https://sourceware.org/bugzilla/show_bug.cgi?id=23607
--- Comment #4 from Richard <rijard.barnes at gmail dot com> ---
A traceback with `gdb` gives:
```
#0 0x00007ffff3879f40 in
llvm::PMTopLevelManager::addImmutablePass(llvm::ImmutablePass*) ()
from /usr/lib/llvm-10/bin/../lib/../lib/libLLVM-10.so.1
#1 0x00007ffff387991f in llvm::PMTopLevelManager::schedulePass(llvm::Pass*) ()
from /usr/lib/llvm-10/bin/../lib/../lib/libLLVM-10.so.1
#2 0x00007ffff469a58e in ?? () from
/usr/lib/llvm-10/bin/../lib/../lib/libLLVM-10.so.1
#3 0x00007ffff469989c in llvm::lto::backend(llvm::lto::Config const&,
std::function<std::unique_ptr<llvm::lto::NativeObjectStream,
std::default_delete<llvm::lto::NativeObjectStream> > (unsigned int)>, unsigned
int, std::unique_ptr<llvm::Module, std::default_delete<llvm::Module> >,
llvm::ModuleSummaryIndex&) () from
/usr/lib/llvm-10/bin/../lib/../lib/libLLVM-10.so.1
#4 0x00007ffff4693434 in
llvm::lto::LTO::runRegularLTO(std::function<std::unique_ptr<llvm::lto::NativeObjectStream,
std::default_delete<llvm::lto::NativeObjectStream> > (unsigned int)>) () from
/usr/lib/llvm-10/bin/../lib/../lib/libLLVM-10.so.1
#5 0x00007ffff4692f22 in
llvm::lto::LTO::run(std::function<std::unique_ptr<llvm::lto::NativeObjectStream,
std::default_delete<llvm::lto::NativeObjectStream> > (unsigned int)>,
std::function<std::function<std::unique_ptr<llvm::lto::NativeObjectStream,
std::default_delete<llvm::lto::NativeObjectStream> > (unsigned int)> (unsigned
int, llvm::StringRef)>) ()
from /usr/lib/llvm-10/bin/../lib/../lib/libLLVM-10.so.1
#6 0x00007ffff749f4ac in ?? () from /usr/lib/llvm-10/bin/../lib/LLVMgold.so
#7 0x000055555567c27f in ?? ()
#8 0x000055555567c3d0 in ?? ()
#9 0x00005555556c1b58 in ?? ()
#10 0x00005555556c1daa in ?? ()
#11 0x0000555555591ee5 in ?? ()
#12 0x00007ffff7ba20b3 in __libc_start_main (main=0x5555555918d0, argc=46,
argv=0x7fffffffd458, init=<optimized out>,
fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffd448)
at ../csu/libc-start.c:308
#13 0x0000555555592ace in ?? ()
```
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