From ae1871ca0ffcac3e8bd337f8d8bb4e7fd6c59295 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sun, 10 Jul 2022 17:24:16 +0200
Subject: Make tools abstraction around compiler options to better support tool
 agnostic arguments.

---
 src/tools.cc | 136 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 src/tools.cc

(limited to 'src/tools.cc')

diff --git a/src/tools.cc b/src/tools.cc
new file mode 100644
index 0000000..7e8ac78
--- /dev/null
+++ b/src/tools.cc
@@ -0,0 +1,136 @@
+// -*- c++ -*-
+// Distributed under the BSD 2-Clause License.
+// See accompanying file LICENSE for details.
+#include "tools.h"
+
+#include <filesystem>
+#include <iostream>
+
+#include <cassert>
+
+ToolChain getToolChain(OutputSystem system)
+{
+	std::string compiler;
+	switch(system)
+	{
+	case OutputSystem::Host:
+		compiler = getConfiguration(cfg::host_cxx, "g++");
+		break;
+	case OutputSystem::Build:
+		compiler = getConfiguration(cfg::build_cxx, "g++");
+		break;
+	}
+
+	std::filesystem::path cc(compiler);
+	auto cc_cmd = cc.stem().string();
+
+	// Note: "g++" is a substring of "clang++" so "clang++" must be tested first.
+	if(cc_cmd.find("clang++") != std::string::npos)
+	{
+		return ToolChain::clang;
+	}
+	else if(cc_cmd.find("g++") != std::string::npos)
+	{
+		return ToolChain::gcc;
+	}
+
+	std::cerr << "Unsupported output system.\n";
+	return ToolChain::gcc;
+}
+
+namespace
+{
+std::vector<std::string> getOptionGcc(opt option, const std::string& arg)
+{
+	switch(option)
+	{
+	case opt::output:
+		return {"-o", arg};
+	case opt::debug:
+		return {"-g"};
+	case opt::strip:
+		return {"-s"};
+	case opt::warn_all:
+		return {"-Wall"};
+	case opt::warnings_as_errors:
+		return {"-Werror"};
+	case opt::generate_dep_tree:
+		return {"-MMD"};
+	case opt::no_link:
+		return {"-c"};
+	case opt::include_path:
+		return {"-I" + arg};
+	case opt::library_path:
+		return {"-L" + arg};
+	case opt::link:
+		return {"-l" + arg};
+	case opt::cpp_std:
+		return {"-std=" + arg};
+	case opt::build_shared:
+		return {"-shared"};
+	case opt::threads:
+		return {"-pthread"};
+	case opt::optimization:
+		return {"-O" + arg};
+	case opt::position_independent_code:
+		return {"-fPIC"};
+	case opt::position_independent_executable:
+		return {"-fPIE"};
+	case opt::custom:
+		return {arg};
+	}
+
+	std::cerr << "Unsupported compiler option.\n";
+	return {};
+}
+}
+
+std::vector<std::string> getOption(ToolChain tool_chain,
+                                   opt option,
+                                   const std::string& arg)
+{
+	switch(tool_chain)
+	{
+	case ToolChain::gcc:
+	case ToolChain::clang:
+		return getOptionGcc(option, arg);
+	}
+
+	std::cerr << "Unsupported tool-chain.\n";
+	return {};
+}
+
+namespace {
+std::pair<opt, std::string> getOptionGcc(const std::string& flag)
+{
+	if(flag.substr(0, 2) == "-I")
+	{
+		std::string path = flag.substr(2);
+		path.erase(0, path.find_first_not_of(' '));
+		return { opt::include_path, path };
+	}
+
+	if(flag.substr(0, 2) == "-L")
+	{
+		std::string path = flag.substr(2);
+		path.erase(0, path.find_first_not_of(' '));
+		return { opt::library_path, path };
+	}
+
+	return { opt::custom, flag };
+}
+}
+
+std::pair<opt, std::string> getOption(const std::string& flag,
+                                      ToolChain tool_chain)
+{
+	switch(tool_chain)
+	{
+	case ToolChain::gcc:
+	case ToolChain::clang:
+		return getOptionGcc(flag);
+	}
+
+	std::cerr << "Unsupported tool-chain.\n";
+	return { opt::custom, flag };
+}
-- 
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