[LLVMdev] MCJIT vs JT

[Xinglin Zhang]

Compiled the 3.0.0 version of the source code , then tried
lli --use-mcjit irfile.txt

On both windows and linux, I got:
LLVM ERROR: Unknow object format.

If I omit the -use-mcjit option, the command works well. It seems to me
that something about MCJIT is broken in the 3.0.0 version. Also tried to
initialize an ExecutionEngine from code, got errors like "Target does not
support MC emission" on Windows or "Unknow object format" when the
EngineBuilder::create() method is called.

Got the trunk version from svn, compiled and the above lli command
succeeded.

Here are several questions regarding MCJIT and JIT:

1. What does "MC" mean in MCJIT?
2. What is the difference between MCJIT and JIT?
3. According to "Debugging JIT-ed Code With GDB
http://llvm.org/docs/DebuggingJITedCode.html" , we need to use MCJIT in
order to debug the JIT-ed code? Is there any more documentation on this? I
am working on adding DWARF debug information to the IR for a language and I
need to test how gdb works with the IR+DWARF.

Thanks.

-- 
Xinglin Zhang
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