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Re: Cross OS version UB development
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Re: Cross OS version UB development


  • Subject: Re: Cross OS version UB development
  • From: John Daniel <email@hidden>
  • Date: Sat, 24 Feb 2007 11:03:33 -0600


On Feb 24, 2007, at 10:44 AM, Shawn Erickson wrote:


On Feb 24, 2007, at 8:31 AM, John Daniel wrote:

On Feb 24, 2007, at 9:52 AM, Theodore H. Smith wrote:

Hi people,

What's the earliest OS I can cross compile for OS versions? Right now I'm using these settings.

SDKROOT = /Developer/SDKs/MacOSX10.3.9.sdk
MACOSX_DEPLOYMENT_TARGET_i386 = 10.4
SDKROOT_i386 = /Developer/SDKs/MacOSX10.4u.sdk

Now, what if I wanted to let PPC users run my library on MacOS 10.2? Is this possible? Whats the earliest OS I can cross compile for? I'd rather know than test it out for myself because I don't actually have MacOS10.2 or 10.1 or 10.0 installed.

It is probably safer to create two targets in your project, one for Intel only (using 10.4) and one for PPC (10.2) and meld them together using lipo in a 3rd target that has only a run script build phase.

Why? Xcode supports building a UB directly for you (by default Release configuration does this while Debug only build the platform you are running on). You don't need to make it harder on yourself. This capability works fine so I suggest you use it.

Because I'm not an Xcode wizard. I know I can create a 10.4 UB in one step. But I saw those "_i386" setting in the message and didn't recognize them. I thought to myself, "Does Xcode have separate setting for PPC and i386? Are there PPC version of these settings too?" I did a quick Google search and it appears they exist, but I've never seen them before. Is Xcode smart enough to completely ignore a 10.3 SDKROOT when there is an i386-specific SDKROOT? Do I have any Run Script build phases that would depend on plain 'ole SDKROOT?


Instead of taking the time to find out all the definitive answers to those questions, I just say it is "probably safer" to use multiple targets. The original poster may want to study the situation and try building a UB in one step for multiple OS versions. That's fine with me, but I wouldn't do it. It is added time and risk with little benefit.

John

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  • Follow-Ups:
    • Re: Cross OS version UB development
      • From: Shawn Erickson <email@hidden>
References: 
 >Cross OS version UB development (From: "Theodore H. Smith" <email@hidden>)
 >Re: Cross OS version UB development (From: John Daniel <email@hidden>)
 >Re: Cross OS version UB development (From: Shawn Erickson <email@hidden>)

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