Make sure libctor itself is built in the 'build' system and not 'host' system. Only detect tooling for the system/tools actually required in the tasks.

10 files changed, 284 insertions, 492 deletions

diff --git a/ctor.cc b/ctor.cc
index b2513af..d0d53d8 100644
--- a/ctor.cc
+++ b/ctor.cc
@@ -10,6 +10,7 @@ ctor::build_configurations ctorConfigs(const ctor::settings& settings)
 	return
 	{
 		{
+			.system = ctor::output_system::build,
 			.target = "libctor.a",
 			.sources = {
 				"src/build.cc",
diff --git a/src/bootstrap.cc b/src/bootstrap.cc
index bb2d45f..55bd3e0 100644
--- a/src/bootstrap.cc
+++ b/src/bootstrap.cc
@@ -28,7 +28,7 @@ const ctor::configuration& ctor::get_configuration()
 	static bool initialised{false};
 	if(!initialised)
 	{
-		cfg.host_toolchain = getToolChain(cfg.get(ctor::cfg::host_cxx, "/usr/bin/g++"));
+		cfg.build_toolchain = getToolChain(cfg.get(ctor::cfg::build_cxx, "/usr/bin/g++"));
 		initialised = true;
 	}
 
@@ -42,13 +42,25 @@ bool ctor::configuration::has(const std::string& key) const
 
 const std::string& ctor::configuration::get(const std::string& key, const std::string& default_value) const
 {
-	if(key == ctor::cfg::host_cxx && std::getenv("CXX"))
+	if(key == ctor::cfg::build_cxx && std::getenv("CXX"))
 	{
 		static std::string s = std::getenv("CXX");
 		return s;
 	}
 
-	if(key == ctor::cfg::host_ar && std::getenv("AR"))
+	if(key == ctor::cfg::build_cc && std::getenv("CC"))
+	{
+		static std::string s = std::getenv("CC");
+		return s;
+	}
+
+	if(key == ctor::cfg::build_ld && std::getenv("LD"))
+	{
+		static std::string s = std::getenv("LD");
+		return s;
+	}
+
+	if(key == ctor::cfg::build_ar && std::getenv("AR"))
 	{
 		static std::string s = std::getenv("AR");
 		return s;
diff --git a/src/configure.cc b/src/configure.cc
index b4829ac..c08ed88 100644
--- a/src/configure.cc
+++ b/src/configure.cc
@@ -30,7 +30,7 @@ const ctor::configuration& __attribute__((weak)) ctor::get_configuration()
 	static bool initialised{false};
 	if(!initialised)
 	{
-		cfg.host_toolchain = getToolChain(cfg.get(ctor::cfg::host_cxx, "g++"));
+		cfg.build_toolchain = getToolChain(cfg.get(ctor::cfg::build_cxx, "/usr/bin/g++"));
 		initialised = true;
 	}
 	return cfg;
@@ -374,31 +374,101 @@ int regenerateCache(ctor::settings& settings,
 	}
 
 	auto tasks = getTasks(settings, {}, false);
-/*
-	bool needs_cpp{false};
-	bool needs_c{false};
-	bool needs_ar{false};
-	bool needs_asm{false};
+
+	bool needs_build{true}; // we always need to compile ctor itself
+	bool needs_build_c{false};
+	bool needs_build_cxx{true}; // we always need to compile ctor itself
+	bool needs_build_ld{true}; // we always need to compile ctor itself
+	bool needs_build_ar{false};
+	bool needs_build_asm{false};
+
+	bool needs_host_c{false};
+	bool needs_host{false};
+	bool needs_host_cxx{false};
+	bool needs_host_ld{false};
+	bool needs_host_ar{false};
+	bool needs_host_asm{false};
+
 	for(const auto& task :tasks)
 	{
-		switch(task->sourceLanguage())
+		switch(task->outputSystem())
 		{
-		case Language::Auto:
-			std::cerr << "TargetLanguage not deduced!\n";
-			exit(1);
-			break;
-		case Language::C:
-			needs_cpp = false;
-			break;
-		case Language::Cpp:
-			needs_c = true;
+		case ctor::output_system::build:
+			needs_build = true;
+			switch(task->targetType())
+			{
+			case ctor::target_type::executable:
+			case ctor::target_type::unit_test:
+			case ctor::target_type::dynamic_library:
+				needs_build_ld = true;
+				break;
+			case ctor::target_type::static_library:
+			case ctor::target_type::unit_test_library:
+				needs_build_ar = true;
+				break;
+			case ctor::target_type::object:
+				switch(task->sourceLanguage())
+				{
+				case ctor::language::automatic:
+					std::cerr << "TargetLanguage not deduced!\n";
+					exit(1);
+					break;
+				case ctor::language::c:
+					needs_build_c = true;
+					break;
+				case ctor::language::cpp:
+					needs_build_cxx = true;
+					break;
+				case ctor::language::assembler:
+					needs_build_asm = true;
+					break;
+				}
+				break;
+			case ctor::target_type::function:
+			case ctor::target_type::automatic:
+			case ctor::target_type::unknown:
+				break;
+			}
 			break;
-		case Language::Asm:
-			needs_asm = true;
+		case ctor::output_system::host:
+			needs_host = true;
+			switch(task->targetType())
+			{
+			case ctor::target_type::executable:
+			case ctor::target_type::unit_test:
+			case ctor::target_type::dynamic_library:
+				needs_host_ld = true;
+				break;
+			case ctor::target_type::static_library:
+			case ctor::target_type::unit_test_library:
+				needs_host_ar = true;
+				break;
+			case ctor::target_type::object:
+				switch(task->sourceLanguage())
+				{
+				case ctor::language::automatic:
+					std::cerr << "TargetLanguage not deduced!\n";
+					exit(1);
+					break;
+				case ctor::language::c:
+					needs_host_c = true;
+					break;
+				case ctor::language::cpp:
+					needs_host_cxx = true;
+					break;
+				case ctor::language::assembler:
+					needs_host_asm = true;
+					break;
+				}
+				break;
+			case ctor::target_type::function:
+			case ctor::target_type::automatic:
+			case ctor::target_type::unknown:
+				break;
+			}
 			break;
 		}
 	}
-*/
 
