From e9023132d506a9223d6c7c315a3cdf118effd30e Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Mon, 23 May 2022 18:46:13 +0200
Subject: Added support for manual externals (inherit flags and set include/lib
 paths from configure).

---
 src/configure.cc | 97 ++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 77 insertions(+), 20 deletions(-)

(limited to 'src/configure.cc')

diff --git a/src/configure.cc b/src/configure.cc
index 4df6026..02e8224 100644
--- a/src/configure.cc
+++ b/src/configure.cc
@@ -15,10 +15,14 @@
 #include "libctor.h"
 #include "tasks.h"
 #include "rebuild.h"
+#include "externals.h"
 
 std::filesystem::path configurationFile("configuration.cc");
 std::filesystem::path configHeaderFile("config.h");
 
+std::map<std::string, std::string> external_includedir;
+std::map<std::string, std::string> external_libdir;
+
 const Configuration default_configuration{};
 const Configuration& __attribute__((weak)) configuration()
 {
@@ -143,6 +147,9 @@ public:
 	}
 };
 
+// helper constant for the visitor
+template<class> inline constexpr bool always_false_v = false;
+
 int regenerateCache(const Settings& default_settings,
                     const std::vector<std::string>& args,
                     const std::map<std::string, std::string>& env)
@@ -249,6 +256,51 @@ int regenerateCache(const Settings& default_settings,
 		        return 0;
 	        });
 
+	// Resolv externals
+	ExternalConfigurations externalConfigs;
+	for(std::size_t i = 0; i < numExternalConfigFiles; ++i)
+	{
+		auto newExternalConfigs = externalConfigFiles[i].cb();
+		externalConfigs.insert(externalConfigs.end(),
+		                       newExternalConfigs.begin(),
+		                       newExternalConfigs.end());
+	}
+
+	auto add_path_args =
+		[&](const std::string& name)
+		{
+			opt.add(name + "-includedir", required_argument, key++,
+			        "Set path to " + name + " header file.",
+			        [&]() {
+				        external_includedir[name] = optarg;
+				        return 0;
+			        });
+
+			opt.add(name + "-libdir", required_argument, key++,
+			        "Set path to " + name + " libraries.",
+			        [&]() {
+				        external_libdir[name] = optarg;
+				        return 0;
+			        });
+		};
+
+	for(const auto& ext : externalConfigs)
+	{
+		std::visit([&](auto&& arg)
+		           {
+			           using T = std::decay_t<decltype(arg)>;
+			           if constexpr (std::is_same_v<T, ExternalManual>)
+			           {
+				           add_path_args(ext.name);
+			           }
+			           else
+			           {
+				           static_assert(always_false_v<T>, "non-exhaustive visitor!");
+			           }
+		           }, ext.external);
+
+	}
+
 	opt.add("help", no_argument, 'h',
 	        "Print this help text.",
 	        [&]() {
@@ -325,16 +377,6 @@ int regenerateCache(const Settings& default_settings,
 	std::string build_ar = locate(build_arch, ar_prog);
 	std::string build_ld = locate(build_arch, ld_prog);
 
-	// Resolv externals
-	ExternalConfigurations externalConfigs;
-	for(std::size_t i = 0; i < numExternalConfigFiles; ++i)
-	{
-		auto newExternalConfigs = externalConfigFiles[i].cb();
-		externalConfigs.insert(externalConfigs.end(),
-		                       newExternalConfigs.begin(),
-		                       newExternalConfigs.end());
-	}
-
 	std::cout << "Writing results to: " << configurationFile.string() << "\n";
 	{
 		std::ofstream istr(configurationFile);
@@ -380,44 +422,59 @@ int regenerateCache(const Settings& default_settings,
 		istr << "		},\n";
 		istr << "		.externals = {\n";
 
-		for(const auto& externalConfig : externalConfigs)
+		for(const auto& ext : externalConfigs)
 		{
-			istr << "			{ \"" << externalConfig.name << "\", {\n";
+			istr << "			{ \"" << ext.name << "\", {\n";
+			Flags resolved_flags;
+			if(std::holds_alternative<ExternalManual>(ext.external))
+			{
+				if(auto ret = resolv(settings, ext.name,
+				                     std::get<ExternalManual>(ext.external),
+				                     resolved_flags))
+				{
+					return ret;
+				}
+			}
+			else
+			{
+				std::cout << "Unknown external type\n";
+				return 1;
+			}
 
-			if(!externalConfig.flags.cxxflags.empty())
+			if(!resolved_flags.cxxflags.empty())
 			{
 				istr << "			  .cxxflags = {";
-				for(const auto& flag : externalConfig.flags.cxxflags)
+				for(const auto& flag : resolved_flags.cxxflags)
 				{
 					istr << "\"" << flag << "\",";
 				}
 				istr << "},\n";
 			}
 
-			if(!externalConfig.flags.cflags.empty())
+			if(!resolved_flags.cflags.empty())
 			{
 				istr << "			  .cflags = {";
-				for(const auto& flag : externalConfig.flags.cflags)
+				for(const auto& flag : resolved_flags.cflags)
 				{
 					istr << "\"" << flag << "\",";
 				}
 				istr << "},\n";
 			}
 
-			if(!externalConfig.flags.ldflags.empty())
+			if(!resolved_flags.ldflags.empty())
 			{
 				istr << "			  .ldflags = {";
-				for(const auto& flag : externalConfig.flags.ldflags)
+				for(const auto& flag : resolved_flags.ldflags)
 				{
 					istr << "\"" << flag << "\",";
 				}
 				istr << "},\n";
 			}
 
-			if(!externalConfig.flags.asmflags.empty())
+			if(!resolved_flags.asmflags.empty())
 			{
 				istr << "			  .asmflags = {";
-				for(const auto& flag : externalConfig.flags.asmflags)
+				for(const auto& flag : resolved_flags.asmflags)
 				{
 					istr << "\"" << flag << "\",";
 				}
-- 
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