On 05/23/2018 02:55 PM, Michael Matz wrote:
On Fri, 18 May 2018, Richard Biener wrote:
Interesting. Do they allow merging across such sections? Consider a 8
byte entity 0x12345678 and 4 byte entities 0x1234 0x5678, will the 4
byte entities share the rodata with the 8 byte one?
There's no language to forbid this (as long as the alignments
are respected), but at least GNU ld currently only merges same-sized
entities.
I'm not entirely sure if this is valid for C, particularly if the
objects have the same address, but not the same type.
There is a discussion on the generic-abi list about providing
information to the linker about when it is safe to do such merging:
https://groups.google.com/forum/#!topic/generic-abi/MPr8TVtnVn4
Thanks,
Florian
