Universal binary with x86_64 for 10.6 only
Universal binary with x86_64 for 10.6 only
- Subject: Universal binary with x86_64 for 10.6 only
- From: BJ Homer <email@hidden>
- Date: Wed, 20 Jan 2010 15:41:46 -0700
I'm building a command-line tool, and I want it to run 32-bit on Tiger and Leopard and 64-bit on Snow Leopard. I have set the Base SDK to be 10.4, with a conditional build setting on x86_64 for 10.6. I have done the same for the deployment target; 10.4 generally, 10.6 for x86_64.
When I run the binary on Snow Leopard, it works fine. When I run it on Leopard, I get the following error:
Dyld Error Message: unknown required load command 0x80000022
I've used otool to inspect the binary. It appears that the unknown required load command is LC_DYLD_INFO_ONLY. On the Leopard machine, `otool -lv -arch x86_64 <binary>` shows the unknown command. Running the same command on Snow Leopard shows LC_DYLD_INFO_ONLY in the same place. So I've verified that I can identify it. When I run it with -arch i386, the command isn't there. This is what I expected; the x86_64 build is targeted for 10.6 only, so it's fine if SL-only load commands are present there.
The problem: Running the binary from the command line on Leopard crashes. In the crash report it's apparent that it's attempting to run the x86_64 version, even though that one has a deployment target of 10.6.
I've found the LSMinimumSystemVersionByArchitecture key that can be put into an app bundle's Info.plist, but this is a flat file. I tried embedding the Info.plist inside the flat binary, but it didn't seem to make a difference.
Am I doing something wrong? I had thought that when running a universal binary, it would look through all the binaries and find the best choice that it can run. Since x86_64 is linked against the 10.6 SDK, I had thought it would pass over that and use the 10.5 SDK. Is this incorrect?
Any ideas?
-BJ Homer
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