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Re: [Qemu-devel] [PATCH] configure: Let SDL support be optional on OpenB
From: |
Daniel P . Berrangé |
Subject: |
Re: [Qemu-devel] [PATCH] configure: Let SDL support be optional on OpenBSD |
Date: |
Wed, 23 Jan 2019 09:33:54 +0000 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
On Tue, Jan 22, 2019 at 07:20:35PM +0000, Peter Maydell wrote:
> On Tue, 22 Jan 2019 at 19:05, Philippe Mathieu-Daudé <address@hidden> wrote:
> >
> > Currently if we try to build QEMU on OpenBSD with SDL disabled, we get:
> >
> > $ ./configure --cc=x86_64-unknown-openbsd6.1-gcc-4.9.4 --python=python2.7
> > --disable-sdl
> >
> > ERROR: sdl not found or disabled, can not use sdl audio driver
> >
> > Since SDL is not a requirement for OpenBSD, let it be optional (we remove
> > it from $audio_drv_list but it stays available in $audio_possible_drivers).
> > If no audio backends are available, QEMU falls back to the null driver.
>
> > --- a/configure
> > +++ b/configure
> > @@ -828,7 +828,7 @@ NetBSD)
> > OpenBSD)
> > bsd="yes"
> > make="${MAKE-gmake}"
> > - audio_drv_list="sdl"
> > + audio_drv_list=""
> > audio_possible_drivers="sdl"
> > HOST_VARIANT_DIR="openbsd"
> > supported_os="yes"
>
> This will mean that configure will by default not enable
> a real audio backend, even if we do have sdl.
>
> Looking at the logic, "audio_possible_drivers" is only
> used for printing the help message. The thing that drives
> which audio drivers to test with is "audio_drv_list",
> and the expectation is that you put things on that only
> if it's possible to build with them. (For instance
> we only add 'dsound' for mingw if the dsound.h header is
> present, and so on.)
>
> So we need to do one of:
> (1) only put "sdl" into audio_drv_list if SDL is
> available (this probably doesn't work as we haven't
> probed for SDL at the point where we initialize it)
> (2) have the sdl probe delete "sdl" from audio_drv_list
> if the probe fails
This one sounds reasonable to me.
> (3) some more complicated restructuring :-)
> (eg rather than having audio_drv_list be set to an
> initial list based on the host OS, just have a full
> list of drivers, insist that each has a proper probe
> routine, and use whichever ones we can successfully
> probe)
Regards,
Daniel
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