Use REG function for configuration, like with build_configurations, to get rid of the hacky weak symbol method.no_more_weak

2 files changed, 29 insertions, 2 deletions

diff --git a/src/configure.cc b/src/configure.cc
index 1b8caa6..5ba87c3 100644
--- a/src/configure.cc
+++ b/src/configure.cc
@@ -10,6 +10,7 @@
 #include <optional>
 #include <span>
 #include <cstring>
+#include <functional>
 
 #include "execute.h"
 #include "ctor.h"
@@ -26,8 +27,30 @@ const std::filesystem::path configHeaderFile("config.h");
 std::map<std::string, std::string> external_includedir;
 std::map<std::string, std::string> external_libdir;
 
-const ctor::configuration& __attribute__((weak)) ctor::get_configuration()
+std::function<const ctor::configuration&()>& getConfigurationCallback()
 {
+	static std::function<const ctor::configuration&()> configuration_callback;
+	return configuration_callback;
+}
+
+namespace ctor {
+int reg(std::function<const ctor::configuration&()> cb,
+        [[maybe_unused]]const std::source_location location)
+{
+	auto& configuration_callback = getConfigurationCallback();
+	configuration_callback = cb;
+	return {};
+}
+} // ctor::
+
+const ctor::configuration& ctor::get_configuration()
+{
+	auto& configuration_callback = getConfigurationCallback();
+	if(configuration_callback)
+	{
+		return configuration_callback();
+	}
+
 	static ctor::configuration cfg;
 	static bool initialised{false};
 	if(!initialised)
@@ -752,7 +775,7 @@ int regenerateCache(ctor::settings& settings,
 	std::cout << "Generating configuration: " << configurationFile.string() << "\n"; {
 		std::stringstream istr;
 		istr << "#include <ctor.h>\n\n";
-		istr << "const ctor::configuration& ctor::get_configuration()\n";
+		istr << "const ctor::configuration& stored_configuration()\n";
 		istr << "{\n";
 		istr << "	static ctor::configuration cfg =\n";
 		istr << "	{\n";
@@ -902,6 +925,7 @@ int regenerateCache(ctor::settings& settings,
 		istr << "	};\n";
 		istr << "	return cfg;\n";
 		istr << "}\n";
+		istr << "\nREG(stored_configuration);\n";
 
 		auto new_configuration = istr.str();
 		auto current_configuration = readFile(configurationFile.string());
diff --git a/src/ctor.h b/src/ctor.h
index 890c257..8a7c809 100644
--- a/src/ctor.h
+++ b/src/ctor.h
@@ -579,4 +579,7 @@ struct configuration
 
 const ctor::configuration& get_configuration();
 
+int reg(std::function<const ctor::configuration&()> cb,
+        const std::source_location location = std::source_location::current());
+
 } // ctor::