![ciflow/torchtitan/179229: [inductor] makes cuda 13.0 cross compliation works (#179229)](https://avatars.githubusercontent.com/u/22138577?s=60&v=4)
ciflow/torchtitan/179229: [inductor] makes cuda 13.0 cross compliation works (#179229)
Summary: CUDA 13.0+ ships a hybrid cudart.lib that contains MSVC-compiled static objects referencing GS security symbols (__security_cookie, __security_check_cookie, etc.) which MinGW cannot resolve, causing undefined reference errors during Windows cross-compilation. This diff adds a _ensure_mingw_cudart_import_lib() function to cpp_builder.py that automatically generates a pure MinGW-compatible import library (libcudart.a) from the CUDA runtime DLL using gendef + x86_64-w64-mingw32-dlltool. If WINDOWS_CUDA_HOME is not set or libcudart.a already exists, no action is taken. Locates cudart64_*.dll in the CUDA bin directory, generates a .def file via gendef, and creates libcudart.a via dlltool. Falls back gracefully to the original cudart.lib if gendef/dlltool are unavailable or fail to supp
Summary:
CUDA 13.0+ ships a hybrid cudart.lib that contains MSVC-compiled static objects referencing GS security symbols (__security_cookie, __security_check_cookie, etc.) which MinGW cannot resolve, causing undefined reference errors during Windows cross-compilation.
This diff adds a ensure_mingw_cudart_import_lib() function to cpp_builder.py that automatically generates a pure MinGW-compatible import library (libcudart.a) from the CUDA runtime DLL using gendef + x86_64-w64-mingw32-dlltool.
If WINDOWS_CUDA_HOME is not set or libcudart.a already exists, no action is taken. Locates cudart64_.dll in the CUDA bin directory, generates a .def file via gendef, and creates libcudart.a via dlltool. Falls back gracefully to the original cudart.lib if gendef/dlltool are unavailable or fail to support lower version like 12.6._
Test Plan: ci
Differential Revision: D99398736`
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