[LLVMbugs] [Bug 11886] New: `llvm-config --libs` includes libraries for all targets, even if only some of those was built

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11886

             Bug #: 11886
           Summary: `llvm-config --libs` includes libraries for all
                    targets, even if only some of those was built
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llvm-config
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: ojab at ojab.ru
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


$ cmake ../llvm -DLLVM_TARGETS_TO_BUILD=X86 -DBUILD_SHARED_LIBS=ON && make
install
…
$ llvm-config --libs
-lLLVMAsmParser -lLLVMHexagonCodeGen -lLLVMHexagonDesc -lLLVMHexagonInfo
-lLLVMMipsAsmParser -lLLVMMipsCodeGen -lLLVMMipsDesc -lLLVMMipsInfo
-lLLVMMipsAsmPrinter -lLLVMInstrumentation -lLLVMLinker -lLLVMArchive
-lLLVMBitReader -lLLVMXCoreCodeGen -lLLVMXCoreDesc -lLLVMXCoreInfo
-lLLVMDebugInfo -lLLVMJIT -lLLVMMSP430CodeGen -lLLVMMSP430Desc -lLLVMMSP430Info
-lLLVMMSP430AsmPrinter -lLLVMipo -lLLVMBitWriter -lLLVMSparcCodeGen
-lLLVMSparcDesc -lLLVMSparcInfo -lLLVMTableGen -lLLVMPowerPCCodeGen
-lLLVMPowerPCDesc -lLLVMPowerPCInfo -lLLVMPowerPCAsmPrinter
-lLLVMCellSPUCodeGen -lLLVMCellSPUDesc -lLLVMCellSPUInfo -lLLVMCBackendCodeGen
-lLLVMCBackendInfo -lLLVMARMDisassembler -lLLVMARMAsmParser -lLLVMARMCodeGen
-lLLVMARMDesc -lLLVMARMAsmPrinter -lLLVMARMInfo -lLLVMX86AsmParser
-lLLVMX86Disassembler -lLLVMX86CodeGen -lLLVMX86Desc -lLLVMX86Info
-lLLVMX86AsmPrinter -lLLVMX86Utils -lLLVMMBlazeAsmParser
-lLLVMMBlazeDisassembler -lLLVMMBlazeCodeGen -lLLVMMBlazeDesc -lLLVMMBlazeInfo
-lLLVMMBlazeAsmPrinter -lLLVMMCDisassembler -lLLVMInterpreter -lLLVMPTXCodeGen
-lLLVMSelectionDAG -lLLVMAsmPrinter -lLLVMMCParser -lLLVMCodeGen
-lLLVMScalarOpts -lLLVMInstCombine -lLLVMTransformUtils -lLLVMipa
-lLLVMAnalysis -lLLVMPTXDesc -lLLVMPTXInfo -lLLVMPTXAsmPrinter
-lLLVMCppBackendCodeGen -lLLVMCppBackendInfo -lgtest_main -lgtest -lLLVMMCJIT
-lLLVMRuntimeDyld -lLLVMExecutionEngine -lLLVMTarget -lLLVMMC -lLLVMObject
-lLLVMCore -lLLVMSupport

Which leads to errors like https://bugs.freedesktop.org/show_bug.cgi?id=44564
because of using `llvm-config --libs` in LDFLAGS
mklib: Making Linux shared library:  r600_dri.so.tmp
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../x86_64-unknown-linux-gnu/bin/ld:
cannot find -lLLVMHexagonCodeGen
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../x86_64-unknown-linux-gnu/bin/ld:
cannot find -lLLVMHexagonDesc


I assume that this can be expected behavior and desired libs should be chosen 
using fine-grained requests like `llvm-config --libs engine bitwriter`, not
sure though.

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