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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`PCBuild` needs an analog of `make regen-cases`","articleBody":"# Feature or enhancement\r\n\r\nWindows developers need a way to invoke `Tools/cases_generator/generate_cases.py` with all necessary flags (and, probably, environment variables) skipping the challenge of manual typing.\r\n\r\nOn non-Windows platforms it's achieved with `make regen-all` that depends on the `regen-cases` target: https://github.com/python/cpython/blob/a679c3d58d10aafd9ac9355fdd16151607e37d65/Makefile.pre.in#L1490-L1503\r\n\r\nBy analogy, `PCBuild\\regen.targets` could do the same for MSBuild.\r\n\r\n# Pitch\r\n\r\nWhen I tried to resolve a `Python/generated_cases.c.h` conflict in gh-103976, I found out that I cannot do it easily. An attempt to port the `regen-cases` target was unsuccessfull:\r\n\r\n\u003cpre\u003e\r\n\u003cb\u003eD:\\Oleg\\cpython\u003eset PYTHONPATH=D:\\Oleg\\cpython\\Tools\\cases_generator\u003c/b\u003e\r\n\r\n\u003cb\u003eD:\\Oleg\\cpython\u003epython Tools/cases_generator/generate_cases.py --emit-line-directives Python/generated_cases.c.h.new Python/opcode_metadata.h.new\u003c/b\u003e\r\nRunning Release|x64 interpreter...\r\nTraceback (most recent call last):\r\n  File \"D:\\Oleg\\cpython\\Tools\\cases_generator\\generate_cases.py\", line 1259, in \u003cmodule\u003e\r\n    main()\r\n  File \"D:\\Oleg\\cpython\\Tools\\cases_generator\\generate_cases.py\", line 1250, in main\r\n    a.parse()  # Raises SyntaxError on failure\r\n    ^^^^^^^^^\r\n  File \"D:\\Oleg\\cpython\\Tools\\cases_generator\\generate_cases.py\", line 557, in parse\r\n    self.parse_file(filename, instrs_idx)\r\n  File \"D:\\Oleg\\cpython\\Tools\\cases_generator\\generate_cases.py\", line 568, in parse_file\r\n    with open(filename) as file:\r\n         ^^^^^^^^^^^^^^\r\nFileNotFoundError: [Errno 2] No such file or directory: 'Python/generated_cases.c.h.new'\r\n\r\n\u003cb\u003eD:\\Oleg\\cpython\u003epython Tools/cases_generator/generate_cases.py --emit-line-directives Python/generated_cases.c.h Python/opcode_metadata.h\u003c/b\u003e\r\nRunning Release|x64 interpreter...\r\nTraceback (most recent call last):\r\n  File \"D:\\Oleg\\cpython\\Tools\\cases_generator\\generate_cases.py\", line 1259, in \u003cmodule\u003e\r\n    main()\r\n  File \"D:\\Oleg\\cpython\\Tools\\cases_generator\\generate_cases.py\", line 1250, in main\r\n    a.parse()  # Raises SyntaxError on failure\r\n    ^^^^^^^^^\r\n  File \"D:\\Oleg\\cpython\\Tools\\cases_generator\\generate_cases.py\", line 557, in parse\r\n    self.parse_file(filename, instrs_idx)\r\n  File \"D:\\Oleg\\cpython\\Tools\\cases_generator\\generate_cases.py\", line 583, in parse_file\r\n    raise psr.make_syntax_error(\r\n  File \"Python/generated_cases.c.h\", line 4658\r\n    }\r\n    ^\r\nSyntaxError: Couldn't find '// BEGIN BYTECODES //' in Python/generated_cases.c.h\r\n\u003c/pre\u003e\r\n\r\nAutogenegeration would lift off a need to write a private batch-file, debug it, and use it each time `Python/bytecodes.c` is touched.\r\n\r\n# Your environment\r\n\r\n\u003c!-- Include as many relevant details as possible about the environment you experienced the bug in --\u003e\r\n\r\n- CPython versions tested on: `Python 3.12.0a7+ (heads/main:5078eedc5b, May  1 2023, 23:20:56) [MSC v.1929 64 bit (AMD64)] on win32`","author":{"url":"https://github.com/arhadthedev","@type":"Person","name":"arhadthedev"},"datePublished":"2023-05-01T19:27:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/104055/cpython/issues/104055"}