 	auto cc_env = env.find("CC");
 	if(cc_env != env.end())
@@ -432,94 +502,141 @@ int regenerateCache(ctor::settings& settings,
 		paths = get_paths(path_env->second);
 	}
 
-	// Host detection
-	auto host_cc = locate(cc_prog, paths, host_arch_prefix);
-	if(host_cc.empty())
+	std::string host_cc;
+	std::string host_cxx;
+	std::string host_ld;
+	std::string host_ar;
+	ctor::toolchain host_toolchain{ctor::toolchain::none};
+	ctor::arch host_arch{ctor::arch::unknown};
+	if(needs_host)
 	{
-		std::cerr << "Could not locate host_cc prog" << std::endl;
-		return 1;
-	}
+		// Host detection
+		if(needs_host_c)
+		{
+			host_cc = locate(cc_prog, paths, host_arch_prefix);
+			if(host_cc.empty())
+			{
+				std::cerr << "Could not locate host_cc prog" << std::endl;
+				return 1;
+			}
+		}
 
-	auto host_cxx = locate(cxx_prog, paths, host_arch_prefix);
-	if(host_cxx.empty())
-	{
-		std::cerr << "Could not locate host_cxx prog" << std::endl;
-		return 1;
-	}
+		if(needs_host_cxx)
+		{
+			host_cxx = locate(cxx_prog, paths, host_arch_prefix);
+			if(host_cxx.empty())
+			{
+				std::cerr << "Could not locate host_cxx prog" << std::endl;
+				return 1;
+			}
+		}
 
-	auto host_ar = locate(ar_prog, paths, host_arch_prefix);
-	if(host_ar.empty())
-	{
-		std::cerr << "Could not locate host_ar prog" << std::endl;
-		return 1;
-	}
+		if(needs_host_ar)
+		{
+			host_ar = locate(ar_prog, paths, host_arch_prefix);
+			if(host_ar.empty())
+			{
+				std::cerr << "Could not locate host_ar prog" << std::endl;
+				return 1;
+			}
+		}
 
-	auto host_ld = locate(ld_prog, paths, host_arch_prefix);
-	if(host_ld.empty())
-	{
-		std::cerr << "Could not locate host_ld prog" << std::endl;
-		return 1;
-	}
+		if(needs_host_ld)
+		{
+			host_ld = locate(ld_prog, paths, host_arch_prefix);
+			if(host_ld.empty())
+			{
+				std::cerr << "Could not locate host_ld prog" << std::endl;
+				return 1;
+			}
+		}
 
-	auto host_toolchain = getToolChain(host_cxx);
-	auto host_arch_str = get_arch(ctor::output_system::host);
-	auto host_arch = get_arch(ctor::output_system::host, host_arch_str);
+		if(needs_host_asm)
+		{
+			// TODO
+		}
 
-	std::cout << "** Host architecture '" << host_arch_str << "': " << host_arch << std::endl;
+		host_toolchain = getToolChain(host_cxx);
+		auto host_arch_str = get_arch(ctor::output_system::host);
+		host_arch = get_arch(ctor::output_system::host, host_arch_str);
 
