On 30 August 2017 at 13:12, Tamas Berghammer via lldb-dev <lldb-dev@lists.llvm.org> wrote: > I tried to build using the following command what should be a reasonably > close approximation to the one you used (I don't have ICU installed at the > moment) and it still links fine for me: > CC=/usr/bin/clang CXX=/usr/bin/clang++ cmake -G Ninja ../../llvm > -DBUILD_SHARED_LIBS=true -DLLVM_TARGETS_TO_BUILD='X86' > -DCMAKE_BUILD_TYPE=Debug -DLLVM_ENABLE_ASSERTIONS=TRUE > -DLLVM_OPTIMIZED_TABLEGEN=ON > > It would be great to understand what exactly causes the difference between > the 2 cases by some sort of bisecting as I see nothing in the source code > what would explain this. If changing from -DCMAKE_BUILD_TYPE=Debug to > -DCMAKE_BUILD_TYPE=Release fixes the issue then it would be nice to diff the > ninja build graph and the different cmake caches to try to figure out where > the different starts.
Debug info tends to alter the order in which the linker pulls in object files from archives (which matters a lot when you have a large number of cyclical inter-archive dependencies like we do). In the past I have needed to increase the LINK_INTERFACE_MULTIPLICITY property to make lldb build in debug mode (although the release mode was fine). It is possible increasing that number will fix things (source/Core/CMakeLists.txt). > > Tamas > > On Wed, Aug 30, 2017 at 12:17 PM Peeter Joot <peeterj...@protonmail.com> > wrote: >> >> Hi Tamas, >> >> It looks like lldb-server only fails if I build with a Debug >> configuration, which I didn't realize until now. In Release configuration, >> I don't need any changes to CMakefiles and lldb-server links without error. >> My full build configuration in debug mode was: >> >> mkdir lldb50.1708110153 >> >> cd lldb50.1708110153 >> >> PATH=$PATH:/opt/lzlabs/bin >> >> CC=/usr/bin/clang CXX=/usr/bin/clang++ cmake \ >> >> -G \ >> >> Ninja \ >> >> ../llvm \ >> >> -DBUILD_SHARED_LIBS=true \ >> >> -DLLVM_TARGETS_TO_BUILD='X86' \ >> >> -DCMAKE_BUILD_TYPE=Debug \ >> >> -DLLVM_ENABLE_ASSERTIONS=TRUE \ >> >> -DCMAKE_INSTALL_PREFIX=/home/pjoot/clang/lldb50.1708110153 \ >> >> -DLLVM_OPTIMIZED_TABLEGEN=ON \ >> >> -DICU_LIBRARY=/opt/lzlabs/lib64 \ >> >> -DICU_INCLUDE_DIR=/opt/lzlabs/include >> >> Without any changes LLVMRuntimeDyld is not in the lldb-server link list, >> so this is not an ordering issue. I'm not sure why this ends up as an issue >> only with Debug. >> >> -- >> Peeter >> > > _______________________________________________ > lldb-dev mailing list > lldb-dev@lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev > _______________________________________________ lldb-dev mailing list lldb-dev@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
