Re: Building in Solaris 11.4

[Peter Maydell]

On Sat, 27 Jun 2020 at 23:05, Michele Denber <denber@mindspring.com> wrote:
>
> Well I removed the "static" from the line
>
> static int openpty(int *amaster, int *aslave, char *name,
>                    struct termios *termp, struct winsize *winp)
>
> in util/qemu-openpty.c.  I odn't know if that was the right thing to do but 
> it did allow it to compile.

No, that doesn't sound right. The code in qemu-openpty.c
for Solaris assumes that solaris does not provide
openpty(), and so it provides its own implementation.
This is a very old bit of portability-workaround. It
sounds like at least some Solaris versions do provide
a system openpty() in termios.h (in libc, or perhaps
needing an extra -lsomething?), in which case we want
to detect that and use it (not compiling the QEMU
code for solaris-without-openpty).

The first thing to do here would be to find out which
versions of Solaris provide openpty(), and which header
and library need to be used to compile code that uses it.
The gnulib docs think it is missing on Solaris 11.3:
do we care about supporting that as a host OS?
https://www.gnu.org/software/gnulib/manual/html_node/openpty.html

Then you'd need to improve configure so that it looked for
"does the system provide openpty() via termios.h" and defined
CONFIG_OPENPTY_IN_TERMIOS to indicate that; then if that is
set we qemu-openpty.c can make solaris use the "system has
openpty()" codepath rather than "system doesn't have that".
If it turns out that all Solaris versions new enough that we
might care about them do have openpty() we could also delete
the handling code for systems that don't.

> CC      monitor/trace.o
> util/drm.c: In function 'qemu_drm_rendernode_open':
> util/drm.c:41:16: error: 'struct dirent' has no member named 'd_type'; did 
> you mean 'd_name'?
>          if (e->d_type != DT_CHR) {
>                 ^~~~~~
>                 d_name
> util/drm.c:41:26: error: 'DT_CHR' undeclared (first use in this function); 
> did you mean 'TH_CWR'?
>          if (e->d_type != DT_CHR) {
>                           ^~~~~~
>                           TH_CWR
> util/drm.c:41:26: note: each undeclared identifier is reported only once for 
> each function it appears in
> gmake: *** [/export/home/denber/qemu-5.0.0/rules.mak:69: util/drm.o] Error 1
>
> This looks like more "not in Solaris" POSIX stuff.

Ah, the Haiku folks just ran into exactly this issue.
Their fix should also be good for Solaris:
https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg08800.html
(This whole file is for using a Linux-specific feature so there's
no point even compiling it for other OSes.)

thanks
-- PMM