> On 21 Jun 2019, at 11:28, Jonathan Wakely <jwakely....@gmail.com> wrote: > > On Fri, 21 Jun 2019 at 11:22, Martin Liška <mli...@suse.cz> wrote: >> >> On 6/20/19 9:53 PM, Richard Biener wrote: >>> On June 20, 2019 5:09:55 PM GMT+02:00, "Martin Liška" <mli...@suse.cz> >>> wrote: >>>> On 6/20/19 4:21 PM, David Edelsohn wrote: >>>>> On Thu, Jun 20, 2019 at 10:05 AM Martin Liška <mli...@suse.cz> wrote: >>>>>> >>>>>> Hi. >>>>>> >>>>>> In order to not buffer stderr output in LTO mode, I would like to >>>> remove >>>>>> support for repo files (tlink). If I'm correctly it's only used by >>>> AIX >>>>>> target. Would it be possible to drop that for the future? Is it even >>>>>> used? >>>>> >>>>> AIX currently does not support GCC LTO, but the hope was that GCC >>>>> would not do anything to specifically inhibit that ability to >>>>> eventually support that feature. AIX currently needs collect2. I >>>>> guess that AIX could try to find another mechanism when it adds >>>>> support. >>>> >>>> Yes, I'm fine with collect2. I'm more precisely asking about >>>> read_report_files >>>> that lives in tlink.c. If I understand correctly, it's parsing output >>>> of linker >>>> and tries to find template implementations in a .rpo files that live on >>>> a disk. >>>> That's a legacy functionality that I'm targeting to remove. >>> >>> IIRC -frepo also works on Linux? >> >> Heh, you are right ;). Is there are consumer of that infrastructure >> or can we just drop it? > > Anybody using option 2 at > https://gcc.gnu.org/onlinedocs/gcc/Template-Instantiation.html > > I have no idea if anybody is using that, but we should at least > deprecate it instead of just dropping a documented option without > warning.
I should have been clearer about Darwin: collect2 is required because it wraps the calling of lto-wrapper and ld. FWIW Darwin also passes all the “-frepo” testcases, however, I’m not aware of anyone actually using case #2 from Jonathan’s post. So, AFAIK the tlink capability isn’t required for modern C++ on Darwin; but, maybe deprecation is a safer step. Iain
