Build error: undefined reference to `snd_soc_unregister_codec'

Build error: undefined reference to `snd_soc_unregister_codec'

[Russell King - ARM Linux]

When building ALSA as modules:

drivers/built-in.o: In function `omapdss_hdmihw_remove':
omap_hwspinlock.c:(.text+0x23da8): undefined reference to `snd_soc_unregister_codec'
drivers/built-in.o: In function `omapdss_hdmihw_probe':
omap_hwspinlock.c:(.text+0x24248): undefined reference to `snd_soc_register_codec'

(the filename is inaccurate).

This happens because drivers/video/omap2/dss/hdmi.c is built-in and uses
ASoC services, but ASoC and ALSA are modular.

Re: Build error: undefined reference to `snd_soc_unregister_codec'

[Ricardo Neri]

Hi Rusell,

On 04/27/2012 08:28 AM, Russell King - ARM Linux wrote:
> When building ALSA as modules:
>
> drivers/built-in.o: In function `omapdss_hdmihw_remove':
> omap_hwspinlock.c:(.text+0x23da8): undefined reference to `snd_soc_unregister_codec'
> drivers/built-in.o: In function `omapdss_hdmihw_probe':
> omap_hwspinlock.c:(.text+0x24248): undefined reference to `snd_soc_register_codec'
>
> (the filename is inaccurate).
>
> This happens because drivers/video/omap2/dss/hdmi.c is built-in and uses
> ASoC services, but ASoC and ALSA are modular.

As you mention, this happens because the ASoC HDMI codec is embeeded in 
the DSS driver. There is a set of patches currently under discussion to 
decouple the ASoC HDMI codec from DSS[1]. This will fix the issue.

BR,
[1]http://www.spinics.net/lists/linux-omap/msg67307.html

Ricardo
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