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Re: How to revert xcode version?
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Re: How to revert xcode version?


  • Subject: Re: How to revert xcode version?
  • From: Eric Albert <email@hidden>
  • Date: Thu, 24 Aug 2006 21:00:19 -0700

On Aug 24, 2006, at 10:24 AM, Chris Espinosa wrote:

On Aug 24, 2006, at 9:38 AM, Ken Turkowski wrote:

I upgraded to xcode 2.4, only to find that some code does not link. I tried reverting to 2.3 by removing the entire Developer directory, and reinstalling, but that didn't work. Which method should I use to roll back the xcode version?

Here is the problem that was encountered: All asm code which uses the JMP instruction fails to link, e.g. this doesn't link anymore
     jmp SomeWhere
    nop
SomeWhere:
    nop

a) See the advice from others (which is also documented in the Xcode Release Notes and About Xcode documents).

b) Please explain "doesn't link anymore".  What error are you getting?  

We'd much rather you gathered information and filed a bug on this so we could reproduce and fix it before you regress to 2.3.

Specifically, the Intel assembler in Xcode 2.4 was updated to a modern version of the GNU binutils code, so some assembly code which used invalid syntax and was incorrectly accepted by the previous assembler is no longer accepted.  Of course, there are many improvements to the assembler as well.

In this particular case, however, I'm not seeing the problem you're describing:
black-macbook:~> cat test.s
    jmp SomeWhere
    nop
SomeWhere:
    nop
black-macbook:~> as -o test.o test.s
black-macbook:~> nm test.o
00000006 t SomeWhere
black-macbook:~>

Can you provide another example?

-Eric

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References: 
 >How to revert xcode version? (From: Ken Turkowski <email@hidden>)
 >Re: How to revert xcode version? (From: Chris Espinosa <email@hidden>)

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