Worked on the pytorch/pytorch repository to enhance build stability and cross-compilation readiness for Emscripten web targets. Addressed a critical build issue by implementing the missing __assert_fail declaration in Macros.h, ensuring that web builds do not fail due to undefined symbols. Used C++ and focused on compiler compatibility and cross-platform development, integrating the fix directly with the Emscripten toolchain. This change aligned macro definitions with Emscripten’s requirements, reducing compile-time errors and supporting seamless web deployment. The work improved code quality and lowered maintenance overhead for web-targeted builds, contributing to more reliable and consistent PyTorch releases across environments.