feat: cross compilation toolchain building script (wip)

.gitignore

@@ -1,3 +1,2 @@
 /target
-toolchain/
 *.swp

cross/.gitignore

@@ -0,0 +1 @@
+toolchain/

cross/README.md

@@ -0,0 +1,3 @@
+# Cross compilation
+
+This directory contains utilities to build a toolchain to be used to cross-compile packages.

cross/build.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+set -e
+
+# If the target is not specified, set to default
+if [ -z $TARGET ]; then
+  export TARGET=i686-unknown-linux-musl
+fi
+
+# Prepare
+mkdir -p toolchain/repo
+PATH="$(pwd)/../target/release:$PATH"
+export SYSROOT="$(pwd)/toolchain/"
+export LOCAL_REPO="$(pwd)/toolchain/repo/"
+
+# binutils
+blimp-builder desc/binutils toolchain/repo/
+yes | blimp install binutils
+
+# musl
+source ./env.sh
+HOST="$TARGET" blimp-builder desc/musl toolchain/repo/
+unset CC LD CFLAGS LDFLAGS RUSTFLAGS
+yes | blimp install musl
+
+# TODO clang

cross/desc/binutils/build-hook

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+set -e
+cd *
+
+mkdir build
+cd build
+
+# Compile
+../configure \
+	--prefix=/usr \
+	--build="$BUILD" \
+	--host="$HOST" \
+	--target="$TARGET" \
+	--disable-werror \
+	--enable-64-bit-bfd
+make -j${JOBS}
+
+# Install
+make DESTDIR=$SYSROOT install -j1

cross/desc/binutils/package.json

@@ -0,0 +1,17 @@
+{
+	"sources": [
+		{
+			"location": "/",
+			"url": "https://ftp.gnu.org/gnu/binutils/binutils-2.42.tar.gz"
+		}
+	],
+	"package": {
+		"name": "binutils",
+		"version": "2.42",
+
+		"description": "The GNU Binutils are a collection of binary tools.",
+
+		"build_deps": [],
+		"run_deps": []
+	}
+}

cross/desc/musl/build-hook

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -e
+cd *
+
+# Compile
+./configure \
+	--build="$BUILD" \
+	--host="$HOST" \
+	--target="$TARGET" \
+	--prefix="/usr" \
+	--enable-optimize \
+	--enable-shared
+make -j${JOBS}
+
+# Install
+make DESTDIR=$SYSROOT install

cross/desc/musl/package.json

@@ -0,0 +1,17 @@
+{
+	"sources": [
+		{
+			"location": "/",
+			"url": "https://musl.libc.org/releases/musl-1.2.5.tar.gz"
+		}
+	],
+	"package": {
+		"name": "musl",
+		"version": "1.2.5",
+
+		"description": "musl is an implementation of the C standard library built on top of the Linux system call API, including interfaces defined in the base language standard, POSIX, and widely agreed-upon extensions.",
+
+		"build_deps": [],
+		"run_deps": []
+	}
+}

scripts/cross_compile_env.sh → cross/env.sh

@@ -1,10 +1,9 @@
-# This file contains an environment to cross-compile packages to the i686 architecture
-# The script requires the TOOLCHAIN variable to be set to the toolchain's path
+# Usage: `source env.sh`
+# `TARGET` is the target triplet for the compiler
 
-# If the target is not specified, set to default
-if [ -z $TARGET ]; then
-  export TARGET=i686-unknown-linux-musl
-fi
+TOOLCHAIN="$(pwd)/toolchain"
+
+export PATH="$TOOLCHAIN/usr/bin:$TOOLCHAIN/toolchain/bin:$PATH"
 
 export CC="clang"
 export LD="ld.lld"