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Errm, the email at https://lists.kernelnewbies.org/pipermail/kernelnewbies/2016... seems to be warning him against using an unusual set of custom compiler optimisation options that none of the kernel developers have ever tested with rather than against using a debugger full stop.

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The beginner wants to disable optimizations, so he can better understand the kernel behavior by stepping through it in a debugger; he's told this isn't possible. Compare this with the availability of checked builds of Windows components, which support debugging by disabling optimizations: https://docs.microsoft.com/en-us/windows-hardware/drivers/de...

Checked builds are no longer distributed.

Source: https://social.msdn.microsoft.com/Forums/windowsdesktop/en-U...

I think checked builds did not disable optimizations, though it did include useful stuff.

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