m_config: deprecate top-level suboptions

This is a really old weird MPlayer feature. While the MPlayer requires
you to use the sub-option syntax in these cases, mpv "flattens" them to
normal options. The still-supported alternate sub-option syntax remains
a weird artifact that hopefully nobody uses.

For example you can do "-sub-text font=Foo:color=0.5" instead of using
"--sub-text-font=Foo --sub-text-color=0.5". For --sub-text this is an
accidental feature, but it used to be documented for
--demuxer-rawaudio and some others.

This should just be removed, but for now only print a warning to preempt
complaints from weird users wanting this feature back.

1 files changed, 2 insertions, 0 deletions

diff --git a/options/m_config.h b/options/m_config.h
index af8ab421f0..0d8b7961d0 100644
--- a/options/m_config.h
+++ b/options/m_config.h
@@ -77,6 +77,8 @@ typedef struct m_config {
     // For the command line parser
     int recursion_depth;
 
+    bool subopt_deprecation_warning;
+
     void *optstruct; // struct mpopts or other
 } m_config_t;