Compile binutils and gcc from scratch

Turns out the alpine versione doesn't quite work well with low-level 32
bit code...

toolchain/Dockerfile

@@ -1,8 +1,8 @@
 FROM alpine
 
-RUN apk --update add make binutils gcc && \
+ADD build-toolchain.sh /opt/build-toolchain.sh
-    apk add grub-bios xorriso qemu-system-x86_64 gdb && \
+
-    rm -rf /var/cache/apk/*
+RUN /opt/build-toolchain.sh
 
 ENV PATH "/opt/toolchain:$PATH"
 ENV MITTOS64 "true"

toolchain/build-toolchain.sh

@@ -0,0 +1,46 @@
+#!/bin/sh -e
+
+apk --update add build-base
+apk add gmp-dev mpfr-dev mpc1-dev
+
+apk add make
+apk add grub-bios xorriso
+apk add qemu-system-x86_64 gdb
+
+rm -rf /var/cache/apk/*
+
+target=x86_64-elf
+binutils=binutils-2.26
+gcc=gcc-6.1.0
+
+
+cd /opt
+wget http://ftp.gnu.org/gnu/binutils/${binutils}.tar.gz
+tar -xf ${binutils}.tar.gz
+mkdir binutils-build && cd binutils-build
+../${binutils}/configure \
+  --target=${target} \
+  --disable-nls \
+  --disable-werror \
+  --with-sysroot \
+
+make
+make install
+
+cd /opt
+wget http://ftp.gnu.org/gnu/gcc/${gcc}/${gcc}.tar.gz
+tar -xf ${gcc}.tar.gz
+mkdir gcc-build && cd gcc-build
+../${gcc}/configure \
+  --target=${target} \
+  --disable-nls \
+  --enable-languages=c \
+  --without-headers \
+
+make all-gcc all-target-libgcc
+make install-gcc install-target-libgcc
+
+apk del build-base
+
+cd /
+rm -rf /opt