[LLVMbugs] [Bug 5482] New: StringRef is miscompiled by gcc-4.2 and gcc-4.3.1

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5482

           Summary: StringRef is miscompiled by gcc-4.2 and gcc-4.3.1
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Support Libraries
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: daniel at zuster.org
                CC: llvmbugs at cs.uiuc.edu


The attached example is miscompiled by gcc-4.2 and gcc-4.3.1. This is probably
bad enough that we should find a workaround.

In this particular example the problem only occurs when the string split
results in an empty LHS (I think).
--
ddunbar at ozzy:StringRef$ g++ -I $(llvm-config --src-root)/include $(llvm-config
--cppflags) harness.cpp splitlines.cpp && ./a.out
0: string (5): 'hello'
1: string (5): 'world'
2: string (1): 'a'
3: string (5): 'hello'
4: string (0): ''
5: string (5): 'world'
6: string (1): 'a'
7: string (0): ''
ddunbar at ozzy:StringRef$ g++ -O2 -I $(llvm-config --src-root)/include
$(llvm-config --cppflags) harness.cpp splitlines.cpp && ./a.out
0: string (5): 'hello'
1: string (10): '
world
a

'
2: string (5): 'world'
3: string (1): 'a'
4: string (1): '
'
5: string (5): 'hello'
6: string (10): '
world
a

'
7: string (5): 'world'
8: string (1): 'a'
9: string (1): '
'
ddunbar at ozzy:StringRef$ 
--


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