-	if(host_arch == ctor::arch::unknown)
-	{
-		std::cerr << "Could not detect host architecture" << std::endl;
-		return 1;
-	}
+		std::cout << "** Host architecture '" << host_arch_str << "': " << host_arch << std::endl;
 
-	// Build detection
-	auto build_cc = locate(cc_prog, paths, build_arch_prefix);
-	if(build_cc.empty())
-	{
-		std::cerr << "Could not locate build_cc prog" << std::endl;
-		return 1;
+		if(host_arch == ctor::arch::unknown)
+		{
+			std::cerr << "Could not detect host architecture" << std::endl;
+			return 1;
+		}
 	}
 
-	auto build_cxx = locate(cxx_prog, paths, build_arch_prefix);
-	if(build_cxx.empty())
+	std::string build_cc;
+	std::string build_cxx;
+	std::string build_ld;
+	std::string build_ar;
+	ctor::toolchain build_toolchain{ctor::toolchain::none};
+	ctor::arch build_arch{ctor::arch::unknown};
+	if(needs_build)
 	{
-		std::cerr << "Could not locate build_cxx prog" << std::endl;
-		return 1;
-	}
+		// Build detection
+		if(needs_build_c)
+		{
+			build_cc = locate(cc_prog, paths, build_arch_prefix);
+			if(build_cc.empty())
+			{
+				std::cerr << "Could not locate build_cc prog" << std::endl;
+				return 1;
+			}
+		}
 
-	auto build_ar = locate(ar_prog, paths, build_arch_prefix);
-	if(build_ar.empty())
-	{
-		std::cerr << "Could not locate build_ar prog" << std::endl;
-		return 1;
-	}
+		if(needs_build_cxx)
+		{
+			build_cxx = locate(cxx_prog, paths, build_arch_prefix);
+			if(build_cxx.empty())
+			{
+				std::cerr << "Could not locate build_cxx prog" << std::endl;
+				return 1;
+			}
+		}
 
-	auto build_ld = locate(ld_prog, paths, build_arch_prefix);
-	if(build_ld.empty())
-	{
-		std::cerr << "Could not locate build_ld prog" << std::endl;
-		return 1;
-	}
+		if(needs_build_ar)
+		{
+			build_ar = locate(ar_prog, paths, build_arch_prefix);
+			if(build_ar.empty())
+			{
+				std::cerr << "Could not locate build_ar prog" << std::endl;
+				return 1;
+			}
+		}
 
-	auto build_toolchain = getToolChain(build_cxx);
-	auto build_arch_str = get_arch(ctor::output_system::build);
-	auto build_arch = get_arch(ctor::output_system::build, build_arch_str);
+		if(needs_build_ld)
+		{
+			build_ld = locate(ld_prog, paths, build_arch_prefix);
+			if(build_ld.empty())
+			{
+				std::cerr << "Could not locate build_ld prog" << std::endl;
+				return 1;
+			}
+		}
 
-	std::cout << "** Build architecture '" << build_arch_str << "': " << build_arch << std::endl;
+		if(needs_build_asm)
+		{
+			// TODO
+		}
 
-	if(build_arch == ctor::arch::unknown)
-	{
-		std::cerr << "Could not detect build architecture" << std::endl;
-		return 1;
-	}
+		build_toolchain = getToolChain(build_cxx);
+		auto build_arch_str = get_arch(ctor::output_system::build);
+		build_arch = get_arch(ctor::output_system::build, build_arch_str);
 
-	if(!host_cxx.empty())
-	{
-		// This is needed for bootstrapping (when running configure for the first time)
-		ctor::conf_values[ctor::cfg::host_cxx] = host_cxx;
+		std::cout << "** Build architecture '" << build_arch_str << "': " << build_arch << std::endl;
+
+		if(build_arch == ctor::arch::unknown)
+		{
+			std::cerr << "Could not detect build architecture" << std::endl;
+			return 1;
+		}
 	}
 
