llvm dev - Nov 2006 - [LLVMdev] libstdc++ as bytecode, and compiling C++ to C

Emil:

I'm using LLVM 1.9 now.  When I tried to do what you did I got the
following though:

$ llvm-g++ -emit-llvm -c x.cpp
$ llvm-link -o=linked.o x.o std/*.o sup/*.o
WARNING: Linking two modules of different target triples!
WARNING: Linking two modules of different target triples!
WARNING: Linking two modules of different target triples!
...

$ lli linked.o
lli((anonymous namespace)::PrintStackTrace()+0x19)[0x846d7f9]
lli(llvm::MachineFunctionPass::runOnFunction(llvm::Function&)+0x29)[0x811af59]
Segmentation fault


What could be the problem?

Thanks.

Napi

On Tue, Nov 21, 2006 at 05:33:32PM +0800, Mohd-Hanafiah Abdullah
wrote:
> Emil:
> 
> I'm using LLVM 1.9 now.  When I tried to do what you did I got the
> following though:
> 
> $ llvm-g++ -emit-llvm -c x.cpp
> $ llvm-link -o=linked.o x.o std/*.o sup/*.o
> WARNING: Linking two modules of different target triples!
> WARNING: Linking two modules of different target triples!
> WARNING: Linking two modules of different target triples!
> ...
> 
> $ lli linked.o
> lli((anonymous namespace)::PrintStackTrace()+0x19)[0x846d7f9]
>
lli(llvm::MachineFunctionPass::runOnFunction(llvm::Function&)+0x29)[0x811af59]
> Segmentation fault
> 
> 
> What could be the problem?
I don't know.  =/

All my bytecode files are built for:

	target datalayout = "e-p:32:32"
	target endian = little
	target pointersize = 32
	target triple = "i386-portbld-freebsd7.0"

Build a small bytecode file on your end, disassemble it, and compare.
(llvm-dis < yourfile.o | head -5)

LLVMers, given the same endianness and pointersize, can one mix and
match LLVM bytecode files produced on different platforms?

--Emil

On Tue, 21 Nov 2006, Emil Mikulic wrote:
> LLVMers, given the same endianness and pointersize, can one mix and
> match LLVM bytecode files produced on different platforms?
No, not in general.  For example, on the mac, printf it often #defined to 
printf$ldbl, which doesn't exist on linux.  System headers generally foil 
the ability to move stuff around like that.

-Chris

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