clang

unvendor

06/build.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+
+# This is the straigthforward bootstrapping way.
+# Prepare a directory with the initial TinyCC compiler, and a ton of sources.
+# Then exec into it and let it bootstrap itself.
+
+# You can refer to the Makefile for a more refined, totally optional approach
+# with incremental builds, better build isolation etc.
+
+set -uex
+
+export NPROC=${NPROC:-${1:-1}}
+
+cp ../05/tcc-final/tcc tcc-seed
+
+if [[ ! -e tcc-seed ]]; then
+	echo 'You need to supply a statically linked TinyCC as `tcc-seed`.'
+	echo -n 'You can `./compile-tcc-seed-with-nix.sh` '
+	echo 'if you have `nix` and trust in me.'
+	exit 1
+fi
+
+# Create a stage directory
+mkdir -p stage
+
+# Download all the required source files
+./download.sh
+
+# Inject initial tcc and our scripts; pre-unpack and patch stage 1 sources,
+# in a separate file because it makes sense to run it separately sometimes.
+./seed.sh
+
+# Exec into stage1.c inside stage with env unset,
+# without network, with EUID=EGID=0 and with /dev/null being a /dev/null.
+# See helpers/chroot and helpers/chroot-inner for more explanations
+# Alternatively, you can chroot if you're not a fan of user namespaces.
+MOUNT=$(command -v mount)
+if [[ -e /run/wrappers/bin/mount.real ]]; then  # NixOS wrapper might be buggy
+	MOUNT=$(cat /run/wrappers/bin/mount.real)
+fi
+MKDIR=$(command -v mkdir)
+CHROOT=$(command -v chroot)
+
+exec env -i "NPROC=$NPROC" unshare -nrm bash -uexs <<EOF
+	$MKDIR stage/dev; :> stage/dev/null
+	$MOUNT --bind /dev/null stage/dev/null
+
+	exec $CHROOT stage \
+		/store/0-tcc-seed -I /protosrc/tinycc/include -nostdinc -nostdlib -Werror -run \
+			-DCHAINLOAD='"/recipes/all-past-stage1.sh"' \
+			/recipes/1-stage1.c
+EOF
+
+# There's no next step,
+# upon completion stage1.c will exec into recipes/all-past-stage1.sh