[LLVMdev] How to compile object C with clang into llvm IR?

Jonathan gamma_chen at yahoo.com.tw
Fri Apr 5 20:19:27 PDT 2013


I got the following compile error. Did the message-arrays.m can be compiled into .bc? Or need include something for Object C language compile.

Jonathan

118-165-76-229:CodeGenObjC Jonathan$ pwd
/Users/Jonathan/llvm/release/src/tools/clang/test/CodeGenObjC
118-165-76-229:CodeGenObjC Jonathan$ clang -emit-llvm -o 1.ll -c message-arrays.m 
message-arrays.m:5:3: warning: instance method '-print:' not found (return type
      defaults to 'id') [-Wobjc-method-access]
  [ a print: "hello" ];
  ^   ~~~~~
message-arrays.m:15:1: warning: control reaches end of non-void function
      [-Wreturn-type]
}
^
2 warnings generated.
118-165-76-229:CodeGenObjC Jonathan$ clang -emit-llvm -o 1.ll -c ivars.m
ivars.m:18:12: warning: class 'R' defined without specifying a base class
      [-Wobjc-root-class]
@interface R {
           ^
ivars.m:18:13: note: add a super class to fix this problem
@interface R {
            ^
1 warning generated.

On 2013/4/6, at 上午11:05, Tyler Hardin <tghardin1 at catamount.wcu.edu> wrote:

> Look up --emit-llvm. I think it has to be used with -c.
> 
> On Apr 5, 2013 10:55 PM, "Jonathan" <gamma_chen at yahoo.com.tw> wrote:
> Following came from tools/clang/test/CodeGenObjC/message-arrays.m. But I don't know how to compile it at terminal command since no clang_cc1 executable file. Can some one help me? I am writing the llvm backend document --http://jonathan2251.github.com/lbd/index.html now. I use "clang -c hello.cpp -emit-llvm" to compile C++ but don't know how to compile Object-C.
> 
> // RUN: %clang_cc1 -emit-llvm -o %t %s
> 
> void f0(id a) {
>  // This should have an implicit cast
>  [ a print: "hello" ];
> }
> 
> @interface A
> -(void) m: (int) arg0, ...;
> @end
> 
> int f1(A *a) {
>  // This should also get an implicit cast (for the vararg)
>  [a m: 1, "test"];
> }
> 
> Jonathan
> 
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