Open Radar

 
Summary:
When linking to a particular static library (included with attached project), the linker fails to report which symbols are involved in link errors triggered by unrelated files.

Steps to Reproduce:
Build both targets (shylinker and happylinker) in the attached project.

Expected Results:
Both targets should fail to build with a linker error along the lines of:
Undefined symbols for architecture x86_64:
  "_ThisFunctionIsNotDefined", referenced from:
      _main in main.o
ld: symbol(s) not found for architecture x86_64

Actual Results:
happylinker produces the expected error message. shylinker produces a much less helpful message:
ld: '_main' in /.../shylinker.build/Objects-normal/x86_64/main.o contains undefined reference for architecture x86_64

Regression:
I believe this happened in Xcode 4.5.0. I don't remember if I saw it in 4.4.

Notes:
Both targets have the same link error, and both link to the static library. The difference is that only shylinker contains a separate source file which contains a function that calls into the static library. That file is not involved in any link errors. The setup is described in more detail in the included README.txt file.



Attachment:
http://jens.ayton.se/code/files/shylinker.zip