https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82501
--- Comment #18 from Andrey Drobyshev <a.drobyshev at samsung dot com> --- (In reply to Martin Liška from comment #16) > Created attachment 45797 [details] > Patch candidate > > Patch candidate where I made some refactoring and come up with tests. > Works fine on x86_64, on ppc64le there are some issues with > -fsection-anchors, but that would be possible to resolve. > > Please let me know if you're fine with that and we can submit that to > gcc-patches ML? Looks good to me. By not setting TREE_PUBLIC flag we give our dummy globals internal linkage (as if they were static), thus allowing linker to mix multiple TUs with these dummies. However, this way number of dummy globals in the resulting executable is proportional to the number of TUs, and each of them occupies additional 64b for redzone (due to alignment) + its poisoned metadata (struct __asan_global, also 64b on x86_64). I guess that's what was meant by "wasting more memory" in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82501#c1. I'm not sure, are we ok with such a waste?
