ipa on all files together

[Hongtao]

 On 11/01/10 20:35, Diego Novillo wrote:
> On Mon, Nov 1, 2010 at 19:57, Hongtao <yu171@purdue.edu> wrote:
>>  Hi All,
>>
>> While using gcc-4.6 with option -flto, I found that interprocedural
>> analysis were performed on each source file separately. For example for
>> the pass pass_ipa_pta, if we compile two files like :
>>         gcc -O -flto f1.c f2.c
>> we have the pass run twice, one for each source file. So is there a way
>> that can perform IPA on all source files together?
> With -combine you used to be able to do this, but it has been removed
> in favour of -flto (actually, I'm not quite sure whether it's been
> removed already, but it's on the chopping block).
>
> With -flto, IPA will be performed on all the files together, as well
> as each file separately.  In your example, IPA runs 3 times.  Once for
> each f1.c and f2.c, and a third time with both f1.o and f2.o as a
> single translation unit. 
  Thanks. But can I only keep the third pass, i.e.  I want to perform a
pass only on all units together without on each unit separately?

  Hongtao

> Diego.
>