From 799921f0b1f5dcaf8dd2aa2f40adaf8c8490affc Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Fri, 11 Jun 2021 19:20:06 +0200
Subject: Naiive async compilation

---
 Makefile       |  2 +-
 libcppbuild.cc | 32 ++++++++++++++++++++++++++------
 2 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/Makefile b/Makefile
index 7cad9bd..d5beb15 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ libcppbuild.a: libcppbuild.cc
 	ar rcs libcppbuild.a libcppbuild.o
 
 cppbuild: cppbuild.cc libcppbuild.a
-	g++ -g -std=c++17 cppbuild.cc libcppbuild.a -o cppbuild
+	g++ -g -std=c++17 cppbuild.cc libcppbuild.a -pthread -o cppbuild
 
 clean:
 	rm -f cppbuild libcppbuild.o libcppbuild.a
diff --git a/libcppbuild.cc b/libcppbuild.cc
index ff208b3..ddc0b66 100644
--- a/libcppbuild.cc
+++ b/libcppbuild.cc
@@ -5,6 +5,8 @@
 #include <fstream>
 #include <regex>
 #include <utility>
+//#include <thread>
+#include <future>
 
 #include "libcppbuild.h"
 
@@ -102,6 +104,8 @@ int main(int argc, const char* argv[])
 	const auto& files = project.sources;
 	std::vector<std::string> objects;
 
+	std::vector<std::future<int>> tasks;
+
 	std::cout << "Building\n";
 	for(const auto& file : files)
 	{
@@ -154,12 +158,28 @@ int main(int argc, const char* argv[])
 		   std::filesystem::last_write_time(file) >
 		   std::filesystem::last_write_time(object))
 		{
-			std::string compiler = "g++ -MMD -c " + file + " -o " + object;
-			std::cout << compiler << "\n";
-			if(system(compiler.data()))
-			{
-				return 1;
-			}
+
+			tasks.emplace_back(
+				std::async(std::launch::async,
+				           [file, object]()
+				           {
+					           std::string compiler = "g++ -MMD -c " + file + " -o " + object;
+					           std::cout << compiler << "\n";
+					           if(system(compiler.data()))
+					           {
+						           return 1;
+					           }
+					           return 0;
+				           }));
+		}
+	}
+
+	for(auto& task : tasks)
+	{
+		task.wait();
+		if(task.get() != 0)
+		{
+			return 1;
 		}
 	}
 
-- 
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