+
 	// Store current values for execution in this execution context.
 	if(!ctor_includedir.empty())
 	{
@@ -544,10 +661,16 @@ int regenerateCache(ctor::settings& settings,
 		istr << "{\n";
 		istr << "	static ctor::configuration cfg =\n";
 		istr << "	{\n";
-		istr << "		.host_toolchain = " << host_toolchain << ",\n";
-		istr << "		.host_arch = " << host_arch << ",\n";
-		istr << "		.build_toolchain = " << build_toolchain << ",\n";
-		istr << "		.build_arch = " << build_arch << ",\n";
+		if(needs_host)
+		{
+			istr << "		.host_toolchain = " << host_toolchain << ",\n";
+			istr << "		.host_arch = " << host_arch << ",\n";
+		}
+		if(needs_build)
+		{
+			istr << "		.build_toolchain = " << build_toolchain << ",\n";
+			istr << "		.build_arch = " << build_arch << ",\n";
+		}
 		istr << "		.args = {";
 		for(const auto& arg : args)
 		{
@@ -567,14 +690,44 @@ int regenerateCache(ctor::settings& settings,
 			istr << "			{ \"" << ctor::cfg::builddir << "\", \"" << esc(builddir) << "\" },\n";
 			ctor::builddir = builddir;
 		}
-		istr << "			{ \"" << ctor::cfg::host_cc << "\", \"" << esc(host_cc) << "\" },\n";
-		istr << "			{ \"" << ctor::cfg::host_cxx << "\", \"" << esc(host_cxx) << "\" },\n";
-		istr << "			{ \"" << ctor::cfg::host_ar << "\", \"" << esc(host_ar) << "\" },\n";
-		istr << "			{ \"" << ctor::cfg::host_ld << "\", \"" << esc(host_ld) << "\" },\n";
-		istr << "			{ \"" << ctor::cfg::build_cc << "\", \"" << esc(build_cc) << "\" },\n";
-		istr << "			{ \"" << ctor::cfg::build_cxx << "\", \"" << esc(build_cxx) << "\" },\n";
-		istr << "			{ \"" << ctor::cfg::build_ar << "\", \"" << esc(build_ar) << "\" },\n";
-		istr << "			{ \"" << ctor::cfg::build_ld << "\", \"" << esc(build_ld) << "\" },\n";
+		if(needs_host)
+		{
+			if(needs_host_c)
+			{
+				istr << "			{ \"" << ctor::cfg::host_cc << "\", \"" << esc(host_cc) << "\" },\n";
+			}
+			if(needs_host_cxx)
+			{
+				istr << "			{ \"" << ctor::cfg::host_cxx << "\", \"" << esc(host_cxx) << "\" },\n";
+			}
+			if(needs_host_ar)
+			{
+				istr << "			{ \"" << ctor::cfg::host_ar << "\", \"" << esc(host_ar) << "\" },\n";
+			}
+			if(needs_host_ld)
+			{
+				istr << "			{ \"" << ctor::cfg::host_ld << "\", \"" << esc(host_ld) << "\" },\n";
+			}
+		}
+		if(needs_build)
+		{
+			if(needs_build_c)
+			{
+				istr << "			{ \"" << ctor::cfg::build_cc << "\", \"" << esc(build_cc) << "\" },\n";
+			}
+			if(needs_build_cxx)
+			{
+				istr << "			{ \"" << ctor::cfg::build_cxx << "\", \"" << esc(build_cxx) << "\" },\n";
+			}
+			if(needs_build_ar)
+			{
+				istr << "			{ \"" << ctor::cfg::build_ar << "\", \"" << esc(build_ar) << "\" },\n";
+			}
+			if(needs_build_ld)
+			{
+				istr << "			{ \"" << ctor::cfg::build_ld << "\", \"" << esc(build_ld) << "\" },\n";
+			}
+		}
 		if(!ctor_includedir.empty())
 		{
 			istr << "			{ \"" << ctor::cfg::ctor_includedir << "\", \"" << esc(ctor_includedir) << "\" },\n";
diff --git a/src/configure.cc.bak b/src/configure.cc.bak
deleted file mode 100644
index bcbeea9..0000000
--- a/src/configure.cc.bak
+++ /dev/null
@@ -1,387 +0,0 @@
-// -*- c++ -*-
-// Distributed under the BSD 2-Clause License.
-// See accompanying file LICENSE for details.
-#include "configure.h"
-
-#include <iostream>
-#include <filesystem>
-#include <fstream>
-
-#include <getoptpp/getoptpp.hpp>
-
-#include "settings.h"
-#include "execute.h"
-#include "libcppbuild.h"
-#include "tasks.h"
-
-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>& __attribute__((weak)) configuration()
-{
-	return default_configuration;
-}
-
-bool hasConfiguration(const std::string& key)
-{
-	const auto& c = configuration();
-	return c.find(key) != c.end();
-}
-
-const std::string& getConfiguration(const std::string& key,
-                                    const std::string& defaultValue)
-{
-	const auto& c = configuration();
-	if(hasConfiguration(key))
-	{
-		return c.at(key);
-	}
-
-	return defaultValue;
-}
-
-
-/*
-Configuration:
-  -h, --help              display this help and exit
-      --help=short        display options specific to this package
-      --help=recursive    display the short help of all the included packages
-  -V, --version           display version information and exit
-  -q, --quiet, --silent   do not print `checking ...' messages
-      --cache-file=FILE   cache test results in FILE [disabled]
-  -C, --config-cache      alias for `--cache-file=config.cache'
-  -n, --no-create         do not create output files
-      --srcdir=DIR        find the sources in DIR [configure dir or `..']
-
-Installation directories:
-  --prefix=PREFIX         install architecture-independent files in PREFIX
-                          [/usr/local]
-  --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
-                          [PREFIX]
-
-By default, `make install' will install all the files in
-`/usr/local/bin', `/usr/local/lib' etc.  You can specify
-an installation prefix other than `/usr/local' using `--prefix',
-for instance `--prefix=$HOME'.
-
-For better control, use the options below.
-
-Fine tuning of the installation directories:
-  --bindir=DIR            user executables [EPREFIX/bin]
-  --sbindir=DIR           system admin executables [EPREFIX/sbin]
-  --libexecdir=DIR        program executables [EPREFIX/libexec]
-  --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
-  --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
-  --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
-  --libdir=DIR            object code libraries [EPREFIX/lib]
-  --includedir=DIR        C header files [PREFIX/include]
-  --oldincludedir=DIR     C header files for non-gcc [/usr/include]
-  --datarootdir=DIR       read-only arch.-independent data root [PREFIX/share]
-  --datadir=DIR           read-only architecture-independent data [DATAROOTDIR]
-  --infodir=DIR           info documentation [DATAROOTDIR/info]
-  --localedir=DIR         locale-dependent data [DATAROOTDIR/locale]
