c - How compile a llvm code file using functions from C?

Question

Is there a way for compile a file in llvm (*.ll) that uses functions in C?

I created a test using check C and I compile it as:

$clang  counter_i.c counter_test_check.c   -lcheck

This way, I am using the libraries from check, but I need produce the llvm code that uses the library from check. When I try this command:

$clang -S -emit-llvm counter_i.c counter_test_check.c   

and try execute the code:

$lli-mp-3.5 counter_test_check.ll 

I receive this answer:

LLVM ERROR: Program used external function 'srunner_create' which could not be resolved!

I think that a solution is do something as:

$clang -S -emit-llvm counter_i.c counter_test_check.c   -lcheck

But it is not supported.

I am thinking that a similar answer is available at:LLVM JIT-compiled program cannot find external functions

Answer 1

はい、LLVM には C インターフェイスがあります (ただし、C++ API と比較していくつかの制限がある場合があります)。

http://llvm.org/docs/doxygen/html/group__LLVMC.html

Answer 2

私は解決策を見つけました：

clang -S -emit-llvm -c counter_test_check.c counter_i.c  
clang -o executable counter_test_check.ll counter_i.ll  -lcheck
./executable

コンパイルは 2 段階で行われるため、他の llvm ソース ファイルを使用できます。