[LLVMdev] how to output the single bitcode file using gold plugin?

[Nick Lewycky]

xiaoming gu wrote:
> Hi, all. I want to get the single bitcode file after link-time
> optimizations. After doing some searching, I get commands as follows:
>
> /llvm-gcc -O4 -c xxx.c -o xxx.o
> llvm-gcc xxx.o -use-gold-plugin -Wl,-debug
> -Wl,-plugin-opt=also-emit-llvm -lm -o xxx/
>
> But these command don't give me the wanted bitcode file. The used
> version of llvm is 2.7.

If you just want to produce a bitcode file, I'd use:

   llvm-gcc -O4 -c xxx1.c -o xxx1.bc
   llvm-link xxx1.bc xxx2.bc ... -o yyy.bc
   opt -std-link-opts yyy.bc -o zzz.bc

and avoid gold altogether.

> Do you have any idea of this problem or any other solution to get the
> bitcode file with gold plugin? Thanks.

I don't think the -also-emit-llvm flag was implemented in the gold 
plugin as of the 2.7 release, so no.

Nick