https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82501
--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #1) > As discussed on IRC, with current libasan __asan_register_globals, we have 2 > options: > 1) add an object that we link early with -fsanitize=address that contains > zero sized variables with following redzone registered with > __asan_register_globals in .rodata, .data and .bss sections (similarly to > how libasan_preinit.o is added to non- -shared links, this would be > something added to every link) > 2) in each TU emit such zero sized variable with following redzone and > register it before the first variable in .data, .rodata and/or .bss if any > vars are emitted there > > 1) has the advantage that it wastes less memory in red zones (especially > with many TUs), but will work well only if not mixing TUs with > -fsanitize=address and without > 2) wastes more memory and is more costly also because registering more > globals, but will work better when mixing TUs with -fsanitize=address and > without Jakub on IRC: if we go with the single *.o file with registered dummies at start of each section, it would need to include .sdata and .sbss vars too on powerpc
