Split the building of the toolchain into individual shellscripts

This simplifies building the toolchain outside of docker.

build-mingw-w64.sh

@@ -0,0 +1,63 @@
+#!/bin/sh
+
+set -e
+
+if [ $# -lt 1 ]; then
+    echo $0 dest
+    exit 1
+fi
+PREFIX="$1"
+export PATH=$PREFIX/bin:$PATH
+
+: ${CORES:=4}
+: ${ARCHS:=${TOOLCHAIN_ARCHS-i686 x86_64 armv7 aarch64}}
+
+if [ ! -d mingw-w64 ]; then
+    git clone git://git.code.sf.net/p/mingw-w64/mingw-w64
+    cd mingw-w64
+    git checkout 66fab9591c250ade399e9fe91ceda239a735649c
+    cd ..
+fi
+
+cd mingw-w64
+
+if [ -z "$NOHEADERS" ]; then
+    # TODO: Only install if they have changed? Otherwise this forces the CRT
+    # to be rebuilt even if headers haven't changed. Currently set $NOHEADERS
+    # to skip this part.
+    cd mingw-w64-headers
+    for arch in $ARCHS; do
+        mkdir -p build-$arch
+        cd build-$arch
+        ../configure --host=$arch-w64-mingw32 --prefix=$PREFIX/$arch-w64-mingw32 \
+            --enable-secure-api --enable-idl --with-default-win32-winnt=0x600
+        make install
+        cd ..
+    done
+    cd ..
+fi
+
+cd mingw-w64-crt
+for arch in $ARCHS; do
+    mkdir -p build-$arch
+    cd build-$arch
+    case $arch in
+    armv7)
+        FLAGS="--disable-lib32 --disable-lib64 --enable-libarm32"
+        ;;
+    aarch64)
+        FLAGS="--disable-lib32 --disable-lib64 --enable-libarm64"
+        ;;
+    i686)
+        FLAGS="--enable-lib32 --disable-lib64"
+        ;;
+    x86_64)
+        FLAGS="--disable-lib32 --enable-lib64"
+        ;;
+    esac
+    CC=$arch-w64-mingw32-clang AR=llvm-ar RANLIB=llvm-ranlib DLLTOOL=llvm-dlltool \
+    ../configure --host=$arch-w64-mingw32 --prefix=$PREFIX/$arch-w64-mingw32 $FLAGS
+    make -j$CORES
+    make install
+    cd ..
+done