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diff --git a/src/task_so.cc b/src/task_so.cc
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+++ b/src/task_so.cc
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+#include "task_so.h"
+
+#include <iostream>
+#include <fstream>
+
+#include "libcppbuild.h"
+#include "settings.h"
+#include "execute.h"
+
+namespace
+{
+std::string readFile(const std::string &fileName)
+{
+ std::ifstream ifs(fileName.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
+
+ std::ifstream::pos_type fileSize = ifs.tellg();
+ ifs.seekg(0, std::ios::beg);
+
+ std::vector<char> bytes(fileSize);
+ ifs.read(bytes.data(), fileSize);
+
+ return std::string(bytes.data(), fileSize);
+}
+
+std::vector<std::string> addPrefix(const std::vector<std::string>& lst,
+ const Settings& settings)
+{
+ std::vector<std::string> out;
+ for(const auto& item : lst)
+ {
+ std::filesystem::path file = settings.builddir;
+ file /= item;
+ out.push_back(file.string());
+ }
+ return out;
+}
+} // namespace ::
+
+TaskSO::TaskSO(const BuildConfiguration& config,
+ const Settings& settings,
+ const std::string& target,
+ const std::vector<std::string>& objects)
+ : Task(config, addPrefix(config.depends, settings))
+ , config(config)
+ , settings(settings)
+{
+ targetFile = settings.builddir;
+ targetFile /= target;
+ for(const auto& object : objects)
+ {
+ std::filesystem::path objectFile = object;
+ objectFiles.push_back(objectFile);
+ dependsStr.push_back(objectFile.string());
+ }
+
+ for(const auto& dep : config.depends)
+ {
+ std::filesystem::path depFile = settings.builddir;
+ depFile /= dep;
+ depFiles.push_back(depFile);
+ }
+
+ flagsFile = settings.builddir / targetFile.stem();
+ flagsFile += ".flags";
+
+ target_type = TargetType::DynamicLibrary;
+ source_language = Language::C;
+ for(const auto& source : config.sources)
+ {
+ std::filesystem::path sourceFile(source);
+ if(sourceFile.extension().string() != ".c")
+ {
+ source_language = Language::Cpp;
+ }
+ }
+}
+
+bool TaskSO::dirtyInner()
+{
+ if(!std::filesystem::exists(targetFile))
+ {
+ return true;
+ }
+
+ if(!std::filesystem::exists(flagsFile))
+ {
+ return true;
+ }
+
+ for(const auto& objectFile : objectFiles)
+ {
+ if(std::filesystem::last_write_time(targetFile) <=
+ std::filesystem::last_write_time(objectFile))
+ {
+ return true;
+ }
+ }
+
+ {
+ auto lastFlags = readFile(flagsFile.string());
+ if(flagsString() != lastFlags)
+ {
+ //std::cout << "The compiler flags changed\n";
+ return true;
+ }
+ }
+
+ return false;
+}
+
+int TaskSO::runInner()
+{
+ std::string objectlist;
+ for(const auto& objectFile : objectFiles)
+ {
+ if(!objectlist.empty())
+ {
+ objectlist += " ";
+ }
+ objectlist += objectFile.string();
+ }
+
+ std::vector<std::string> args;
+
+ args.push_back("-fPIC");
+ args.push_back("-shared");
+
+ args.push_back("-o");
+ args.push_back(targetFile.string());
+
+ for(const auto& objectFile : objectFiles)
+ {
+ args.push_back(objectFile.string());
+ }
+
+ for(const auto& depFile : depFiles)
+ {
+ args.push_back(depFile.string());
+ }
+
+ for(const auto& flag : config.ldflags)
+ {
+ args.push_back(flag);
+ }
+
+ { // Write flags to file.
+ std::ofstream flagsStream(flagsFile);
+ flagsStream << flagsString();
+ }
+
+ if(settings.verbose == 0)
+ {
+ std::cout << "LD => " << targetFile.string() << "\n";
+ }
+
+ auto tool = compiler();
+ return execute(tool, args, settings.verbose > 0);
+}
+
+int TaskSO::clean()
+{
+ if(std::filesystem::exists(targetFile))
+ {
+ std::cout << "Removing " << targetFile.string() << "\n";
+ std::filesystem::remove(targetFile);
+ }
+
+ if(std::filesystem::exists(flagsFile))
+ {
+ std::cout << "Removing " << flagsFile.string() << "\n";
+ std::filesystem::remove(flagsFile);
+ }
+
+ return 0;
+}
+
+std::vector<std::string> TaskSO::depends() const
+{
+ std::vector<std::string> deps;
+ for(const auto& objectFile : objectFiles)
+ {
+ deps.push_back(objectFile.string());
+ }
+
+ for(const auto& depFile : depFiles)
+ {
+ deps.push_back(depFile.string());
+ }
+
+ return deps;
+}
+
+std::string TaskSO::target() const
+{
+ return targetFile.string();
+}
+
+std::string TaskSO::flagsString() const
+{
+ std::string flagsStr = compiler();
+ for(const auto& flag : config.ldflags)
+ {
+ flagsStr += " " + flag;
+ }
+ flagsStr += "\n";
+
+ for(const auto& dep : config.depends)
+ {
+ if(dep != config.depends[0])
+ {
+ flagsStr += " ";
+ }
+ flagsStr += dep;
+ }
+
+ return flagsStr;
+}