http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46749
--- Comment #34 from rguenther at suse dot de <rguenther at suse dot de> 2010-12-04 10:27:58 UTC --- On Sat, 4 Dec 2010, mikestump at comcast dot net wrote: > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46749 > > --- Comment #31 from Mike Stump <mikestump at comcast dot net> 2010-12-04 > 00:18:07 UTC --- > On Dec 3, 2010, at 3:20 PM, rguenther at suse dot de wrote: > > yes, I would have expected that this happens already. Now, I (or > > somebody else) needs to take the time and investigate why this > > doesn't happen. > > Ah, I can explain it, collect2 does `stuff', and what it does is to remove the > lto temporary files, early. The below are the files that are too early, and > will `fix' the issue. > > Index: collect2.c > =================================================================== > --- collect2.c (revision 167409) > +++ collect2.c (working copy) > @@ -1056,7 +1056,9 @@ > fork_execute ("ld", out_lto_ld_argv); > free (lto_ld_argv); > > +#if 0 > maybe_unlink_list (lto_o_files); > +#endif > } > else if (force) > { > > If collect2 was folded into gcc.c and all the lto stuff was flat, inside gcc.c > and then we let record_temp_file register _all_ the temporary files, and the > let gcc.c delete the temporary files at the end, all work work just fine. Well - yes. There is the complication called linker-plugin (which is also removing the files). You can't fold the linker plugin (thus, the linker) into the gcc driver. I thought a long time on what a solution to the problem could be and only see the following: - The GCC driver is the place where we can detect if we need to execute dsymutil because we'll only have temporary object files. The GCC driver needs to arrange for a new -dsym option being passed to the linker (which might be collect2 for example) - The _linker_ (or collect2 for example) is responsible for invoking dsymutil if there is a -dsym option on the command-line. Only at link time we are sure all object files are still around. If darwin only ever uses collect2 (and not the linker-plugin) then this would be a easy and localized change. It would of course also offer the user to specify that he wants dsymutil to run. Richard.
