[cfe-dev] Feature testing optimize push/off

[Reid Kleckner]

I don't think we have feature-detection for pragmas because we generally
prefer attributes. However, you can use __attribute__((optnone)), and test
for it with `#if __has_attribute(optnone)`.

On Sat, Dec 20, 2014 at 3:14 AM, Michael Savage <mikejsavage at gmail.com>
wrote:

> Hi,
>
> I am writing a library[1] which relies on being able to disable
> optimisations for blocks of code. I'm struggling with how to detect when
> `optimize push "-O0"` and `optimize off` are available.
>
> [1]: https://github.com/mikejsavage/safebfuns
>
> At the moment I use version numbers, but it doesn't seem to be
> reliable as I couldn't find anywhere documenting when it got
> added/deprecated, and OSX users apparently get Clang v600.
>
> How can I do this properly?
>
> Thanks,
> Mike
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