Implement GetVersion.

Author: vgvassilev

include/clang/Interpreter/CppInterOp.h

@@ -117,6 +117,9 @@ namespace Cpp {
     }
   };
 
+  ///\returns the version string information of the library.
+  std::string GetVersion();
+
   /// Enables or disables the debugging printouts on stderr.
   /// Debugging output can be enabled also by the environment variable
   /// CPPINTEROP_EXTRA_INTERPRETER_ARGS. For example,

lib/Interpreter/CppInterOp.cpp

@@ -115,6 +115,19 @@ namespace Cpp {
 
 #undef DEBUG_TYPE
 
+  std::string GetVersion() {
+    const char* const VERSION = "1.0~dev";
+    std::string fullVersion = "CppInterOp version";
+    fullVersion += VERSION;
+    fullVersion += "\n (based on "
+#ifdef USE_CLING
+                   "cling ";
+#else
+                   "clang-repl";
+#endif // USE_CLING
+    return fullVersion + "[" + clang::getClangFullVersion() + "])\n";
+  }
+
   void EnableDebugOutput(bool value/* =true*/) {
     llvm::DebugFlag = value;
   }

unittests/CMakeLists.txt

@@ -7,6 +7,12 @@ if (NOT TARGET gtest)
   include(GoogleTest)
 endif()
 
+set(gtest_libs gtest gtest_main)
+# Clang prior than clang13 (I think) merges both gmock into gtest.
+if (TARGET gmock)
+  list(APPEND gtest_libs gmock gmock_main)
+endif()
+
 add_custom_target(CppInterOpUnitTests)
 set_target_properties(CppInterOpUnitTests PROPERTIES FOLDER "CppInterOp tests")
 add_dependencies(CppInterOpUnitTests clangCppInterOp)
@@ -18,7 +24,7 @@ function(add_cppinterop_unittest name)
   target_include_directories(${name} PUBLIC ${CMAKE_CURRENT_BINARY_DIR} ${GTEST_INCLUDE_DIR})
   set_property(TARGET ${name} PROPERTY RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
 
-  target_link_libraries(${name} PUBLIC ${ARG_LIBRARIES} gtest gtest_main pthread)
+  target_link_libraries(${name} PUBLIC ${ARG_LIBRARIES} ${gtest_libs} pthread)
 
   add_test(NAME cppinterop-${name} COMMAND ${name})
   set_tests_properties(cppinterop-${name} PROPERTIES

unittests/CppInterOp/InterpreterTest.cpp

@@ -1,7 +1,14 @@
 #include "clang/Interpreter/CppInterOp.h"
 
+#include <gmock/gmock.h>
 #include "gtest/gtest.h"
 
+using ::testing::StartsWith;
+
+TEST(InterpreterTest, Version) {
+  EXPECT_THAT(Cpp::GetVersion(), StartsWith("CppInterOp version"));
+}
+
 TEST(InterpreterTest, DebugFlag) {
   EXPECT_FALSE(Cpp::IsDebugOutputEnabled());
   std::string cerrs;