From 87aad8c76eb2371720c9aceef7516ecb0859ecdf Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sun, 10 Oct 2021 19:02:54 +0200
Subject: Improve initial bootstrap speed.

---
 bootstrap.sh     |  6 ++--
 src/bootstrap.cc | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/tasks.cc     |  6 +++-
 3 files changed, 92 insertions(+), 3 deletions(-)
 create mode 100644 src/bootstrap.cc

diff --git a/bootstrap.sh b/bootstrap.sh
index 815c12f..fd9b605 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -1,4 +1,6 @@
 #!/bin/sh
 echo "Bootstrapping..."
-g++ -std=c++17 -O3 -Isrc -pthread src/*.cc ctor.cc test/ctor.cc -o ctor && \
-echo "Done. Now run ./ctor to build."
+g++ -std=c++17 -O3 -Isrc -pthread src/bootstrap.cc ctor.cc test/ctor.cc -o ctor && \
+./ctor && \
+g++ -std=c++17 -O3 -Isrc -pthread ctor.cc test/ctor.cc -Lbuild -lctor -o ctor && \
+echo "Done. Now run ./ctor to (re)build."
diff --git a/src/bootstrap.cc b/src/bootstrap.cc
new file mode 100644
index 0000000..9b8e029
--- /dev/null
+++ b/src/bootstrap.cc
@@ -0,0 +1,83 @@
+// -*- c++ -*-
+// Distributed under the BSD 2-Clause License.
+// See accompanying file LICENSE for details.
+#include <iostream>
+#include <array>
+
+#define BOOTSTRAP
+
+#include "libctor.h"
+#include "settings.h"
+
+#include "util.cc"
+#include "rebuild.cc"
+#include "task.cc"
+#include "task_cc.cc"
+#include "task_ar.cc"
+#include "execute.cc"
+#include "tasks.cc"
+#include "build.cc"
+
+
+std::filesystem::path configurationFile("configuration.cc");
+std::filesystem::path configHeaderFile("config.h");
+
+const std::map<std::string, std::string> default_configuration{};
+const std::map<std::string, std::string>&  configuration()
+{
+	return default_configuration;
+}
+
+bool hasConfiguration(const std::string& key)
+{
+	return false;
+}
+
+const std::string& getConfiguration(const std::string& key,
+                                    const std::string& defaultValue)
+{
+	return defaultValue;
+}
+
+int main(int argc, char* argv[])
+{
+	if(argc > 1)
+	{
+		std::cerr << "This is a minimal bootstrap version of " << argv[0] <<
+			" which doesn't support any arguments\n";
+		return 1;
+	}
+
+	Settings settings{};
+
+	settings.builddir = getConfiguration(cfg::builddir, "build");
+	settings.parallel_processes =
+		std::max(1u, std::thread::hardware_concurrency() * 2 - 1);
+	settings.verbose = 0;
+	auto all_tasks = getTasks(settings);
+	for(auto task : all_tasks)
+	{
+		if(task->registerDepTasks(all_tasks))
+		{
+			return 1;
+		}
+	}
+
+	std::vector<Target> non_unittest_targets;
+	auto& targets = getTargets(settings);
+	for(const auto& target : targets)
+	{
+		if(target.config.type != TargetType::UnitTest)
+		{
+			non_unittest_targets.push_back(target);
+		}
+	}
+
+	auto ret = build(settings, "all", non_unittest_targets, all_tasks);
+	if(ret != 0)
+	{
+		return ret;
+	}
+
+	return 0;
+}
diff --git a/src/tasks.cc b/src/tasks.cc
index 254404e..c280fb2 100644
--- a/src/tasks.cc
+++ b/src/tasks.cc
@@ -93,7 +93,7 @@ std::list<std::shared_ptr<Task>> taskFactory(const BuildConfiguration& config,
 		tasks.emplace_back(std::make_shared<TaskAR>(config, settings, config.target,
 		                                            objects, sourceDir));
 		break;
-
+#ifndef BOOTSTRAP
 	case TargetType::DynamicLibrary:
 		// TODO: Use C++20 starts_with
 		if(targetFile.stem().string().substr(0, 3) != "lib")
@@ -113,6 +113,10 @@ std::list<std::shared_ptr<Task>> taskFactory(const BuildConfiguration& config,
 
 	case TargetType::Object:
 		break;
+#else
+	default:
+		break;
+#endif
 	}
 
 	return tasks;
-- 
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