lli is generating run-time error for clang++ generated IR while the generated executable is not generating run-time error for c++ source code - c++

Question

I am trying to generate a bit code from a c++ source code and running through the just-in-time compiler. When I compile through the clang++ and generate binary executable it runs perfectly but when I generated the bitcode and tried running through the JIT with lli command it generates run-time error. Could you please help me understanding what's going on.
For example: Let example.cpp contains the following code:
#include <iostream>
int main(){
std::cout << "\nHello World!";
return 0;
}
I am using the following command to generate executable which runs perfectly fine.
clang++ example.cpp
I am using the following command to generate the bitcode:
clang++ -S -emit-llvm example.cpp
And then running through the JIT using the following command which generates run-time error:
lli example.ll
I am getting the following access violation error:
Stack dump:
0. Program arguments: lli example.ll
#0 0x00000000025fd9af llvm::sys::PrintStackTrace(llvm::raw_ostream&) /home/xpc/llvm/llvm-project1/llvm-project/llvm/lib/Support/Unix/Signals.inc:564:0
#1 0x00000000025fda42 PrintStackTraceSignalHandler(void*) /home/xpc/llvm/llvm-project1/llvm-project/llvm/lib/Support/Unix/Signals.inc:625:0
#2 0x00000000025fb7ca llvm::sys::RunSignalHandlers() /home/xpc/llvm/llvm-project1/llvm-project/llvm/lib/Support/Signals.cpp:68:0
#3 0x00000000025fd329 SignalHandler(int) /home/xpc/llvm/llvm-project1/llvm-project/llvm/lib/Support/Unix/Signals.inc:406:0
#4 0x00007fa75dbdc390 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
Segmentation fault (core dumped)

Answer 1

Try compiling with clang++ -S -emit-llvm -fno-use-cxa-atexit example.cpp.
I think it's probably because clang and gcc try prefer __cxa_atexit to
atexit by default (these are functions used for cleaning up global objects when a program exits). Meaning you'll get a linker error if your libc implementation doesn't support the former. So disabling the use-cxa-atexit flag should work.

Answer 2

It seems that it's a library linking issue. Try to use the followings:
Try lli -force-interpreter example.ll instead of lli example.ll
When JIT can't work properly, you should try interpreter.
if the following err:
LLVM ERROR: Could not resolve external global address: __dso_handle
Then add -fno-use-cxa-atexit to clang flags, reasons from [LLVMdev] MCJIT/interpreter and iostream.
After retry lli -force-interpreter example.ll if still have some errors like LLVM ERROR: Tried to execute an unknown external function: .... Then you should recompile LLVM with ffi library enabled. See the following for reasons: Advice on Packaging LLVM¶
and [LLVMdev] lli --force-interpreter does not find external function