[LLVMdev] CVS binutils includes support for plugins, can use the llvm plugin.

[Chris Lattner]

On May 26, 2009, at 10:52 AM, Rafael Espindola wrote:
> Today support for plugins has been committed to BFD. That is the file
> format abstraction library used by binutils. This now works

Very nice Rafael!  Can you please update the web page to mention this,  
e.g. in the LinkTimeOptimization.html document and wherever else  
relevant?

-Chris

>
> $ llvm-gcc -emit-llvm -O2 -c a.c
> $ llvm-gcc -emit-llvm -O2 -c b.c
> $ ar --plugin libLLVMgold.so q a.a a.o
> $ llvm-gcc -use-gold-plugin b.o a.a -o t
> $ objdump  -d t  | grep main\>: -A 2
> 0000000000400330 <main>:
>  400330:	31 c0                	xor    %eax,%eax
>  400332:	c3                   	retq
>
> with a.c being "int f(void) {  return 0;}" and b.c being "int f(void);
> int main(void) { return f(); }".
>
> BFD will also search for plugins in <prefix>/lib/bfd-plugins. You can
> just put libLLVMgold.so there and all you will need for LTO is to pass
> -use-gold-plugin while linking :-)
>
> Note that you must use the gold linker for -use-gold-plugin to  
> work :-)
>
> Cheers,
> -- 
> Rafael Avila de Espindola
>
> Google | Gordon House | Barrow Street | Dublin 4 | Ireland
> Registered in Dublin, Ireland | Registration Number: 368047
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