Using Cython CFLAGS to enable some feature

[Muhammad Hawash]

Hi, 

I'm on Windows 11 and using Cython through the command line to compile a module where I wanna enable  CYTHON_TRACE  trough the CFLAGS env var, but it doesn't work for me as I tried many times through both commands Cython and Cythonization by setting it as a compile time env and through setting it under the current session env in terminal, I guess it might be overridden somehow. The only way it worked for me through the Extension object using a setup.py file, but can't go with that path for some reasons, so I'm looking for a way to enable  CYTHON_TRACE by passing it somehow through  CLI/Shell. Thanks.

[da-woods]

In the past I've found that "set" (https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/set_1) works on cmd. And `$env:CFLAGS =` works on powershell. However it sounds like you're already tried those.

On 29/10/2025 22:55, Muhammad Hawash wrote:

Hi, 

I'm on Windows 11 and using Cython through the command line to compile a module where I wanna enable  CYTHON_TRACE  trough the CFLAGS env var, but it doesn't work for me as I tried many times through both commands Cython and Cythonization by setting it as a compile time env and through setting it under the current session env in terminal, I guess it might be overridden somehow. The only way it worked for me through the Extension object using a setup.py file, but can't go with that path for some reasons, so I'm looking for a way to enable  CYTHON_TRACE by passing it somehow through  CLI/Shell. Thanks.

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