Hi, This is more or less a small change request. I can provide a patch as a starting point if it helps, but I'm not familiar with readline development so it's probably faster for someone else to do it.
In GDB, I'd like to pass a pointer to a string that should not be modified (the result of std::string::c_str) to readline's history_expand function. The input parameter to that function is currently a `char *`, but I don't think it needs to be. I was able to hack in the constness in binutils-gdb's internal readline tree, so I think it's possible to change the parameter to `const char *`. And I think it would be a nice change in general, to indicate to the caller that "I won't modify your string". Thanks, Simon
