#!/usr/bin/env bash

set -ex

X_ROOT=/tmp/mingw
X_DOWNLOADS=$X_ROOT/downloads
X_BUILD=$X_ROOT/build
X_DEST=$X_ROOT/dest
X_CROSS=$X_ROOT/cross
# Use all processors and collect output nicely
X_MAKE_OPTS="-j$(nproc) -O"
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"

# A helper function to setup common directory structure for each package.
#
# Source archives are downloaded to $X_DOWNLOADS. The archives are extracted
# to $X_BUILD/PKG_NAME so that sources are usually available at
# $X_BUILD/PKG_NAME/PKG_NAME-PKG_VERSION. A build directory is created at
# $X_BUILD/PKG_NAME/bld.
function prepare {
	local PKG_NAME=$1
	local PKG_VERSION=$2
	local PKG_SOURCE=$3
	local PKG_FILENAME=$4
	rm -rf $X_BUILD/$PKG_NAME
	mkdir -pv $X_DOWNLOADS $X_BUILD/$PKG_NAME
	cd $X_DOWNLOADS
	if [ ! -f $PKG_FILENAME ]; then
		wget $PKG_SOURCE
	fi
	cd $X_BUILD/$PKG_NAME
	tar xf $X_DOWNLOADS/$PKG_FILENAME
	mkdir bld
}

### BUILD THE CROSS COMPILER

prepare binutils 2.36.1 https://ftpmirror.gnu.org/binutils/binutils-2.36.1.tar.xz binutils-2.36.1.tar.xz
cd bld
../binutils-2.36.1/configure --target=x86_64-w64-mingw32 --prefix=$X_CROSS --with-sysroot=$X_CROSS \
	--disable-multilib --disable-nls --disable-shared
make $X_MAKE_OPTS all "CFLAGS=-O3" "LDFLAGS=-s"
make $X_MAKE_OPTS install

export PATH=$PATH:$X_CROSS/bin

prepare mingw-w64 9.0.0 https://sourceforge.net/projects/mingw-w64/files/mingw-w64/mingw-w64-release/mingw-w64-v9.0.0.tar.bz2 mingw-w64-v9.0.0.tar.bz2
cd bld
# We need to install headers first, so use --without-crt here.
../mingw-w64-v9.0.0/configure --host=x86_64-w64-mingw32 --prefix=$X_CROSS/x86_64-w64-mingw32 \
	--with-sysroot=$X_CROSS/x86_64-w64-mingw32 --disable-lib32 --enable-wildcard --disable-shared --without-crt
cd mingw-w64-headers
make $X_MAKE_OPTS install

[ -e $X_CROSS/mingw ] || ln -sv $X_CROSS/x86_64-w64-mingw32 $X_CROSS/mingw
mkdir -pv $X_CROSS/x86_64-w64-mingw32/lib
[ -e $X_CROSS/x86_64-w64-mingw32/lib64 ] || ln -sv $X_CROSS/x86_64-w64-mingw32/lib $X_CROSS/x86_64-w64-mingw32/lib64

prepare gcc 11.2.0 https://ftpmirror.gnu.org/gcc/gcc-11.2.0/gcc-11.2.0.tar.xz gcc-11.2.0.tar.xz
(cd gcc-11.2.0 && ./contrib/download_prerequisites --directory=$X_DOWNLOADS)
cd bld
../gcc-11.2.0/configure --enable-languages=c,c++ --target=x86_64-w64-mingw32 --disable-multilib \
	--prefix=$X_CROSS --with-sysroot=$X_CROSS --disable-libstdcxx-pch --disable-libstdcxx-verbose \
	--disable-nls --disable-shared --disable-win32-registry --enable-threads=posix --enable-libgomp
make $X_MAKE_OPTS all-gcc
make $X_MAKE_OPTS install-gcc

# Now we can build the rest of mingw-w64 (crt + winpthreads).
cd $X_BUILD/mingw-w64/bld
../mingw-w64-v9.0.0/configure --host=x86_64-w64-mingw32 --prefix=$X_CROSS/x86_64-w64-mingw32 \
	--with-sysroot=$X_CROSS/x86_64-w64-mingw32 --disable-lib32 --enable-wildcard \
	--disable-shared --with-libraries=winpthreads
make $X_MAKE_OPTS "CFLAGS=-s -O3"
make $X_MAKE_OPTS install

cd $X_BUILD/gcc/bld
make $X_MAKE_OPTS "CFLAGS=-g0 -O3" "CXXFLAGS=-g0 -O3" \
	"CFLAGS_FOR_TARGET=-g0 -O3" "CXXFLAGS_FOR_TARGET=-g0 -O3" \
	"BOOT_CFLAGS=-g0 -O3" "BOOT_CXXFLAGS=-g0 -O3"
make $X_MAKE_OPTS install

