Comment # 4 on bug 139 from Johannes Pfau

Timo Sintonen noted that this is actually contra-productive at least on
embedded systems. .bss is read-write storage whereas .rodata can be in readonly
storage.
http://forum.dlang.org/post/nadodelkzuwtrnquoove@forum.dlang.org

I wonder whether the reason you don't see a difference in phobos is a string
pooling optimization: I'd expect a clever linker to combine all .zero blocks in
.rodata into one block with the size of the largest single block, then use
'slices' to that block.