-  --mandir=DIR            man documentation [DATAROOTDIR/man]
-  --docdir=DIR            documentation root [DATAROOTDIR/doc/drumgizmo]
-  --htmldir=DIR           html documentation [DOCDIR]
-  --dvidir=DIR            dvi documentation [DOCDIR]
-  --pdfdir=DIR            pdf documentation [DOCDIR]
-  --psdir=DIR             ps documentation [DOCDIR]
-
-Program names:
-  --program-prefix=PREFIX            prepend PREFIX to installed program names
-  --program-suffix=SUFFIX            append SUFFIX to installed program names
-  --program-transform-name=PROGRAM   run sed PROGRAM on installed program names
-
-System types:
-  --build=BUILD     configure for building on BUILD [guessed]
-  --host=HOST       cross-compile to build programs to run on HOST [BUILD]
-
-Optional Features:
-  --disable-option-checking  ignore unrecognized --enable/--with options
-  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
-  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
-  --enable-silent-rules   less verbose build output (undo: "make V=1")
-  --disable-silent-rules  verbose build output (undo: "make V=0")
-  --enable-dependency-tracking
-                          do not reject slow dependency extractors
-  --disable-dependency-tracking
-                          speeds up one-time build
-  --enable-shared[=PKGS]  build shared libraries [default=yes]
-  --enable-static[=PKGS]  build static libraries [default=yes]
-  --enable-fast-install[=PKGS]
-                          optimize for fast installation [default=yes]
-  --disable-libtool-lock  avoid locking (might break parallel builds)
-  --disable-largefile     omit support for large files
-  --enable-gui=backend    Use specified gui backend. Can be x11, win32, cocoa,
-                          pugl-x11, pugl-win32, pugl-cocoa or auto
-                          [default=auto]
-  --enable-custom-channel-count=count
-                          Compile with specified number of output channels
-                          [default=16]
-  --enable-lv2            Compile the LV2 plugin [default=no]
-  --enable-vst            Compile the VST plugin [default=no]
-  --enable-cli            Compile the command line interface [default=yes]
-  --disable-input-dummy   Disable input dummy plugin [default=enabled]
-  --disable-input-test    Disable input test plugin [default=enabled]
-  --disable-input-jackmidi
-                          Disable input jackmidi plugin [default=enabled]
-  --disable-input-alsamidi
-                          Disable input alsamidi plugin [default=enabled]
-  --disable-input-midifile
-                          Disable input midifile plugin [default=enabled]
-  --disable-input-oss     Disable input oss plugin [enabled by default on
-                          FreeBSD, disabled otherwise]
-  --disable-output-dummy  Disable output dummy plugin [default=enabled]
-  --disable-output-jackaudio
-                          Disable output jack plugin [default=enabled]
-  --disable-output-alsa   Disable output alsa plugin [default=enabled]
-  --disable-output-wavfile
-                          Disable output wavfile plugin [default=enabled]
-  --disable-output-oss    Disable output oss plugin [enabled by default on
-                          FreeBSD, disabled otherwise]
-  --enable-sse=level      Enable SSE Level 1, 2, 3 or auto [default=auto]
-
-Optional Packages:
-  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
-  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
-  --with-pic[=PKGS]       try to use only PIC/non-PIC objects [default=use
-                          both]
-  --with-aix-soname=aix|svr4|both
-                          shared library versioning (aka "SONAME") variant to
-                          provide on AIX, [default=aix].
-  --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
-  --with-sysroot[=DIR]    Search for dependent libraries within DIR (or the
-                          compiler's sysroot if not specified).
-  --with-debug            Build with debug support
-  --with-nls              Build with nls support (default nls enabled)
-  --with-test             Build unit tests
-  --with-lv2dir=DIR       Use DIR as the lv2 plugin directory
-                          [default=LIBDIR/lv2]
-  --with-vst-sources      Point this to the vstsdk24 directory
-
-Some influential environment variables:
-  CXX         C++ compiler command
-  CXXFLAGS    C++ compiler flags
-  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
-              nonstandard directory <lib dir>
-  LIBS        libraries to pass to the linker, e.g. -l<library>
-  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
-              you have headers in a nonstandard directory <include dir>
-  OBJC        Objective C compiler command
-  OBJCFLAGS   Objective C compiler flags
-  OBJCXX      Objective C++ compiler command
-  OBJCXXFLAGS Objective C++ compiler flags
-  CC          C compiler command
-  CFLAGS      C compiler flags
-  LT_SYS_LIBRARY_PATH
-              User-defined run-time library search path.
-  CPP         C preprocessor
-  CXXCPP      C++ preprocessor
-  PKG_CONFIG  path to pkg-config utility
-  PKG_CONFIG_PATH
-              directories to add to pkg-config's search path
-  PKG_CONFIG_LIBDIR
-              path overriding pkg-config's built-in search path
-  X11_CFLAGS  C compiler flags for X11, overriding pkg-config
-  X11_LIBS    linker flags for X11, overriding pkg-config
-  XEXT_CFLAGS C compiler flags for XEXT, overriding pkg-config
-  XEXT_LIBS   linker flags for XEXT, overriding pkg-config
-  LV2_CFLAGS  C compiler flags for LV2, overriding pkg-config
-  LV2_LIBS    linker flags for LV2, overriding pkg-config
-  SMF_CFLAGS  C compiler flags for SMF, overriding pkg-config
-  SMF_LIBS    linker flags for SMF, overriding pkg-config
-  SNDFILE_CFLAGS
-              C compiler flags for SNDFILE, overriding pkg-config
-  SNDFILE_LIBS
