Re: What is the value of TARGET_C99_FUNCTIONS on Darwin?

[Eric Christopher <echristo at apple dot com>]

> Thanks for the answer, but I understand very little of it.
>
> > The above can be read as:
> >
> > If TARGET_64BIT is true, then TARGET_C99_FUNCTIONS is true,
> > otherwise if we're targeting 10.3 or later, then TARGET_C99_FUNCTIONS
> > is true, otherwise, TARGET_C99_FUNCTIONS is false.
>
> So far so good.
>
> we are targeting means that flag:
>
> > -mmacosx-version-min=version
> >     The earliest version of MacOS X that this executable will
> >     run on is version.
> >     Typical values of version include 10.1, 10.2, and 10.3.9.
> >
> >     The default for this option is to make choices that seem
> >     to be most useful.
>
> Is this under the user control and how?

Yup. You can set it on the command line. A lot of people I've noticed  
set it to
10.3.9 for the latest panther update. 10.4 would mean tiger and  
above, and
10.5 will be leopard and above.

> > though, the exact default for this flag is changing (has change, is
> > going to change).
>
> I noticed that!

The idea, I believe, is that the default will be the system that you  
are currently
on.

> > For example, if you tell it,
>
> How could I? I would be interested by 10.3.9 (possibly 10.4.9).

gcc -mmacosx-version-min=10.3.9 ...


> This is a part I cannot decipher.

Don't worry about that :) Basically it's depending things based on other
command line options by default. If, however, you always set it then you
should be fine there. I wouldn't set it for developing gcc, just using
gcc to develop some other application.

-eric