1 files changed, 48 insertions, 0 deletions
diff --git a/tasks/presym.rake b/tasks/presym.rake
new file mode 100644
index 000000000..1ebc1a737
--- /dev/null
+++ b/tasks/presym.rake
@@ -0,0 +1,48 @@
+all_prerequisites = ->(task_name, prereqs) do
+  Rake::Task[task_name].prerequisites.each do |prereq_name|
+    next if prereqs[prereq_name]
+    prereqs[prereq_name] = true
+    all_prerequisites.(Rake::Task[prereq_name].name, prereqs)
+  end
+end
+
+MRuby.each_target do |build|
+  gensym_task = task(:gensym)
+  next unless build.presym_enabled?
+
+  presym = build.presym
+
+  include_dir = "#{build.build_dir}/include"
+  build.compilers.each{|c| c.include_paths << include_dir}
+  build.gems.each{|gem| gem.compilers.each{|c| c.include_paths << include_dir}}
+
+  prereqs = {}
+  ppps = []
+  build_dir = "#{build.build_dir}/"
+  mrbc_build_dir = "#{build.mrbc_build.build_dir}/" if build.mrbc_build
+  build.products.each{|product| all_prerequisites.(product, prereqs)}
+  prereqs.each_key do |prereq|
+    next unless File.extname(prereq) == build.exts.object
+    next unless prereq.start_with?(build_dir)
+    next if mrbc_build_dir && prereq.start_with?(mrbc_build_dir)
+    ppp = prereq.ext(build.exts.presym_preprocessed)
+    if Rake.application.lookup(ppp) ||
+       Rake.application.enhance_with_matching_rule(ppp)
+      ppps << ppp
+    end
+  end
+
+  file presym.list_path => ppps do
+    presyms = presym.scan(ppps)
+    current_presyms = presym.read_list if File.exist?(presym.list_path)
+    update = presyms != current_presyms
+    presym.write_list(presyms) if update
+    mkdir_p presym.header_dir
+    %w[id table].each do |type|
+      next if !update && File.exist?(presym.send("#{type}_header_path"))
+      presym.send("write_#{type}_header", presyms)
+    end
+  end
+
+  gensym_task.enhance([presym.list_path])
+end