Hi! I’m facing issues while bulding lldb 18 from source. Previously I compiled lldb 16 and it was working fine. I’ve followed this link:
https://lldb.llvm.org/resources/build.html
The error comes at the very end:
Linking CXX shared library lib/liblldb.so.18.0.0git
FAILED: lib/liblldb.so.18.0.0git
Any ideas on how to resolve this issue.
Can you post your full build log? It could be any number of different issues.
This is my build log for the error. I have not recorded logs for the complete build. There were only warnings and no errors. Will this be sufficient or should I build again and record the complete build.log:
[1/7] Linking CXX shared library lib/liblldb.so.18.0.0git
FAILED: lib/liblldb.so.18.0.0git
: && /usr/bin/c++ -fPIC -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -fno-lifetime-dse -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -Wno-deprecated-declarations -Wno-unknown-pragmas -Wno-strict-aliasing -Wno-stringop-truncation -g -Wl,-z,defs -Wl,-z,nodelete -Wl,-rpath-link,/home/talha/Downloads/llvm-project-main/build/./lib -Wl,–version-script,“/home/talha/Downloads/llvm-project-main/build/tools/lldb/source/API/liblldb.exports” -shared -Wl,-soname,liblldb.so.18git -o lib/liblldb.so.18.0.0git tools/lldb/source/API/CMakeFiles/liblldb.dir/SBAddress.cpp.o 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lib/libclangRewrite.a lib/libclangSerialization.a lib/libclangSema.a lib/libclangEdit.a lib/libclangAnalysis.a lib/libclangASTMatchers.a lib/libclangSupport.a lib/libLLVMFrontendHLSL.a lib/libclangAST.a lib/libLLVMFrontendOpenMP.a lib/libLLVMScalarOpts.a lib/libLLVMAggressiveInstCombine.a lib/libLLVMInstCombine.a lib/libLLVMTransformUtils.a lib/libLLVMAnalysis.a lib/libLLVMProfileData.a lib/libLLVMSymbolize.a lib/libLLVMDebugInfoDWARF.a lib/libLLVMDebugInfoBTF.a lib/libLLVMDebugInfoPDB.a lib/libLLVMObject.a lib/libLLVMIRReader.a lib/libLLVMBitReader.a lib/libLLVMAsmParser.a lib/libLLVMCore.a lib/libLLVMRemarks.a lib/libLLVMBitstreamReader.a lib/libLLVMMCParser.a lib/libLLVMTextAPI.a lib/libLLVMDebugInfoMSF.a lib/libclangLex.a lib/libclangBasic.a lib/liblldbUtility.a lib/libLLVMMCDisassembler.a lib/libLLVMMC.a lib/libLLVMBinaryFormat.a lib/libLLVMTargetParser.a lib/libLLVMDebugInfoCodeView.a lib/libLLVMSupport.a lib/libLLVMDemangle.a -ldl /usr/lib/x86_64-linux-gnu/libz.so -lrt -lm /usr/lib/x86_64-linux-gnu/libtinfo.so && :
collect2: fatal error: ld terminated with signal 9 [Killed]
compilation terminated.
ninja: build stopped: subcommand failed.
Great, this is the cause then:
collect2: fatal error: ld terminated with signal 9 [Killed]
compilation terminated.
This almost always means that the linker, ld has used too much RAM across however many copies of it were launched, and the system has killed one of them to recover some memory.
Couple of ways around that.
Given you already have a build you could limit how many parallel processes are launched by using ninja -j<some number less than your number of processors> (run nproc to see how many you have). If you configured with make then make -j<N> also works.
This means you don’t have to rebuild everything, it’ll just try the link again right away.
The other option is to use lld as your linker instead. See LLVM_ENABLE_LLD in Building LLVM with CMake — LLVM 18.0.0git documentation. lld has a lower memory footprint than ld.
This requires a reconfigure and probably a rebuild.
This requires a reconfigure and probably a rebuild.
If you decide to go ahead and reconfigure you may also want to consider using LLVM_PARALLEL_LINK_JOBS=<N> to limit the number of parallel link jobs.
That line (specifically 1/7) tells me there aren’t any other links going on at the same time. Ninja isn’t building anything but liblldb.so.
How much RAM do you have? Can you quit other programs using a lot?
I’d look into using lld instead of GNU ld. It’s much faster (especially with a debug build) and uses less memory.
Me too, I have built clang++ with CUDA support , but I noticed LLDB was not built even though I asked for it in the configuration stage.
attempting to build LLDB from its location at <>/llvm/lldb/build
with commands
cmake -G “Unix Makefiles” -DLLDB_ENABLE_PYTHON=1 -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_COMPILER=clang -DLLDB_INCLUDE_TESTS=1 -DLLDB_INCLUDE_UNITTESTS=1 -DLLDB_BUILD_INTEL_PT=0 $DPCPP_HOME/llvm/lldb
make lldb -j 8
yields the following error:
…
[ 88%] Building CXX object source/Plugins/Process/Linux/CMakeFiles/lldbPluginProcessLinux.dir/SingleStepCheck.cpp.o
Consolidate compiler generated dependencies of target liblldb
make[2]: *** No rule to make target ‘lib/libLLVMMCJIT.a’, needed by ‘lib/liblldb.so.18.0.0git’. Stop.
make[1]: *** [CMakeFiles/Makefile2:9522: source/API/CMakeFiles/liblldb.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs…
And the LLDB debugger fails to build.
I am a newbie on LLVM …
My question would be : Which tag should we checkout in branch SYCL in order to fetch LLVM-17 release? And how to build LLDB from it ? Am I doing it right ?
Thanks for reading.
My guess is the clang project isn’t enabled, so the expression parser won’t be built. Add this to your cmake line:
-DLLVM_ENABLE_PROJECTS=“llvm;clang;lldb”
Seel Building - 🐛 LLDB for more info.
Also, I’d suggest building outside the llvm tree, to keep builds and source separated. I like to put my build directory at the same level as llvm_project.
Not sure about your specific case but here you can find successful builds:
For instance, for lldb-aarch64-ubuntu
Go for the successful build => cmake config => view all lines => scroll up to see the configuration command.