[ET-VK] Fix caching mechanism to account for included files #12449
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## Changes * Update the `gen_vulkan_spv.py` script to account for changes to included files when decided whether to perform a re-compilation ## Additional Changes Also applied some misc fixes: * Allow the Python preprocessor to handle unescaped `\` used to extend macros to multiple lines. Fixed this by replacing these with `\` before running the preprocessor. * Fixed an issue where build would unexpectedly pass when trying to recompile a failing build multiple time. This would cause the caching mechanism to use a old cached build artifact since no changes were detected. Fixed this by removing any existing cached artifacts on unsuccessful build. ## Context The `gen_vulkan_spv.py` script which handles GLSL shader codegen and GLSL -> SPIR-V compilation for the ExecuTorch Vulkan backend has a caching mechanism to only recompile modified files for the purpose of developer efficiency. However, this mechanism currently doesn't consider whether included files have been changed. Therefore, if a include file is modified without first modifying the source file which uses it, the changes to the include file will not be captured. Differential Revision: [D78275585](https://our.internmc.facebook.com/intern/diff/D78275585/) ghstack-source-id: 296055474 Pull Request resolved: #12441
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12449
Note: Links to docs will display an error until the docs builds have been completed. ❌ 1 New Failure, 18 PendingAs of commit f28c5a1 with merge base 1540659 ( NEW FAILURE - The following job has failed:
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #12441 by @SS-JIA
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/SS-JIA/256/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/256/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/256/orig
@diff-train-skip-merge