[PATCH 20/24] Allow TUI windows in Python

[Simon Marchi]

On 2020-03-11 12:47 a.m., Simon Marchi wrote:
> Sorry for being terse earlier, I didn't have much time.  I took another look,
> I built the file with -save-temps and inspected the .ii file.  The
> HAVE_NCURSES_H comes from pyconfig.h, which comes from the Python installation.
> 
> For example, on my Ubuntu here, it's at:
> 
>   /usr/include/x86_64-linux-gnu/python3.8/pyconfig.h
> 
> This file tells us Python was built with ncurses, which doesn't mean the
> ncurses development headers are installed and available to GDB.  I find it
> very odd that Python exposes these very generically-named macros in the global
> namespace.  Almost any of these HAVE_FOO macros from Python could clash with
> our own macros.
> 
> Anyway, I was able to reproduce it starting from a scratch Ubuntu 20.04 docker
> container, installing everything required to build GDB except the ncurses
> development headers.
> 
> One way to fix it is to make sure "python-internal.h" is included after
> "gdb_curses.h", in py-tui.c.

Or, maybe we can say that this falls in the "mis-configuration" bucket.

If we are building against a Python that claims to have been built with
ncurses.h present, then ncurses.h ought to be present.  Then the fix is
for the user to install the ncurses development package.

Simon