The tool that builds dSYM's was rewritten (moving it from a Apple internal tool 
to one hosted by the llvm project) between 6.x and 7.x (the new version is 
called llvm-dsymutil).  The old dsymutil is still around in:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/dsymutil-classic

The dsymutil in that directory is a symlink to llvm-dsymutil.  You might try 
flipping the symlink back to dsymutil-classic and see if you still get the 
error.  If you don't then please file a bug about this, the new & old dsymutils 
should behave the same way.

Jim

> On Sep 9, 2015, at 4:07 PM, Steve Christensen <[email protected]> wrote:
> 
> I'm finally getting around to building an existing app project with Xcode 7. 
> This particular project includes another project, as a dependency, that 
> builds a third-party static library, which is then linked into the app.
> 
> With Xcode 6.4 (and earlier), the generate dSYM task has always completed 
> with no warnings.
> 
> With Xcode 7.0b6, I get a bunch (146) of warnings, one for each of the object 
> files:
> 
>       warning: (i386) .../libFoo.a(someObjectFile.o) unable to open object 
> file: No such file or directory
>       ...
>       warning: (x86_64) .../libFoo.a(someObjectFile.o) unable to open object 
> file: No such file or directory
>       ...
> 
> The static library project puts the resulting .a file into one directory and 
> all the .o files into another one, if that makes a difference. Is there a new 
> Xcode 7 target build setting that I missed or an older one that now is used 
> when searching for object files?
> 
> Steve
> 
> 
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