Why would #ifdef Q_OS_DARWIN not work on a Mac?

Stokestack

Hi all.

If I enclose code with this on a Mac, it's marked as disabled and indeed is not compiled.

Anyone know why?

Thanks!

SGaist

Hi,

It's all in the doc of Q_OS_DARWIN.

For more information about why Darwin, see here.

Stokestack

Thanks for your reply. I had read that doc, but it simply says the symbol IS defined.

The preprocessor, despite being on a Mac, says it ISN'T defined. It also says Q_OS_MACOS isn't defined.

UPDATE: I discovered what triggers the failure: If #ifdef is the first significant line in the file, it doesn't work. If you have something else above it (like a #include), it works. I've never encountered this before. Is it normal?

SGaist

Yes it's normal, Q_OS_DARWIN is not defined by the compiler, you can find it the QtGlobals header. As long as you don't include anything Qt, you won't have access to any of these platform defines.

Stokestack

Good to know. Thanks.

SGaist

You're welcome !

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