Implement value printing for std::source_location

include/cling/Interpreter/RuntimePrintValue.h

@@ -17,6 +17,12 @@
 #include <cling/Interpreter/Visibility.h>
 
 #include <memory>
+#if __cplusplus >= 202002L
+#include <version>
+#endif
+#ifdef __cpp_lib_source_location
+#include <source_location>
+#endif
 #include <string>
 #include <tuple>
 #include <type_traits>
@@ -141,6 +147,11 @@ namespace cling {
     return toUTF8(reinterpret_cast<const char * const>(val), N, 1);
   }
 
+#ifdef __cpp_lib_source_location
+  CLING_LIB_EXPORT
+  std::string printValue(const std::source_location* location);
+#endif
+
   // cling::Value
   CLING_LIB_EXPORT
   std::string printValue(const Value *value);

lib/Interpreter/ValuePrinter.cpp

@@ -40,6 +40,12 @@
 #include "llvm/Support/Format.h"
 
 #include <locale>
+#if __cplusplus >= 202002L
+#include <version>
+#endif
+#ifdef __cpp_lib_source_location
+#include <source_location>
+#endif
 #include <string>
 
 // GCC 4.x doesn't have the proper UTF-8 conversion routines. So use the
@@ -575,6 +581,17 @@ namespace cling {
   std::string printValue(const wchar_t *Val) {
     return toUnicode(Val, 'L', 'x');
   }
+
+#ifdef __cpp_lib_source_location
+  CLING_LIB_EXPORT
+  std::string printValue(const std::source_location* location) {
+    cling::ostrstream strm;
+    strm << location->file_name() << ":" << location->line() << ":"
+         << location->function_name();
+    return strm.str().str();
+  }
+#endif
+
 } // end namespace cling
 
 namespace {