-ssp \
+		--disable-nls \
+		--disable-multilib \
+		--disable-libatomic \
+		--disable-libgomp \
+		--disable-libquadmath \
+		--disable-libsanitizer \
+		--disable-libssp \
+		--disable-libvtv \
+		--enable-languages=c,c++ \
+		LDFLAGS_FOR_TARGET=-L"$PWD/$TARGET/libgcc" > /dev/null
+
+	make > /dev/null && make DESTDIR="$SYSROOT" install > /dev/null 
+
+	ln -s gcc "$SYSROOT/usr/bin/cc"
 }
 
 setup() {