[Qemu-devel] [PATCH] configure: Let SDL support be optional on OpenBSD

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

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.

This does not change the default behavior:

  $ ./configure --cc=x86_64-unknown-openbsd6.1-gcc-4.9.4 --python=python2.7
  SDL support       yes (1.2.15)

  WARNING: Use of SDL 1.2 is deprecated and will be removed in
  WARNING: future releases. Please switch to using SDL 2.0

  GEN     config-host.h
  ...

but allows to build without SDL:

  $ ./configure --cc=x86_64-unknown-openbsd6.1-gcc-4.9.4 --python=python2.7 --disable-sdl
  SDL support       no
  GEN     config-host.h
  ...

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
See https://lists.gnu.org/archive/html/qemu-devel/2019-01/msg02732.html

 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index de768e2343..98fc4fa84a 100755
--- 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"
-- 
2.20.1