http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58270
--- Comment #8 from Krzysztof Strasburger <strasbur at chkw386 dot ch.pwr.wroc.pl> --- Mikael, I cannot agree. Do not look at main.c, as the compiler doesn't know anything about it while compiling buggy.c (this is the reason for which I keep main() separately) and doesn't know that i1, i2 and i3 may be set to something > 0 at runtime. If it would be so much strict about declarations, it wouldn't also allow to modify mem.dmem[1] - everything would go into mem.dmem[0]. However, it writes mem.dmem[1] only (!) if compiled without -fno-tree-dse and mem.dmem[0] plus mem.dmem[1] with -fno-tree-dse. The problem is that the compiler does not work predictably. BTW, correct size of the mem structure (global variable) is ensured by the linker: $ nm buggy.o 00000000 T buggy 0000000c C loc 00000008 C mem I would also expect that if the compiler is instructed explicitly to release some constraints, then these will be released.
