[smeenai]

LLD (the new linker from the LLVM project) actually does exactly this; by default, it creates a separate read-only segment, and you have to pass --no-rosegment explicitly if you don't want this.

Amusingly enough, I ran into some issues because of this; e.g. valgrind's symbolication was failing on LLD-linked binaries unless I used --no-rosegment. I didn't dig into it too much, but it's probably making some bad assumptions about the text section's load address. (LLD places the read-executable segment after the read-only segment, and I think valgrind was assuming that the text section would be part of the first segment.)