Various fixes for autodiff and slangpy. (#2876)

* Various fixes for autodiff and slangpy.

* Fix cuda code gen for `select`.

* Fix getBuildTagString().

* Fix.

---------

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/source/slang/slang.cpp b/source/slang/slang.cpp
index a1c8f9b03..f2598786f 100644
--- a/source/slang/slang.cpp
+++ b/source/slang/slang.cpp
@@ -125,6 +125,14 @@ namespace Slang {
 
 const char* getBuildTagString()
 {
+    if (UnownedStringSlice(SLANG_TAG_VERSION) == "unknown")
+    {
+        // If the tag is unknown, then we will try to get the timestamp of the shared library
+        // and use that as the version string, so that we can at least return something
+        // that uniquely identifies the build.
+        static String timeStampString = String(SharedLibraryUtils::getSharedLibraryTimestamp((void*)spCreateSession));
+        return timeStampString.getBuffer();
+    }
     return SLANG_TAG_VERSION;
 }