Question

On startup of my application with gdb, I am getting weird errors that look like:

unable to read unknown load command 0x22

The whole trace looks something like this:

[Session started at 2009-12-17 10:28:24 -0500.]
GNU gdb 6.3.50-20050815 (Apple version gdb-966) (Tue Mar 10 02:43:13 UTC 2009)
Copyright 2004 Free Software Foundation, Inc.
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This GDB was configured as "i386-apple-darwin".tty /dev/ttys003
Loading program into debugger…
sharedlibrary apply-load-rules all
warning: Unable to read symbols for "@loader_path/../Frameworks/Sparkle.framework/Versions/A/Sparkle" (file not found).
warning: Unable to read symbols from "Sparkle" (not yet mapped into memory).
unable to read unknown load command 0x22
unable to read unknown load command 0x22
Program loaded.
run
[Switching to process 9051 local thread 0x2e03]
Running…
unable to read unknown load command 0x22
unable to read unknown load command 0x22

I have tried every sort of analysis tool available, haven’t been able to find any memory leaks or anything that could cause these unknown errors.

Help?

Answer 1

This problem has a two part fix.

One make sure that you have Sparkle Copying in in the Copy Frameworks build phase.

Secondly, adding the following script as a buildphase after the Copy Frameworks helps fix the load path on some machines.

install_name_tool -change "@loader_path/../Frameworks/Sparkle.framework/Versions/A/Sparkle" "@executable_path/../Frameworks/Sparkle.framework/Versions/A/Sparkle" "$BUILT_PRODUCTS_DIR/$EXECUTABLE_PATH"

Below is a screenshot of what this buildphase looks like in my project.

Build Phase Example http://grab.by/1OkU

And here is a screenshot of my target steps.

Target Steps http://grab.by/1fCu