[LLVMdev] Problem initializing a JIT via C bindings

[Nick Lewycky]

Keppler, Dave wrote:
> Hi all,
> 
> I have some code that uses the x86 JIT via the C bindings that I'm trying to migrate from targeting LLVM 2.5 to the top of tree, but I'm running into a linking problem I can't figure out.
> 
> Here's how I'm invoking the JIT in 2.5.
> 
> LLVMInitializeNativeTarget(); <-- for the updated version
> LLVMCreateMemoryBufferWithContentsOfFile("code.bc", &buffer, &err);
> LLVMGetBitcodeModuleProvider(buffer, &provider, &err);
> LLVMCreateJITCompiler(&engine, provider, 1, &err);
> 
> After that LLVMFindFunction and RunFunction work wonderfully on 2.5.  The TOT version errors out on the CreateJITCompiler call with a "JIT has not been linked in" message.
> 
> I'm compiling it as follows, which completes with no errors on either LLVM version.
> 
> LLVM_CONFIG=<the llvm-config from the version I want to use>
> gcc `$LLVM_CONFIG --cflags` -o main.o -c main.c
> g++ `$LLVM_CONFIG --cflags` \
>     `$LLVM_CONFIG --ldflags` \
>     main.o `$(LLVM_CONFIG) --libfiles engine BitReader`
> 
> Am I missing some other post 2.5 API change or am I building things wrong?

Add "jit native" to the list of components you're passing to llvm-config.

Nick