MaskRay added a comment. In D127142#3592207 <https://reviews.llvm.org/D127142#3592207>, @yaxunl wrote:
> In D127142#3590874 <https://reviews.llvm.org/D127142#3590874>, @yaxunl wrote: > >> In D127142#3571260 <https://reviews.llvm.org/D127142#3571260>, @MaskRay >> wrote: >> >>> In D127142#3570290 <https://reviews.llvm.org/D127142#3570290>, @yaxunl >>> wrote: >>> >>>> If I use --rtlib=compiler-rt, does that also requires >>>> --unwindlib=unwindlib ? >>> >>> No. --unwindlib=libunwind requires --rtlib=compiler-rt. --rtlib=compiler-rt >>> is compatible with both --unwindlib=libgcc and --unwindlib=libunwind. >> >> If only use -rtlib=compiler-rt without changing unwind lib, I will get >> missing symbol: >> >> [2022-06-16T20:05:28.644Z] ld.lld: error: undefined symbol: _Unwind_Resume >> >> [2022-06-16T20:05:28.644Z] >>> referenced by main.cpp >> >> [2022-06-16T20:05:28.644Z] >>> >> CMakeFiles/MIOpenDriver.dir/main.cpp.o:(generate_skipahead_file()) >> >> [2022-06-16T20:05:28.644Z] >>> referenced by main.cpp >> >> [2022-06-16T20:05:28.644Z] >>> >> CMakeFiles/MIOpenDriver.dir/main.cpp.o:(main) >> >> [2022-06-16T20:05:28.644Z] >>> referenced by main.cpp >> >> [2022-06-16T20:05:28.644Z] >>> >> CMakeFiles/MIOpenDriver.dir/main.cpp.o:(std::function<void (float&, float, >> bool&)> reduce::ReduceOpFn2<float>(miopenReduceTensorOp_t)) >> >> [2022-06-16T20:05:28.644Z] >>> referenced 1246 more times >> >> [2022-06-16T20:05:28.644Z] >> >> [2022-06-16T20:05:28.644Z] ld.lld: error: ../lib/libMIOpen.so.1.0.50300: >> undefined reference to _Unwind_Resume [--no-allow-shlib-undefined] >> >> [2022-06-16T20:05:28.644Z] ld.lld: error: ../lib/libMIOpen.so.1.0.50300: >> undefined reference to _Unwind_Backtrace [--no-allow-shlib-undefined] >> >> [2022-06-16T20:05:28.644Z] ld.lld: error: ../lib/libMIOpen.so.1.0.50300: >> undefined reference to _Unwind_GetIP [--no-allow-shlib-undefined] >> >> [2022-06-16T20:05:28.644Z] clang-15: error: linker command failed with exit >> code 1 (use -v to see invocation) > > If I use --rtlib=compiler-rt, do I have to explicitly add --unwindlib=libgcc > or --unwindlib=libunwind? I suspect the linker is not linking the unwind > library when -rtlib=compiler-rt is specified. Either is fine. If --rtlib=libgcc, --unwindlib must be libgcc (platform defaults to libgcc on Linux). --rtlib and --unwindlib are orthogonal. To use libunwind, specify --unwindlib. CHANGES SINCE LAST ACTION https://reviews.llvm.org/D127142/new/ https://reviews.llvm.org/D127142 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
