Explicitly add xrt libs to LD_LIBRARY_PATH for lit (#2802)

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Co-authored-by: Copilot <[email protected]>

Author: 3 people

python/aie_lit_utils/lit_config_helpers.py

@@ -218,6 +218,14 @@ def detect_xrt(
         config.found = True
         config.flags = f"-I{xrt_include_dir} -L{xrt_lib_dir} -luuid -lxrt_coreutil"
         config.substitutions["%xrt_flags"] = config.flags
+        # Add XRT library directory to LD_LIBRARY_PATH for runtime linking,
+        # preserving any existing entries from the parent environment.
+        existing_ld_library_path = os.environ.get("LD_LIBRARY_PATH")
+        if existing_ld_library_path:
+            new_ld_library_path = existing_ld_library_path + os.pathsep + xrt_lib_dir
+        else:
+            new_ld_library_path = xrt_lib_dir
+        config.environment["LD_LIBRARY_PATH"] = new_ld_library_path
 
         # Detect NPU hardware
         try: