Undefined symbols for architecture armv7 erros in project using zxing GreyscaleLuminanceSource XCode 5

Question

The error in my iOS 7 project, with a Deployment Target = 6.1, that uses the latest ZXingWidget:

Undefined symbols for architecture armv7:
  "zxing::GreyscaleLuminanceSource::GreyscaleLuminanceSource(unsigned char*, int, int, int, int, int, int)", referenced from:
  -[SSAColorCardReader readImage] in SSAColorCardReader.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

The device connected to my Mac is iPhone 5S.

The project is setup as follows: In Target's Build Settings Architecture = Standard, Build Active Architecture Only = NO, and Valid Architectures = armv7.

A post that closely relates to my question and have tried the recommendations with no success is here (SO post). Reviewing this one and others like it and trying out their suggestions I still can't get past this one issue. update* Do you know what I might be doing wrong? *** The ScanTest app works when I compile it for iPhone 5S, so I'm hopeful a solution can be found.

Answer 1

I find a solution:On deployment target iOS7 there seems to be the need to set the compilers to C++ 11 (sdt) as well as libc++ (LLVM)

After switching those settings the build runs successfully