I'm trying to start a project based on llvm, but am running into some
difficulties. I started with the 'LLVM Project Guide', but got hung
up in the complexities of configure.ac. I'm now using llvm-config to
provide the linker directives, but this results in undefined
references:
$ llvm-g++ `$HOME/local/bin/llvm-config --cppflags --ldflags --libs
bitwriter` ModuleMaker.cpp
Yields:
/tmp/ccjh9OY1.o: In function `main':
ModuleMaker.cpp:(.text+0x13): undefined reference to
`llvm::LLVMContext::LLVMContext()'
ModuleMaker.cpp:(.text+0x66): undefined reference to
`llvm::Module::Module(llvm::StringRef, llvm::LLVMContext&)'
ModuleMaker.cpp:(.text+0x7a): undefined reference to
`llvm::Type::getInt32Ty(llvm::LLVMContext&)'
...
For reference:
$ $HOME/local/bin/llvm-config --cppflags --ldflags --libs bitwriter
-I/home/e0082888/local/include -D_DEBUG -D_GNU_SOURCE
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS
-L/home/e0082888/local/lib -lpthread -ldl -lm
-lLLVMBitWriter -lLLVMCore -lLLVMSupport -lLLVMSystem
I also get the same result if I remove 'bitwriter' from the
llvm-config argument list so as to link with all libraries.
Any suggestions? BTW, my llvm-g++ is from a ubuntu package, whereas
as the libraries I'm attempting to link against (2.7) were compiled
and installed locally. I've also tried g++ in place of llvm-g++, but
the results are the same.
Thanks for any help.
-Tom
Hi Tom,
I'm trying to start a project based on llvm, but am running into some
difficulties. I started with the 'LLVM Project Guide', but got hung
up in the complexities of configure.ac. I'm now using llvm-config to
provide the linker directives, but this results in undefined
references:
$ llvm-g++ `$HOME/local/bin/llvm-config --cppflags --ldflags --libs
bitwriter` ModuleMaker.cpp
Yields:
/tmp/ccjh9OY1.o: In function `main':
ModuleMaker.cpp:(.text+0x13): undefined reference to
`llvm::LLVMContext::LLVMContext()'
ModuleMaker.cpp:(.text+0x66): undefined reference to
`llvm::Module::Module(llvm::StringRef, llvm::LLVMContext&)'
ModuleMaker.cpp:(.text+0x7a): undefined reference to
`llvm::Type::getInt32Ty(llvm::LLVMContext&)'
I'm pretty sure that the LLVMContext constructor is defined in libLLVMCore.a
What is the output of `llvm-config --libs bitwriter`? Does it include
-lLLVMCore?
Ciao,
Duncan.
PS: There should be no need to use llvm-g++ rather than g++. If it makes a
difference, then that is a bug.
Hi Duncan,
e0082888@e0082888-laptop:~$ local/bin/llvm-config --libs bitwriter
-lLLVMBitWriter -lLLVMCore -lLLVMSupport -lLLVMSystem
I verified it's pulling from the right library directory, because if I
hide libLLVMCore.a from view and I get:
e0082888@e0082888-laptop:~/projects/llvm-hs/tools/ModuleMaker$ g++
`$HOME/local/bin/llvm-config --cppflags --cxxflags --ldflags --libs
bitwriter` ModuleMaker.cpp
/usr/bin/ld: cannot find -lLLVMCore
collect2: ld returned 1 exit status
And libLLVMCore.a contains at least something related to LLVMContext:
e0082888@e0082888-laptop:~/local/lib$ objdump -h libLLVMCore.a | grep
LLVMContext
LLVMContext.o: file format elf32-i386
313 .text._ZN4llvm15LLVMContextImplC1ERNS_11LLVMContextE 00001199
00000000 00000000 00007420 2**4
314 .text._ZN4llvm14object_creatorINS_11LLVMContextEEEPvv 0000003a
00000000 00000000 000085c0 2**4
