Make C++20 the default

CMakeLists.txt

@@ -31,7 +31,7 @@ cmake_policy(SET CMP0116 OLD)
 # =============================================================================
 # User Options
 # =============================================================================
-option(CPP_20_SUPPORT "C++20 Support" OFF)
+option(CPP_20_SUPPORT "C++20 Support" ON)
 option(SERENE_BUILD_TESTING "Enable tests" OFF)
 option(SERENE_ENABLE_BUILDID "Enable build id." OFF)
 option(SERENE_ENABLE_THINLTO "Enable ThisLTO." ON)

serene/include/serene/config.h.in

@@ -1,6 +1,11 @@
 #ifndef CONFIG_H
 #define CONFIG_H
 
+#if __cplusplus < 202002L
+#  error "C++20 or better is required"
+#endif
+
+
 // the configured options and settings
 
 #define SERENE_VERSION "@PROJECT_VERSION@"

serene/src/options.h

@@ -43,6 +43,8 @@ enum class CompilationPhase {
 /// different subsystem that might use it.
 struct Options {
 
+  bool verbose = false;
+
   /// Whether to use colors for the output or not
   bool withColors = true;