-              linker flags for SNDFILE, overriding pkg-config
-  JACK_CFLAGS C compiler flags for JACK, overriding pkg-config
-  JACK_LIBS   linker flags for JACK, overriding pkg-config
-  ALSA_CFLAGS C compiler flags for ALSA, overriding pkg-config
-  ALSA_LIBS   linker flags for ALSA, overriding pkg-config
-
-Use these variables to override the choices made by `configure' or to help
-it to find libraries and programs with nonstandard names/locations.
-
-Report bugs to the package provider.
-*/
-int configure(int argc, char* argv[])
-{
-	Settings settings;
-
-	settings.builddir = "build";
-
-	std::string cmd_str;
-	for(int i = 0; i < argc; ++i)
-	{
-		if(i > 0)
-		{
-			cmd_str += " ";
-		}
-		cmd_str += argv[i];
-	}
-
-	dg::Options opt;
-	int key{256};
-
-	std::string build_arch;
-	std::string build_path;
-	std::string host_arch;
-	std::string host_path;
-
-	opt.add("build-dir", required_argument, 'b',
-	        "Set output directory for build files (default: '" +
-	        settings.builddir + "').",
-	        [&]() {
-		        settings.builddir = optarg;
-		        return 0;
-	        });
-
-	opt.add("verbose", no_argument, 'v',
-	        "Be verbose. Add multiple times for more verbosity.",
-	        [&]() {
-		        settings.verbose++;
-		        return 0;
-	        });
-
-	opt.add("build", required_argument, key++,
-	        "Configure for building on specified architecture.",
-	        [&]() {
-		        build_arch = optarg;
-		        return 0;
-	        });
-
-	opt.add("build-path", required_argument, key++,
-	        "Set path to build tool-chain.",
-	        [&]() {
-		        build_path = optarg;
-		        return 0;
-	        });
-
-	opt.add("host", required_argument, key++,
-	        "Cross-compile to build programs to run on specified architecture.",
-	        [&]() {
-		        host_arch = optarg;
-		        return 0;
-	        });
-
-	opt.add("host-path", required_argument, key++,
-	        "Set path to cross-compile tool-chain.",
-	        [&]() {
-		        host_path = optarg;
-		        return 0;
-	        });
-
-	opt.add("help", no_argument, 'h',
-	        "Print this help text.",
-	        [&]() {
-		        std::cout << "configure usage stuff\n";
-		        opt.help();
-		        exit(0);
-		        return 0;
-	        });
-
-	opt.process(argc, argv);
-
-	if(host_arch.empty())
-	{
-		host_arch = build_arch;
-	}
-
-	auto tasks = getTasks(settings);
-
-	bool needs_cpp{false};
-	bool needs_c{false};
-	bool needs_ar{false};
-	bool needs_asm{false};
-	for(const auto& task :tasks)
-	{
-		switch(task->sourceLanguage())
-		{
-		case Language::Auto:
-			std::cerr << "TargetLanguage not deduced!\n";
-			exit(1);
-			break;
-		case Language::C:
-			needs_cpp = false;
-			break;
-		case Language::Cpp:
-			needs_c = true;
-			break;
-		case Language::Asm:
-			needs_asm = true;
-			break;
-		}
-	}
-
-	// CC=clang
-	// CXX=clang++
-
-	std::string path_env = std::getenv("PATH");
-	std::cout << path_env << "\n";
-
-	std::vector<std::string> paths;
-
-	{
-		std::stringstream ss(path_env);
-		std::string path;
-		while (std::getline(ss, path, ':'))
-		{
-			paths.push_back(path);
-		}
-	}
-	for(const auto& path_str : paths)
-	{
-		std::filesystem::path path(path_str);
-		auto gcc = path / "gcc";
-		if(std::filesystem::exists(gcc))
-		{
-			std::cout << "Found file gcc in path: " << path << "\n";
-			auto perms = std::filesystem::status(gcc).permissions();
-			if((perms & std::filesystem::perms::owner_exec) != std::filesystem::perms::none)
-			{
-				std::cout << " - executable by owner\n";
-			}
-			if((perms & std::filesystem::perms::group_exec) != std::filesystem::perms::none)
-			{
-				std::cout << " - executable by group\n";
-			}
-			if((perms & std::filesystem::perms::others_exec) != std::filesystem::perms::none)
-			{
-				std::cout << " - executable by others\n";
-			}
-		}
-	}
-	exit(0);
-
-	{
-		std::ofstream istr(configurationFile);
-		istr << "#include \"libcppbuild.h\"\n\n";
-		istr << "const std::map<std::string, std::string>& configuration()\n";
-		istr << "{\n";
-		istr << "	static std::map<std::string, std::string> c =\n";
-		istr << "	{\n";
-		istr << "		{ \"cmd\", \"" << cmd_str << "\" },\n";
-		istr << "		{ \"" << cfg::builddir << "\", \"" << settings.builddir << "\" },\n";
-		istr << "		{ \"" << cfg::target_cc << "\", \"/usr/bin/gcc\" },\n";
-		istr << "		{ \"" << cfg::target_cpp << "\", \"/usr/bin/g++\" },\n";
-		istr << "		{ \"" << cfg::target_ar << "\", \"/usr/bin/ar\" },\n";
-		istr << "		{ \"" << cfg::target_ld << "\", \"/usr/bin/ld\" },\n";
-		istr << "		{ \"" << cfg::host_cc << "\", \"/usr/bin/gcc\" },\n";
-		istr << "		{ \"" << cfg::host_cpp << "\", \"/usr/bin/g++\" },\n";
-		istr << "		{ \"" << cfg::host_ar << "\", \"/usr/bin/ar\" },\n";
-		istr << "		{ \"" << cfg::host_ld << "\", \"/usr/bin/ld\" },\n";
-		istr << "	};\n";
-		istr << "	return c;\n";
-		istr << "}\n";
-	}
-
-	{
-		std::ofstream istr(configHeaderFile);
-		istr << "#pragma once\n\n";
-		istr << "#define HAS_FOO 1\n";
-		istr << "//#define HAS_BAR 1\n";
-	}
-
-	return 0;
-}
diff --git a/src/ctor.h b/src/ctor.h
index 1b6c560..3b64cb5 100644
--- a/src/ctor.h
+++ b/src/ctor.h
@@ -201,7 +201,7 @@ struct build_configuration
 {
 	std::string name; // Name - used for referring in other configurations.
 	ctor::target_type type{ctor::target_type::automatic};
-	ctor::output_system system{ctor::output_system::host};
+	ctor::output_system system{ctor::output_system::build};
 	std::string target; // Output target file for this configuration
 	std::vector<ctor::source> sources; // source list
 	std::vector<std::string> depends; // internal target dependencies
@@ -225,7 +225,7 @@ struct external_manual
 struct external_configuration
 {
 	std::string name; // Name for configuration
-	ctor::output_system system{ctor::output_system::host};
+	ctor::output_system system{ctor::output_system::build};
 	std::variant<ctor::external_manual> external;
 };
 
