Split up the rakefile

rakelib/ninja.rake

@@ -0,0 +1,75 @@
+# This Source Code Form is subject to the terms of the Mozilla Public License,
+# v. 2.0. If a copy of the MPL was not distributed with this file, You can
+# obtain one at https://mozilla.org/MPL/2.0/.
+# frozen_string_literal: true
+
+require 'rake/clean'
+
+CLEAN.include 'build/boot', 'build/valid'
+
+file 'build/build.ninja' => ['build'] do |t|
+  File.open t.name, 'w' do |f|
+    f << <<~NINJA
+      builddir = build
+      cflags = -fpie -g
+
+      rule cc
+        command = gcc $cflags -nostdlib -o $out $in
+
+      rule as
+        command = gcc $cflags -c -o $out $in
+
+      rule link1
+        command = ld -o $out $in
+
+      rule link2
+        command = ld -o $out --dynamic-linker /lib32/ld-linux-riscv32-ilp32d.so.1 /usr/lib/crt1.o /usr/lib/crti.o -lc $in /usr/lib/crtn.o
+
+      rule bootstrap
+        command = $bootstrap < \$in > \$out
+    NINJA
+    f << <<~NINJA
+
+      build build/boot/stage1/cl: cc boot/stage1.s
+      build build/valid/stage1/cl.s: bootstrap boot/stage1.s | build/boot/stage1/cl
+        bootstrap = build/boot/stage1/cl
+
+      build build/valid/stage1/cl.o: as build/valid/stage1/cl.s
+      build build/valid/stage1/cl: link1 build/valid/stage1/cl.o
+    NINJA
+    STAGES.each do |stage|
+      stage_number = stage.delete_prefix('stage').to_i
+
+      arguments_path = Pathname.new('boot') + stage + 'linker.arg'
+      if arguments_path.exist?
+        link = 'link2'
+      else
+        link = 'link1'
+      end
+      boot_stage = "build/boot/stage#{stage_number}"
+      valid_stage = "build/valid/stage#{stage_number}"
+      f << <<~NINJA
+
+        build #{boot_stage}/cl.s: bootstrap boot/stage#{stage_number}/cl.elna | build/valid/stage#{stage_number.pred}/cl
+          bootstrap = build/valid/stage#{stage_number.pred}/cl
+
+        build #{boot_stage}/cl.o: as #{boot_stage}/cl.s
+        build #{boot_stage}/cl: #{link} #{boot_stage}/cl.o
+
+        build #{valid_stage}/cl.s: bootstrap boot/stage#{stage_number}/cl.elna | #{boot_stage}/cl
+          bootstrap = build/boot/stage#{stage_number}/cl
+
+        build #{valid_stage}/cl.o: as #{valid_stage}/cl.s
+        build #{valid_stage}/cl: #{link} #{valid_stage}/cl.o
+      NINJA
+    end
+    f << <<~NINJA
+
+      default build/valid/#{STAGES.last}/cl
+    NINJA
+  end
+end
+
+file "build/valid/#{STAGES.last}/cl" => 'build/build.ninja' do |t|
+  sh 'ninja', '-f', t.prerequisites.first
+end