On 05/02/2018 17:34, Dylan Baker wrote:
Quoting Jon Turney (2018-02-03 13:19:20)
On 03/02/2018 18:07, Dylan Baker wrote:
Quoting Jon Turney (2018-02-03 05:49:40)
-  if not ['darwin', 'windows'].contains(host_machine.system())
+  if not ['darwin', 'windows', 'cygwin'].contains(host_machine.system())
+    # TODO: PPC, Sparc
       if ['x86', 'x86_64'].contains(host_machine.cpu_family())
         _drivers = 'i915,i965,r100,r200,nouveau'
       else
         error('Unknown architecture. Please pass -Ddri-drivers to set driver 
options. Patches gladly accepted to fix this.')
       endif
     else
-    error('Unknown OS. Please pass -Ddri-drivers to set driver options. 
Patches gladly accepted to fix this.')
+    # only swrast would make sense here, but gallium swrast is a much better 
default
+    _drivers = ''

I'm really not a fan of dumping the 'else error' case. This currently means that
for example haiku will try to build something that they cannot support. I'd
really rather just set appropriate defaults for OSes that are guaranteed
supported and still let OSes that haven't been tested fall through to error. I
also think that's a nice place for people trying to use mesa meson on a new
platform, since they understand we haven't tested on their OS.

Good idea.  But that's not what the code currently does.  If it's not on
the list of 'unknown' OSes (darwin, windows), any other OS e.g. haiku
gets treated like linux...

Attached is a revised patch which is more explicit about what's a known
OS.  I guess the BSDs probably should be added somewhere, but idk what's
appropriate for them.

I rather like this patch, so you can add:
Reviewed-by: Dylan Baker <dy...@pnwbakers.com>

Thanks.

The only thing I might do differently is instead of checking for Linux use the
`system_has_kms_drm` variable (which covers the BSDs as well as Linux, but I'm
okay with landing this as-is and changing that later if that is the right thing
to do.

Yeah, that seems pretty plausible.
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