[LLVMbugs] [Bug 4465] New: offsetof() inconsistent with gcc on ParamBlockRec from Carbon headers

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4465

           Summary: offsetof() inconsistent with gcc on ParamBlockRec from
                    Carbon headers
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: alexei.svitkine at gmail.com
                CC: llvmbugs at cs.uiuc.edu


If you include Carbon headers, and try the following with GCC and clang:

 offsetof(struct IOParam, ioVRefNum)

The result with GCC is 22, while the result with clang is 24.

This bug makes it impossible to call, for example PBReadSync(), which takes a
ParamBlockRec parameter, because the user application fills in that structure
at different offsets (clang) than the library code (gcc).


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