# These symlinks are not needed anymore.
rm $X_CROSS/mingw
rm $X_CROSS/x86_64-w64-mingw32/lib64

# ### BUILD THE NATIVE COMPILER

prepare binutils 2.36.1 https://ftpmirror.gnu.org/binutils/binutils-2.36.1.tar.xz binutils-2.36.1.tar.xz
cd bld
../binutils-2.36.1/configure --host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --prefix=$X_DEST \
	--with-sysroot=$X_DEST --disable-multilib --disable-nls --disable-shared
make $X_MAKE_OPTS all "CFLAGS=-O3" "LDFLAGS=-s"
make $X_MAKE_OPTS install

prepare gcc 11.2.0 https://ftpmirror.gnu.org/gcc/gcc-11.2.0/gcc-11.2.0.tar.xz gcc-11.2.0.tar.xz
(
	cd gcc-11.2.0
	./contrib/download_prerequisites --directory=$X_DOWNLOADS
	mkdir -p winsup/mingw
	cd winsup/mingw
	# Note that this needs to point to the cross compilers include directory
	[ -e include ] || ln -s $X_CROSS/x86_64-w64-mingw32/include include
)

prepare mingw-w64 9.0.0 https://sourceforge.net/projects/mingw-w64/files/mingw-w64/mingw-w64-release/mingw-w64-v9.0.0.tar.bz2 mingw-w64-v9.0.0.tar.bz2
cd bld
../mingw-w64-v9.0.0/configure --host=x86_64-w64-mingw32 --build=x86_64-w64-mingw32 \
	--prefix=$X_DEST/x86_64-w64-mingw32 --with-sysroot=$X_DEST/x86_64-w64-mingw32 \
	--disable-lib32 --enable-wildcard --disable-shared --without-crt
cd mingw-w64-headers
make $X_MAKE_OPTS
make $X_MAKE_OPTS install

[ -e $X_DEST/mingw ] || ln -s $X_DEST/x86_64-w64-mingw32 $X_DEST/mingw
[ -e $X_DEST/x86_64-w64-mingw32/lib64 ] || ln -s $X_DEST/x86_64-w64-mingw32/lib $X_DEST/x86_64-w64-mingw32/lib64

cd $X_BUILD/gcc/bld
../gcc-11.2.0/configure --enable-languages=c,c++ --host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 \
	--disable-multilib --prefix=$X_DEST --with-sysroot=$X_DEST --disable-libstdcxx-pch \
	--disable-libstdcxx-verbose --disable-nls --disable-shared --disable-win32-registry \
	--enable-threads=posix --enable-libgomp
make $X_MAKE_OPTS all-gcc
make $X_MAKE_OPTS install-gcc

cd $X_BUILD/mingw-w64/bld
../mingw-w64-v9.0.0/configure --host=x86_64-w64-mingw32 --build=x86_64-w64-mingw32 \
	--prefix=$X_DEST/x86_64-w64-mingw32 --with-sysroot=$X_DEST/x86_64-w64-mingw32 \
	--disable-lib32 --enable-wildcard --disable-shared --with-libraries=winpthreads \
	--with-tools=all
make $X_MAKE_OPTS "CFLAGS=-s -O3"
make $X_MAKE_OPTS install

cd $X_BUILD/gcc/bld
make $X_MAKE_OPTS clean
make $X_MAKE_OPTS "CFLAGS=-g0 -O3" "CXXFLAGS=-g0 -O3" "CFLAGS_FOR_TARGET=-g0 -O3" "CXXFLAGS_FOR_TARGET=-g0 -O3" "BOOT_CFLAGS=-g0 -O3" "BOOT_CXXFLAGS=-g0 -O3"
make $X_MAKE_OPTS install

# These symlinks are not needed anymore.
rm -v $X_DEST/mingw
rm -v $X_DEST/x86_64-w64-mingw32/lib64

# https://github.com/msys2/MINGW-packages/issues/7890
# https://github.com/msys2/MINGW-packages/pull/8248
rm -v $X_DEST/lib/bfd-plugins/libdep.a

### BUILD EXTRA STUFF

prepare gdb 10.2 https://ftpmirror.gnu.org/gnu/gdb/gdb-10.2.tar.xz gdb-10.2.tar.xz
# Hack around undefined reference to BCryptGenRandom by defining HAVE_LIB_BCRYPT to 0.
cp -v $SCRIPT_DIR/gdb-gnulib-import-m4-getrandom.m4 gdb-10.2/gnulib/import/m4/getrandom.m4
(cd gdb-10.2/gnulib && autoreconf --force --install --verbose)
cd bld
../gdb-10.2/configure --host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --prefix=$X_DEST --disable-nls
make $X_MAKE_OPTS "CFLAGS=-O3" "CXXFLAGS=-O3" "LDFLAGS=-s"
make $X_MAKE_OPTS install

cd $X_DEST
7zr a $X_ROOT/mingw.7z .