phosek marked an inline comment as done. phosek added inline comments.
================ Comment at: clang/lib/Driver/ToolChains/Gnu.cpp:563 + crtend = Args.hasArg(options::OPT_shared) || IsPIE || IsStaticPIE ? + "crtend_shared" : "crtend"; + CmdArgs.push_back(ToolChain.getCompilerRTArgString( ---------------- MaskRay wrote: > phosek wrote: > > MaskRay wrote: > > > I believe `crtbegin.o` `crtend.o` should just work. It is not necessary > > > to use `crtbegin_shared.o` `crtend_shared.o`. > > This is related to your comments on D28791, specifically that we should be > > using `crtbegin_shared.o` for `-shared` or `-pie` and `crtbegin.o` > > otherwise, is that not the case? > Yes. I think we can rename `crtbegin_shared.o` to `crtbegin.o` and use it for > every configuration: `-no-pie` `-pie` `-shared` `-static` `-static -pie`. We've checked the glibc implementation of `__cxa_finalize`. A nonzero `__dso_handle` has to match the value passed to `__cxa_atexit` but a zero `__dso_handle` matches every function registered. So it matters that DSO fini calls use `&__dso_handle` to match their registrations for the `dlclose` case, but it also matters that the main executable fini call use zero to run all the dtors at exit time. It's not clear it really needs to be that way, but it would affect how the dtors get run which might affect some use cases. Hence, I don't think we can combine `crtbegin.o` and `crtbegin_shared.o`. Repository: rC Clang CHANGES SINCE LAST ACTION https://reviews.llvm.org/D59264/new/ https://reviews.llvm.org/D59264 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
