Hard fail if hipconfig fallback doesn't return version

Author: sstamenk

CMakeLists.txt

@@ -308,14 +308,25 @@ elseif(BUILD_ROCM)
         if(NOT _DETECTED_ROCM_VERSION)
             execute_process(COMMAND hipconfig --version OUTPUT_VARIABLE HIP_CONFIG_VERSION)
             string(REGEX MATCH "[0-9]+\\.[0-9]+" _DETECTED_ROCM_VERSION "${HIP_CONFIG_VERSION}")
-            message(WARNING
-                "Could not infer ROCm version from ${_ROCM_ROOT}/.info/version; falling back to hipconfig.\n"
-                "Starting with ROCm 7.x the HIP SDK version diverges from the ROCm version, "
-                "which may produce a misnamed library.\n"
-                "To fix this you can either:\n"
-                "  - At build time: cmake -DROCM_VERSION=<shortcode> (e.g. -DROCM_VERSION=71 for ROCm 7.1)\n"
-                "  - At runtime:    export BNB_ROCM_VERSION=<shortcode> (e.g. BNB_ROCM_VERSION=71)"
-            )
+            
+            if(_DETECTED_ROCM_VERSION)
+                message(WARNING
+                    "Could not read ROCm version from ${_ROCM_ROOT}/.info/version; "
+                    "falling back to hipconfig (${_DETECTED_ROCM_VERSION}).\n"
+                    "Starting with ROCm 7.x the HIP SDK version diverges from the ROCm version, "
+                    "which may produce a misnamed library.\n"
+                    "To fix this you can either:\n"
+                    "  - At build time: cmake -DROCM_VERSION=<shortcode> (e.g. -DROCM_VERSION=71 for ROCm 7.1)\n"
+                    "  - At runtime:    export BNB_ROCM_VERSION=<shortcode> (e.g. BNB_ROCM_VERSION=71)"
+                )
+            else()
+                message(FATAL_ERROR
+                    "Could not detect the ROCm version.\n"
+                    "Checked:\n"
+                    "  1. ${_ROCM_ROOT}/.info/version — not found or not readable\n"
+                    "  2. hipconfig --version — not found or returned no version\n"
+                    "Please install ROCm and ensure ROCM_PATH is set correctly, or\n"
+                )
         endif()
 
         string(REPLACE "." "" _DETECTED_ROCM_VERSION_SHORT "${_DETECTED_ROCM_VERSION}")