diff --git a/src/task_ar.cc b/src/task_ar.cc
index 60f7dd1..19a65ae 100644
--- a/src/task_ar.cc
+++ b/src/task_ar.cc
@@ -22,6 +22,8 @@ TaskAR::TaskAR(const ctor::build_configuration& config,
 	, sourceDir(sourceDir)
 {
 	target_type = ctor::target_type::static_library;
+	output_system = config.system;
+
 	_targetFile = target;
 	auto toolchain = getToolChain(config.system);
 	_targetFile = extension(toolchain, target_type, config.system, _targetFile);
diff --git a/src/task_cc.cc b/src/task_cc.cc
index 5c4adfb..294c5ea 100644
--- a/src/task_cc.cc
+++ b/src/task_cc.cc
@@ -30,6 +30,7 @@ TaskCC::TaskCC(const ctor::build_configuration& config, const ctor::settings& se
 	base += sourceFile.stem();
 
 	target_type = ctor::target_type::object;
+	output_system = config.system;
 	source_language = source.language;
 	if(source_language == ctor::language::automatic)
 	{
diff --git a/src/task_ld.cc b/src/task_ld.cc
index b7e8749..b0aa4ae 100644
--- a/src/task_ld.cc
+++ b/src/task_ld.cc
@@ -22,6 +22,8 @@ TaskLD::TaskLD(const ctor::build_configuration& config,
 	, sourceDir(sourceDir)
 {
 	target_type = config.type;
+	output_system = config.system;
+
 	if(target_type == ctor::target_type::automatic)
 	{
 		target_type = ctor::target_type::executable;
diff --git a/src/task_so.cc b/src/task_so.cc
index 54f9c05..ba96388 100644
--- a/src/task_so.cc
+++ b/src/task_so.cc
@@ -24,6 +24,8 @@ TaskSO::TaskSO(const ctor::build_configuration& config,
 	std::filesystem::path base = sourceDir;
 
