Add checks for HAVE_GPL to various GPL-only source files

This should actually cover all of them, if you take into account that
some unchanged GPL source files include header files with such checks.
Also this was done already for the libaf derived code.

This is only for "safety" and to avoid misunderstandings.

3 files changed, 12 insertions, 0 deletions

diff --git a/audio/out/ao_alsa.c b/audio/out/ao_alsa.c
index 900cbafd03..050aef4e2c 100644
--- a/audio/out/ao_alsa.c
+++ b/audio/out/ao_alsa.c
@@ -49,6 +49,10 @@
 #include "internal.h"
 #include "audio/format.h"
 
+#if !HAVE_GPL
+#error GPL only
+#endif
+
 struct ao_alsa_opts {
     char *mixer_device;
     char *mixer_name;
diff --git a/audio/out/ao_jack.c b/audio/out/ao_jack.c
index 597835c989..b5413f77cf 100644
--- a/audio/out/ao_jack.c
+++ b/audio/out/ao_jack.c
@@ -40,6 +40,10 @@
 
 #include <jack/jack.h>
 
+#if !HAVE_GPL
+#error GPL only
+#endif
+
 struct jack_opts {
     char *port;
     char *client_name;
diff --git a/audio/out/ao_oss.c b/audio/out/ao_oss.c
index eebd9622e7..72413cd9f8 100644
--- a/audio/out/ao_oss.c
+++ b/audio/out/ao_oss.c
@@ -49,6 +49,10 @@
 #include "ao.h"
 #include "internal.h"
 
+#if !HAVE_GPL
+#error GPL only
+#endif
+
 // Define to 0 if the device must be reopened to reset it (stop all playback,
 // clear the buffer), and the device should be closed when unused.
 // Define to 1 if SNDCTL_DSP_RESET should be used to reset without close.