Re: Which SDK?
Re: Which SDK?
- Subject: Re: Which SDK?
- From: Darkshadow <email@hidden>
- Date: Thu, 22 Jun 2006 14:10:58 -0400
On Jun 21, 2006, at 5:25 PM, Chris Hanson wrote:
On Jun 21, 2006, at 12:04 PM, Syd Polk wrote:
On Jun 21, 2006, at 12:59 , Mark Wagner wrote:
The current options for SDKs are 10.2.8, 10.3.9, and 10.4
(Universal).
If I wanted to compile a program that runs on 10.3.0 and later,
would
I choose the 10.3.9 SDK, or the 10.2.8 SDK?
It really depends on what you are trying to do. 10.3.0 < 10.3.9,
so you would need to use the 10.2.8 SDK to run on 10.3.0 or later.
Actually, you should be able to target 10.3.0 and later using any
of the SDKs. There are three build settings that are relevant to
which operating system versions your application is targeting:
1. GCC_VERSION defines the compiler to use.
2. SDKROOT defines the version of the headers to include and
libraries to link against; in other words, it is the *maximum* Mac
OS X version whose features your software will take advantage of.
3. MACOSX_DEPLOYMENT_TARGET defines the *minimum* Mac OS X version
you want your software to run on; in other words, APIs released
after the specified deployment target version will be weak-linked
and must be checked for at run-time before they are called.
You can of course set these differently per-architecture.
Thus you can build against the 10.4 Universal SDK and target 10.3.0
just fine by setting your SDKROOT to 10.4u, your
MACOSX_DEPLOYMENT_TARGET to 10.3, and your GCC_VERSION to 3.3. If
you do this, any APIs defined later than 10.3 will be weak-linked
and you will have to be careful not to call any APIs that do not
exist in 10.3.0 in your code. But if you are careful, your code
should run.
-- Chris
All true. I just wanted to add that if you want to build against
10.1.5, you'll need to download the "Xcode Legacy Tools" installer
from the ADC site (and remember to set the gcc version used to
2.95.2). And to note, only 10.2 and later will use weak-linking; it
wasn't available before 10.2.
Also, to be helpful, here's the link to the docs covering cross
development:
<http://developer.apple.com/documentation/DeveloperTools/Conceptual/
cross_development/index.html>
Darkshadow
(aka Michael Nickerson)
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