319 .text._ZN4llvm15LLVMContextImplD1Ev 0000159d 00000000 00000000
00008900 2**4
320 .text._ZN4llvm14object_deleterINS_11LLVMContextEE4callEPv 0000003a
00000000 00000000 00009ea0 2**4
Here is the contents of my local library directory:
e0082888@e0082888-laptop:~$ ls -1 local/lib
libCompilerDriver.a
libEnhancedDisassembly.a
libEnhancedDisassembly.so
libllvm.a
libLLVMAlphaAsmPrinter.a
libLLVMAlphaCodeGen.a
libLLVMAlphaInfo.a
libllvm_analysis.a
libLLVMAnalysis.a
libLLVMArchive.a
libLLVMARMAsmParser.a
libLLVMARMAsmPrinter.a
libLLVMARMCodeGen.a
libLLVMARMInfo.a
libLLVMAsmParser.a
libLLVMAsmPrinter.a
libllvm_bitreader.a
libLLVMBitReader.a
libllvm_bitwriter.a
libLLVMBitWriter.a
libLLVMBlackfinAsmPrinter.a
libLLVMBlackfinCodeGen.a
libLLVMBlackfinInfo.a
libLLVMCBackend.a
libLLVMCBackendInfo.a
libLLVMCellSPUAsmPrinter.a
libLLVMCellSPUCodeGen.a
libLLVMCellSPUInfo.a
libLLVMCodeGen.a
libLLVMCore.a
libLLVMCppBackend.a
libLLVMCppBackendInfo.a
libllvm_executionengine.a
libLLVMExecutionEngine.a
libLLVMHello.so
libLLVMInstCombine.a
libLLVMInstrumentation.a
libLLVMInterpreter.a
libLLVMipa.a
libLLVMipo.a
libLLVMJIT.a
libLLVMLinker.a
libLLVMMBlazeAsmPrinter.a
libLLVMMBlazeCodeGen.a
libLLVMMBlazeInfo.a
libLLVMMC.a
libLLVMMCParser.a
libLLVMMipsAsmPrinter.a
libLLVMMipsCodeGen.a
libLLVMMipsInfo.a
libLLVMMSIL.a
libLLVMMSILInfo.a
libLLVMMSP430AsmPrinter.a
libLLVMMSP430CodeGen.a
libLLVMMSP430Info.a
libLLVMPIC16AsmPrinter.a
libLLVMPIC16CodeGen.a
libLLVMPIC16Info.a
libLLVMpic16passes.a
libLLVMPowerPCAsmPrinter.a
libLLVMPowerPCCodeGen.a
libLLVMPowerPCInfo.a
libllvm_scalar_opts.a
libLLVMScalarOpts.a
libLLVMSelectionDAG.a
libLLVMSparcAsmPrinter.a
libLLVMSparcCodeGen.a
libLLVMSparcInfo.a
libLLVMSupport.a
libLLVMSystem.a
libLLVMSystemZAsmPrinter.a
libLLVMSystemZCodeGen.a
libLLVMSystemZInfo.a
libllvm_target.a
libLLVMTarget.a
libLLVMTransformUtils.a
libLLVMX86AsmParser.a
libLLVMX86AsmPrinter.a
libLLVMX86CodeGen.a
libLLVMX86Disassembler.a
libLLVMX86Info.a
libLLVMXCoreAsmPrinter.a
libLLVMXCoreCodeGen.a
libLLVMXCoreInfo.a
libLTO.a
libLTO.so
libplugin_llvmc_Base.a
libplugin_llvmc_Clang.a
libprofile_rt.so
libUnitTestMain.a
ocaml
I'm still at a loss regarding the llvm undefined references. I
reinstalled llvm-2.7, but the results are the same. Do I need any
special configure options to enable the libraries to be compiled
correctly for linking with custom tools?
Again, here is what I'm attempting as a test of the compilation and
linking process:
$ llvm-g++ `$(HOME)/llvm/bin/llvm-config --cxxflags --ldflags --libs
bitwriter` ModuleMaker.cpp
And here is what I get:
/tmp/ccpwMjBS.o: In function `main':
ModuleMaker.cpp:(.text+0x1d): undefined reference to
`llvm::LLVMContext::LLVMContext()'
ModuleMaker.cpp:(.text+0x4f): undefined reference to
`llvm::Module::Module(llvm::StringRef, llvm::LLVMContext&)'
ModuleMaker.cpp:(.text+0x59): undefined reference to
`llvm::Type::getInt32Ty(llvm::LLVMContext&)'
...
The llvm-config command returns the following:
-I/home/e0082888/llvm/include -D_DEBUG -D_GNU_SOURCE
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -O2
-fomit-frame-pointer -fno-exceptions -fno-rtti -fPIC
-Woverloaded-virtual
-L/home/e0082888/llvm/lib -lpthread -ldl -lm
-lLLVMBitWriter -lLLVMCore -lLLVMSupport -lLLVMSystem
What am I doing wrong? Any help would be appreciated.
Thanks.
-Tom