clang -o test test.c -I/usr/lib/llvm-3.5/include -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -lLLVM-3.5

llvmstuff.c

#include <stdio.h>
#include "llvm-c/Core.h"

int main(int argc, char *argv[]) {
    LLVMBuilderRef builder = LLVMCreateBuilder();
    LLVMModuleRef module = LLVMModuleCreateWithName("main_module");
    LLVMTypeRef main_type = LLVMFunctionType(LLVMVoidType(), NULL, 0, 0);
    LLVMValueRef main_fn = LLVMAddFunction(module, "main", main_type);
    LLVMSetFunctionCallConv(main_fn, LLVMCCallConv);

    char *module_string = LLVMPrintModuleToString(module);
    puts(module_string);

    LLVMDisposeMessage(module_string);
    LLVMDisposeModule(module);
    LLVMDisposeBuilder(builder);
    return 0;
}