[LLVMbugs] [Bug 844] NEW: Internal compiler error with Objective-C++ and -fobjc-gc

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Tue Jul 25 16:27:18 PDT 2006


           Summary: Internal compiler error with Objective-C++ and -fobjc-gc
           Product: tools
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: llvm-g++
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: mark+llvm.org at bdash.net.nz

The following Objective-C++ file causes a reproducible internal compiler error when compiled with 
llvm-gcc4 revision 17 from <svn://anonsvn.opensource.apple.com/svn/llvm/>.  The error is only 
generated when -fobjc-gc is passed to g++.  This occurs even when llvm-gcc4 is built *without* LLVM 
support enabled.

I initially filed this bug with Apple at <http://bugreporter.apple.com/> as <rdar://problem/4622335>, 
but they asked that I file it over here.

template<typename T> void foo(T v) { snprintf(v); }

Steps to Reproduce: 
1. Put the snippet above in test.mm
2. /path/to/llvm-gcc/bin/g++ -c -o test-no-objc-gc.o test.mm
3. /path/to/llvm-gcc/bin/g++ -c -fobjc-gc -o test-objc-gc.o test.mm

Expected Results: 
I expect test-no-objc-gc.o to be created in step 2, and test-objc-gc.o in step 3.

Actual Results: 
test-no-objc-gc.o is created in step 2, but step 3 results in an internal compiler error:

test.mm: In function ‘void foo(T)’:
test.mm:1: internal compiler error: Bus error
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://developer.apple.com/bugreporter> for instructions.

This does not occur with:
i686-apple-darwin8-g++-4.0.1 (GCC) 4.0.1 (Apple Computer, Inc. build 5341)

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