try to fix by changing cmake proper

Signed-off-by: raayandhar <[email protected]>

Author: raayandhar

build_tools/cmake/TorchMLIRPyTorch.cmake

@@ -67,50 +67,16 @@ function(TorchMLIRConfigurePyTorch)
     endif()
     message(STATUS "PyTorch C++ Dual ABI setting: \"${_use_cxx11_abi}\"")
 
-    # Check ABI compatibility version
-    # Note: _PYBIND11_BUILD_ABI was removed in PyTorch 2.5+
-    # First, try the new method (checking libtorch_python.so)
+    # Try this...
     execute_process(
-      COMMAND ${Python3_EXECUTABLE}
-      -c "import torch; import sys; abi = getattr(torch._C, '_PYBIND11_BUILD_ABI', None); sys.stdout.write(str(abi) if abi else '')"
+      COMMAND bash "-c" "${Python3_EXECUTABLE} -c 'import torch; import os; print(os.path.join(os.path.dirname(torch.__file__), \"lib\", \"libtorch_python.so\"))' | xargs strings | grep -E '^_cxxabi[0-9]{4}' | head -1 | grep -oE '..$'"
       RESULT_VARIABLE _result
-      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-      OUTPUT_VARIABLE _pybind11_abi)
-
-    if(_result EQUAL "0" AND _pybind11_abi AND _pybind11_abi MATCHES "^_cxxabi10")
-      # Old method worked - extract ABI version from the string
-      string(REGEX REPLACE "^_cxxabi10(..)$" "\\1" _cxx_abi_version "${_pybind11_abi}")
-      message(STATUS "PyTorch C++ ABI version (from _PYBIND11_BUILD_ABI): \"${_cxx_abi_version}\"")
-    else()
-      # Fallback: try to extract from libtorch_python.so
-      message(STATUS "PyTorch _PYBIND11_BUILD_ABI not available, checking libtorch_python.so...")
-      execute_process(
-        COMMAND ${Python3_EXECUTABLE}
-        -c "import torch; import os; print(os.path.join(os.path.dirname(torch.__file__), 'lib', 'libtorch_python.so'), end='')"
-        RESULT_VARIABLE _result
-        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-        OUTPUT_VARIABLE _libtorch_python_path)
-
-      if(_result EQUAL "0" AND EXISTS "${_libtorch_python_path}")
-        execute_process(
-          COMMAND bash "-c" "strings ${_libtorch_python_path} | grep -E '^_cxxabi[0-9]{4}' | head -1 | grep -oE '..$'"
-          RESULT_VARIABLE _result
-          OUTPUT_VARIABLE _cxx_abi_version
-          OUTPUT_STRIP_TRAILING_WHITESPACE)
-
-        if(_result EQUAL "0" AND _cxx_abi_version)
-          message(STATUS "PyTorch C++ ABI version (from libtorch_python.so): \"${_cxx_abi_version}\"")
-        else()
-          # Final fallback: use a sensible default (ABI version 11 is most common)
-          set(_cxx_abi_version "11")
-          message(WARNING "Could not determine PyTorch C++ ABI version, using default: \"${_cxx_abi_version}\"")
-        endif()
-      else()
-        # Final fallback: use a sensible default
-        set(_cxx_abi_version "11")
-        message(WARNING "Could not find libtorch_python.so, using default ABI version: \"${_cxx_abi_version}\"")
-      endif()
+      OUTPUT_VARIABLE _cxx_abi_version
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
+    if(_result)
+      message(FATAL_ERROR "Failed to determine C++ ABI version")
     endif()
+    message(STATUS "PyTorch C++ ABI version: \"${_cxx_abi_version}\"")
 
     # Specialize compile flags for compiler
     if(${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")