[LLVMbugs] [Bug 14199] New: r166836 broke the builld

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14199

             Bug #: 14199
           Summary: r166836 broke the builld
           Product: Build scripts
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: cmake
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: likan_999.student at sina.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Not sure if LLVM has a continuous build system that notifies developers of such
broken build, but the revision has been checked in for 2 days but I haven't
seen any fix for that.

Basically the previous version is good, but this version is broken and latest
version is still broken with the same error.

The error message I got by using CMake is:

../../lib/libLLVMTarget.so: undefined reference to
`llvm::TargetLowering::getVectorTypeBreakdown(llvm::LLVMContext&, llvm::EVT,
llvm::EVT&, unsigned int&, llvm::EVT&) const'


I looked into the code, it is all because of the line 
return TLI->getNumRegisters(Tp->getContext(), TLI->getValueType(Tp));

which makes LLVMTarget depends on LLVMSelectionDAG.  I tried simply adding
target_link_libraries(LLVMTarget LLVMSelectionDAG)
to the CMake, but it doesn't work since it causes circular dependencies.  Not
sure how LLVM deals with such issue.

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