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Mac Forum / Programming / CodeWarrior / June 2004CW 8.3 Dynamic library link "overlap"?
CW 8.3 under MacOS 10.3.4 with Xcode 1.2. When I link my CW MacOS X PowerPC MACH-O project I get the following warning in 4 of my similarly configured projects: dynamic library '/usr/lib/libSystem.B.dylib' section '__LINKEDIT' ($90123000-$9017189C) overlaps with dynamic library ' ü»' section '__TEXT' ($90130000-$901E9000) (need to run redo_prebinding) Code seems to run ok (except that stdin appears to be permanently closed in one (but not all) of my projects!!). Any ideas? TIA --alen >CW 8.3 under MacOS 10.3.4 with Xcode 1.2. > [quoted text clipped - 6 lines] >›ü»' section '__TEXT' ($90130000-$901E9000) >(need to run redo_prebinding) Apple reserves some of the addresses you can't use them for your libraries So turn off prebinding for that. >Code seems to run ok (except that stdin appears to be permanently >closed in one (but not all) of my projects!!). Any ideas? Don't have a clue why it would affect that but you might need to prebind a lib to a different address. Ron  SignatureMetrowerks, one of the world¹s top 100 companies and influencers in the software development industry. - SD Times May 2004 http://www.sdtimes.com/2004sdt100.htm Metrowerks, maker of CodeWarrior Ron Liechty - MWRon@metrowerks.com - http://www.metrowerks.com I did not realize I had any control over prebinding and had not prebound any components myself. How do I turn off prebinding and how can I tell what is the name of the second library that the conflict is with (looks like a garbage name to me). TIA (again) --alen > >CW 8.3 under MacOS 10.3.4 with Xcode 1.2. > > [quoted text clipped - 17 lines] > > Ron > I did not realize I had any control over prebinding and had not > prebound any components myself. How do I turn off prebinding and how > can I tell what is the name of the second library that the conflict is > with (looks like a garbage name to me). Turning off prebinding is a bad idea. It will negatively affect the performance of your application. It's an easy answer for Ron to give to you, but it's the wrong one. You are not the first one to run into this -- searching groups.google.com for "codewarrior overlaps with dynamic library" reveals that this has been noted repeatedly on the newsgroup. According to a posting from Josef Wankerl, this is fixed in an update to the CW 9 tools, although he doesn't say which update. meeroh SignatureIf this message helped you, consider buying an item from my wish list: <http://web.meeroh.org/wishlist> Thanks meeroh, I'll try to find the time to upgrade to CW9 (cringe). --alen > > I did not realize I had any control over prebinding and had not > > prebound any components myself. How do I turn off prebinding and how [quoted text clipped - 13 lines] > > meeroh >Turning off prebinding is a bad idea. It will negatively affect the >performance >of your application. It's an easy answer for Ron to give to you, but it's the >wrong one. GUILTY as charged, it was not one of my better responses Here is a much better answer.... Prebinding (which is on by default), requires that all dynamic libraries used by the application don't have addresses which overlap. The dynamic loader can deal with the problem (which is why these are only warnings), but the code will run slow as it will require a dynamic fixup to it's relocations. You should build your dynamic library with a different starting address using the option -seg1addr long, the Metrowerks makes the default for a .dylib to be 0x01 000000 (default for a application/executable is 0x1000). Most of the system libraries are at addresses > 0x80000000 http://developer.apple.com/tools/projectbuilder/Prebinding.html The default prebound address works fine for Applications so leave the "Prebound Address" field blank, it will default to 0x1000 for applications and 0x0100000 for dylibs (the change in default prebound address for dylibs was changed in 8.1 to be 0x0100000 it used to be 0x1000). The only reason you would need to change the default is if you are building more than one dylib, (or using a dylib someone else build which conflicts with the default). There are reasons why a different prebound address would be used for the application, but they are fairly rare. Classic for example uses a different prebound address since it maps in a 9.1 style low memory global variables page, and moves things around so that the memory map mostly looks like it does when actually running in 9.X > least 33 of our internal plugins and possibly more if 3rd party plugins are > available in the user's config. How do I know if overlapping will occur? Also note that plug-ins are never pre-bound. It would be too hard to know ahead of time what addresses some new plug-in should load at, or how the program that loads them might change over time. Perhaps I have implemented it wrong but pre-binding is disabled with Bundles (aka plug-ins). SignatureMetrowerks, one of the world¹s top 100 companies and influencers in the software development industry. - SD Times May 2004 http://www.sdtimes.com/2004sdt100.htm Metrowerks, maker of CodeWarrior Ron Liechty - MWRon@metrowerks.com - http://www.metrowerks.com >I did not realize I had any control over prebinding and had not >prebound any components myself. How do I turn off prebinding and how >can I tell what is the name of the second library that the conflict is >with (looks like a garbage name to me). If you look in your Target Settings for the PPC Mac OS X Target prefernece panel you will see an option to disable prebinding or to set the address for something else. Prebinding (which is on by default), requires that all dynamic libraries used by the application don't have addresses which overlap. The dynamic loader can deal with the problem (which is why these are only warnings), but the code will run slow as it will require a dynamic fixup to it's relocations. You should build your dynamic library with a different starting address using the option -seg1addr long, the Metrowerks makes the default for a .dylib to be 0x01 000000 (default for a application/executable is 0x1000). Most of the system libraries are at addresses > 0x80000000 http://developer.apple.com/tools/projectbuilder/Prebinding.html Ron SignatureMetrowerks, one of the world¹s top 100 companies and influencers in the software development industry. - SD Times May 2004 http://www.sdtimes.com/2004sdt100.htm Metrowerks, maker of CodeWarrior Ron Liechty - MWRon@metrowerks.com - http://www.metrowerks.com > You should build your dynamic library with a different starting address > using the option -seg1addr long, the Metrowerks makes the default for a > .dylib to be 0x01 000000 (default for a application/executable is > 0x1000). Most of the system libraries are at addresses > 0x80000000 The problem, Ron, is that this bogus linker error comes up in CW8 even when you are not using any 3rd party libraries. meeroh SignatureIf this message helped you, consider buying an item from my wish list: <http://web.meeroh.org/wishlist> |
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