ld: warning: section __DATA/__objc_imageinfo__DATA has unexpectedly large size

Question

Does anyone know what this warning means? It is followed by the error:

Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-gcc-4.2 failed with exit code 1

This is an Xcode project for the iPad. I only see this when I compile for the simulator, not the device. I have linked a static library (*.a) to this project and that is where I think this is failing. Also, it used to run on the simulator without an issue and I am not sure what changed.

All of the compiler output:

Ld /Users/cduckering/Library/Developer/Xcode/DerivedData/IQ-bldfqilntfqfrccozykbqulagovx/Build/Products/Debug-iphonesimulator/IQ.app/IQ normal i386
    cd /Users/cduckering/Desktop/LitePoint/Apps/App/IQ
    setenv MACOSX_DEPLOYMENT_TARGET 10.6
    setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk -L/Users/cduckering/Library/Developer/Xcode/DerivedData/IQ-bldfqilntfqfrccozykbqulagovx/Build/Products/Debug-iphonesimulator -F/Users/cduckering/Library/Developer/Xcode/DerivedData/IQ-bldfqilntfqfrccozykbqulagovx/Build/Products/Debug-iphonesimulator -filelist /Users/cduckering/Library/Developer/Xcode/DerivedData/IQ-bldfqilntfqfrccozykbqulagovx/Build/Intermediates/IQ.build/Debug-iphonesimulator/IQ.build/Objects-normal/i386/IQ.LinkFileList -mmacosx-version-min=10.6 -dead_strip -ObjC -all_load -fprofile-use -Xlinker -objc_abi_version -Xlinker 2 -lCorePlot-CocoaTouch -weak_framework QuickLook -weak_framework MessageUI -framework QuartzCore -framework UIKit -framework Foundation -framework CoreGraphics -Xlinker -object_path_lto -Xlinker /Users/cduckering/Library/Developer/Xcode/DerivedData/IQ-bldfqilntfqfrccozykbqulagovx/Build/Intermediates/IQ.build/Debug-iphonesimulator/IQ.build/Objects-normal/i386/IQ.lto_temporary.o -o /Users/cduckering/Library/Developer/Xcode/DerivedData/IQ-bldfqilntfqfrccozykbqulagovx/Build/Products/Debug-iphonesimulator/IQ.app/IQ

ld: warning: section __DATA/__objc_imageinfo__DATA has unexpectedly large size 368 in /Users/cduckering/Library/Developer/Xcode/DerivedData/IQ-bldfqilntfqfrccozykbqulagovx/Build/Intermediates/IQ.build/Debug-iphonesimulator/IQ.build/Objects-normal/i386/IQ.lto_temporary.o
Assertion failed: (_mode == modeFinalAddress), function finalAddress, file /SourceCache/ld64/ld64-123.2/src/ld/ld.hpp, line 573.
0  0x10001286c  __assert_rtn + 76
1  0x10008c71c  ld::tool::OutputFile::addressOf(ld::Internal const&, ld::Fixup const*, ld::Atom const**) + 188
2  0x10008ed58  ld::tool::OutputFile::applyFixUps(ld::Internal&, unsigned long long, ld::Atom const*, unsigned char*) + 2840
3  0x10008b62e  ld::tool::OutputFile::writeOutputFile(ld::Internal&) + 814
4  0x10008431c  ld::tool::OutputFile::write(ld::Internal&) + 156
5  0x100012e3f  main + 1247
6  0x100000e14  start + 52
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-gcc-4.2 failed with exit code 1

Answer 1

Solved.

This warning and error go away when I change the build setting called "C/C++ Compiler Version" from "LLVM GCC 4.2" to "GCC 4.2".

Answer 2

I get "unexpectedly large size" only when the Build Setting "Link-Time Optimization" (LLVM_LTO = YES) is enabled. I recommend to leave it disabled (the default).