[LLVMdev] libstdc++ as bytecode, and compiling C++ to C

[Reid Spencer]

On Mon, 2006-11-20 at 17:21 +0800, Mohd-Hanafiah Abdullah wrote:
> On Mon, 2006-11-20 at 17:49 +1100, Emil Mikulic wrote:
> > I've compiled all the object files that make up libstdc++ and libsupc++
> > into LLVM bytecode:
> > 	http://goanna.cs.rmit.edu.au/~emil/libstdcxx.tar.bz2 (438KB)
> > 
> > A simple test program, x.cpp:
> > 
> > 	#include <iostream>
> > 	int main() { std::cout << "hello world\n"; return 0; }
> > 
> > $ llvm-g++ -emit-llvm -c x.cpp
> > $ llvmc -o=out x.o std/*.o sup/*.o
> > $ lli out.bc
> > Segmentation fault (core dumped)
> > $
> > 
> > Oops, no go.  Try a different way:
> > 
> > $ llvm-g++ -emit-llvm -c x.cpp
> > $ llvm-link -o=linked.o x.o std/*.o sup/*.o
> > $ lli linked.o
> > hello world
> 
> Emil:
> 
> Thanks for your email.  I tried the above and got the following errors:
> 
> $ llvm-link -o=linked.o x.o std/*.o sup/*.o
> llvm-link: error loading file 'std/allocator-inst.o'
> 
> And when I do this:
> $ llvmc -o=out x.o std/*.o sup/*.o
> llvm-ld: error: Cannot load file 'std/allocator-inst.o'Bytecode file
> 'std/allocator-inst.o' could not be loaded: Unknown bytecode version
> number: 6 (Vers=6, Pos=13)
> llvmc: Action failed
> 
> 
> I'm using LLVM 1.8.  Is it due to compatibility problem?

Yes. version 6 is the LLVM 1.9 bytecode format and 1.8 doesn't know up
to downgrade it.

> 
> Thanks.
> 
> Napi
> 
> 
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