[Lldb-commits] [lldb] r303907 - Fix bug #28898

Pavel Labath via lldb-commits lldb-commits at lists.llvm.org
Thu May 31 02:31:21 PDT 2018

I hate to resurrect an old thread, but there has been a new spurt of
this discussion about this patch here

I think I have an idea on how to improve things slightly for us here,
but as I know very little about this issue, I'd like someone to take a
look at this first.

Christos, can you check whether my proposal makes sense to you? I am
including it in this email for your convenience:

I've re-read the last years discussions, and I think I have an idea on
how to improve the situation here somewhat. The way I understand it,
we have three scenarios to worry about:

1. old-libedit --enable-widec
  - el_gets -> narrow_read_function
  - el_wgets -> wide_read_function
2. new-libedit --enable-widec
  - el_gets -> wide_read_function
  - el_wgets -> wide_read_function
3. libedit --disable-widec
  - I don't actually know what happens here but my proposal does not
change our behavior in this case.

As I understand it, the problem is that we are not able to distinguish
between (1) and (2) and build time, so we have to just pick one and
hope it works. This means we work correctly for (1), we fail for (2)
and something unknown happens for (3).

However, we **are** able to distinguish between (1+2) and (3) at build
time (just search for `el_wgets` symbol). And, if I understand it
correctly, when we use el_wgets and friends we are always correct, no
matter the libedit version. This would mean are always correct for
both (1) **and** (2), while the situation remains unchanged for (3).
This should be a strict improvement over status quo.

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