Add logging of ORT version and build info. (#1405)

It is useful to be able to see the onnxruntime version and build info
when switching between multiple onnxruntime shared libraries.

Author: edgchen1

src/logging.cpp

@@ -10,7 +10,12 @@
 namespace Generators {
 
 LogItems g_log;
-static std::ostream* gp_stream{&std::cerr};
+
+static std::ostream*& GlobalLogStreamPtr() {
+  static std::ostream* stream = &std::cerr;
+  return stream;
+}
+
 static std::unique_ptr<std::ofstream> gp_logfile;
 static CallbackFn gp_callback{};
 
@@ -33,11 +38,11 @@ struct CallbackStream : std::ostream {
 
 void SetLogStream() {
   if (gp_callback)
-    gp_stream = &gp_callback_stream;
+    GlobalLogStreamPtr() = &gp_callback_stream;
   else if (gp_logfile)
-    gp_stream = gp_logfile.get();
+    GlobalLogStreamPtr() = gp_logfile.get();
   else
-    gp_stream = &std::cerr;
+    GlobalLogStreamPtr() = &std::cerr;
 }
 
 void SetLogBool(std::string_view name, bool value) {
@@ -122,10 +127,10 @@ std::ostream& Log(std::string_view label, std::string_view string) {
   assert(g_log.enabled);
 
   // Warnings will be yellow, all other labels will be blue
-  *gp_stream << SGR::Bold << (label == "warning" ? SGR::Bg_Yellow : SGR::Bg_Blue) << "  " << label << "  " << SGR::Reset << ' ';
+  *GlobalLogStreamPtr() << SGR::Bold << (label == "warning" ? SGR::Bg_Yellow : SGR::Bg_Blue) << "  " << label << "  " << SGR::Reset << ' ';
   if (!string.empty())
-    *gp_stream << string << std::endl;
-  return *gp_stream;
+    *GlobalLogStreamPtr() << string << std::endl;
+  return *GlobalLogStreamPtr();
 }
 
 std::ostream& Log(std::string_view label, const char* fmt, ...) {

src/models/onnxruntime_api.h

@@ -206,6 +206,8 @@ inline void InitApi() {
     Generators::SetLogBool("ort_lib", true);
   }
 
+  OrtApiBaseFn ort_api_base_fn{};
+
 #if defined(__linux__) || defined(MACOS_USE_DLOPEN)
   // If the GenAI library links against the onnxruntime library, it will have a dependency on a specific
   // version of OrtGetApiBase.
@@ -257,18 +259,21 @@ inline void InitApi() {
     throw std::runtime_error(std::string("Failed to load onnxruntime. Set ORTGENAI_LOG_ORT_LIB envvar to enable detailed logging."));
   }
 
-  OrtApiBaseFn ort_api_base_fn = (OrtApiBaseFn)dlsym(ort_lib_handle, "OrtGetApiBase");
+  ort_api_base_fn = (OrtApiBaseFn)dlsym(ort_lib_handle, "OrtGetApiBase");
   if (ort_api_base_fn == nullptr) {
     char* err = dlerror();
     throw std::runtime_error(std::string("Failed to load symbol OrtGetApiBase: ") + (err != nullptr ? err : "Unknown"));
   }
 
   InitApiWithDynamicFn(ort_api_base_fn);
 #else   // defined(__linux__) || defined(MACOS_USE_DLOPEN)
-  api = OrtGetApiBase()->GetApi(ORT_API_VERSION);
+  ort_api_base_fn = &OrtGetApiBase;
+  api = ort_api_base_fn()->GetApi(ORT_API_VERSION);
   if (!api)
     throw std::runtime_error("Onnxruntime is installed but is too old, please install a newer version");
 #endif  // defined(__linux__) || defined(MACOS_USE_DLOPEN)
+
+  LOG_INFO("ORT Version: %s. %s", ort_api_base_fn()->GetVersionString(), api->GetBuildInfoString());
 }
 
 /** \brief All C++ methods that can fail will throw an exception of this type