Undefined Symbols for Architecture X86_64 on Xcode 6.1

Undefined symbols for architecture x86_64 on Xcode 6.1

Apparently, your class "Format" is involved in the problem. Check your declaration of this class, especially if you did it inside another class you probably forgot the @implementation or something similar.

Undefined symbols for architecture x86_64 on Xcode 6.3

I downloaded and tried to build your project. Looking at the link errors - init_stack_remove_data not found, for example - they're correct. There is no definition of init_stack_remove_data anywhere in your project source.

In the "nm -arch x86_64" output that you cite above, please note that the "U" before a function definition indicates a use of that function, not a definition of it. The nm output is showing that the linker is correct - those functions are called by your code, but are never defined. When they're defined, you'll see a "T" before the function in the nm output.

You need to update your project with the rest of the necessary source before it'll link without errors.

Xcode 9 undefined symbols for architecture x86_64

When I ran build for profiling, it was working, but with classic build there were mentioned errors. After searching through logs it seems there is some weird behaviour with flags, particularly -fprofile-instr-generate. The solution was to set flag Enable Code Coverage to No in build settings of the library project. This was shooting into the dark but somehow got it working.

Undefined symbols for architecture x86_64 when using ORKESerializer

It looks like by default, the ORKESerializer class isn't part of the ResearchKit framework. (See this comment.) It may be included in the tests, however.

To use it in your app, the code needs to be compiled/linked in, so you need to add ORKESerialization.m to one of your targets.

Xcode 6.1 Missing required architecture X86_64 in file

• The first thing you should make sure is that your static library has all architectures. When you do a lipo -info myStaticLibrary.a on terminal - you should see armv7 armv7s i386 x86_64 arm64 architectures for your fat binary.

• To accomplish that, I am assuming that you're making a universal binary - add the following to your architecture settings of static library project -

• So, you can see that I have to manually set the Standard architectures (including 64-bit) (armv7, armv7s, arm64) of the static library project.

• Alternatively, since the normal $ARCHS_STANDARD now includes 64-bit. You can also do $(ARCHS_STANDARD) and armv7s. Check lipo -info without it, and you'll figure out the missing architectures. Here's the screenshot for all architectures -

• For your reference implementation (project using static library). The default settings should work fine -

  

Update 12/03/14
Xcode 6 Standard architectures exclude armv7s.

So, armv7s is not needed? Yes. It seems that the general differences between armv7 and armv7s instruction sets are minor. So if you choose not to include armv7s, the targeted armv7 machine code still runs fine on 32 bit A6 devices, and hardly one will notice performance gap. Source

If there is a smarter way for Xcode 6.1+ (iOS 8.1 and above) - please share.

FFMPEG binaries throw error : Undefined Symbols for Architecture x86_64

I added Frameworks :

AudioToolBox.framework and VideoToolBox.framework

How i understood : Undefined symbol for architecture x86_64 : A referenced from B in xyz.o

Add xyz.framework

and its Done :)

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