 	target_type = ctor::target_type::dynamic_library;
+	output_system = config.system;
+
 	_targetFile = base / target;
 	auto toolchain = getToolChain(config.system);
 	_targetFile = extension(toolchain, target_type, config.system, _targetFile);
diff --git a/test/ctor.cc b/test/ctor.cc
index ea5ae1e..ccf1c31 100644
--- a/test/ctor.cc
+++ b/test/ctor.cc
@@ -11,6 +11,7 @@ ctor::build_configurations ctorTestConfigs(const ctor::settings& settings)
 	{
 		{
 			.type = ctor::target_type::unit_test,
+			.system = ctor::output_system::build,
 			.target = "testprog",
 			.sources = {
 				"testprog.cc",
@@ -23,6 +24,7 @@ ctor::build_configurations ctorTestConfigs(const ctor::settings& settings)
 		},
 		{
 			.type = ctor::target_type::unit_test,
+			.system = ctor::output_system::build,
 			.target = "execute_test",
 			.sources = {
 				"execute_test.cc",
@@ -42,6 +44,7 @@ ctor::build_configurations ctorTestConfigs(const ctor::settings& settings)
 		},
 		{
 			.type = ctor::target_type::unit_test,
+			.system = ctor::output_system::build,
 			.target = "tasks_test",
 			.sources = {
 				"tasks_test.cc",
@@ -59,6 +62,7 @@ ctor::build_configurations ctorTestConfigs(const ctor::settings& settings)
 		},
 		{
 			.type = ctor::target_type::unit_test,
+			.system = ctor::output_system::build,
 			.target = "source_type_test",
 			.sources = {
 				"source_type_test.cc",
@@ -76,6 +80,7 @@ ctor::build_configurations ctorTestConfigs(const ctor::settings& settings)
 		},
 		{
 			.type = ctor::target_type::unit_test,
+			.system = ctor::output_system::build,
 			.target = "tools_test",
 			.sources = {
 				"tools_test.cc",
@@ -94,6 +99,7 @@ ctor::build_configurations ctorTestConfigs(const ctor::settings& settings)
 		},
 		{
 			.type = ctor::target_type::unit_test_library,
+			.system = ctor::output_system::build,
 			.target = "libctor_nomain.a",
 			.sources = {
 				"../src/build.cc",