[LLVMbugs] [Bug 14119] New: [Objective-C] Unrecognized selector when using categories in static libraries

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14119

             Bug #: 14119
           Summary: [Objective-C] Unrecognized selector when using
                    categories in static libraries
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: badea at adobe.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 9380
  --> http://llvm.org/bugs/attachment.cgi?id=9380
Small setup to reproduce the bug.

Symbols added through the use of Objective-C categories inside static libraries
are not properly linked. This only happens on 64-bit builds.

Steps to reproduce:
1. Compile an objective-c source containing ONLY category methods.
2. Link the object file into a static library.
3. Link an executable/dylib against the static library.

What should happen:
The final binary should contain the category methods from the static library.

What actually happens:
Category methods from the static library are not linked in the final binary.
Running the executable yields unrecognized selector errors.

Possible workarounds:
A possible fix for this is to use force-load when linking the static library.
Another fix is to include a dummy class implementation in the source file
containing the category.

Tested with:
i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3) 
Apple clang version 1.7 (tags/Apple/clang-77) (based on LLVM 2.9svn)
clang svn trunk
Note: on older clang versions -force_load does not fix the problem either.
Also happens in gcc: i686-apple-darwin10-gcc-4.2.1

I've attached a small test project that reproduces the bug.
Build with: "make";

USE_CHUCKNORRIS=1 make; -> this will include a dummy class inside the category
source file, fixing the bug.

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