Feature or enhancement

Windows developers need a way to invokeTools/cases_generator/generate_cases.py with all necessary flags (and, probably, environment variables) skipping the challenge of manual typing.

On non-Windows platforms it's achieved withmake regen-all that depends on theregen-cases target:

By analogy,PCBuild\regen.targets could do the same for MSBuild.

Pitch

When I tried to resolve aPython/generated_cases.c.h conflict ingh-103976, I found out that I cannot do it easily. An attempt to port theregen-cases target was unsuccessfull:

D:\Oleg\cpython>set PYTHONPATH=D:\Oleg\cpython\Tools\cases_generatorD:\Oleg\cpython>python Tools/cases_generator/generate_cases.py --emit-line-directives Python/generated_cases.c.h.new Python/opcode_metadata.h.newRunning Release|x64 interpreter...Traceback (most recent call last):  File "D:\Oleg\cpython\Tools\cases_generator\generate_cases.py", line 1259, in     main()  File "D:\Oleg\cpython\Tools\cases_generator\generate_cases.py", line 1250, in main    a.parse()  # Raises SyntaxError on failure    ^^^^^^^^^  File "D:\Oleg\cpython\Tools\cases_generator\generate_cases.py", line 557, in parse    self.parse_file(filename, instrs_idx)  File "D:\Oleg\cpython\Tools\cases_generator\generate_cases.py", line 568, in parse_file    with open(filename) as file:         ^^^^^^^^^^^^^^FileNotFoundError: [Errno 2] No such file or directory: 'Python/generated_cases.c.h.new'D:\Oleg\cpython>python Tools/cases_generator/generate_cases.py --emit-line-directives Python/generated_cases.c.h Python/opcode_metadata.hRunning Release|x64 interpreter...Traceback (most recent call last):  File "D:\Oleg\cpython\Tools\cases_generator\generate_cases.py", line 1259, in     main()  File "D:\Oleg\cpython\Tools\cases_generator\generate_cases.py", line 1250, in main    a.parse()  # Raises SyntaxError on failure    ^^^^^^^^^  File "D:\Oleg\cpython\Tools\cases_generator\generate_cases.py", line 557, in parse    self.parse_file(filename, instrs_idx)  File "D:\Oleg\cpython\Tools\cases_generator\generate_cases.py", line 583, in parse_file    raise psr.make_syntax_error(  File "Python/generated_cases.c.h", line 4658    }    ^SyntaxError: Couldn't find '// BEGIN BYTECODES //' in Python/generated_cases.c.h

Autogenegeration would lift off a need to write a private batch-file, debug it, and use it each timePython/bytecodes.c is touched.

Your environment

• 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