[openal] OpenAL fails with OSS on FreeBSD

[Chris Robinson]

On 12/01/2016 05:34 PM, Yuri wrote:
> It wasn't optimized when I debugged it. It definitely changes the value
> outside its range.

libc looks like it's optimized, which is where memset is and you say a 
string is being changed. There's certainly something fishy going on. If 
"OSS Default" is being changed, I wouldn't expect the

[06:00:45.404 UTC] src/audio/audio.cpp:396 : Warning: Cannot open output 
audio device "OSS Default"

line to look like it does, as the device name string is clearly intact 
after the alcOpenDevice call. Unless alcOpenDevice gets a different copy 
of the string. If the pointer itself is getting changed by memset 
(meaning it's overwriting the stack, and somehow doesn't crash), it 
would be overwritten with 0s, likely NULL, which should result in an 
(EE) message that it can't open /dev/dsp.

What happens if you call alcOpenDevice(NULL) instead of passing in a 
device name?