quiet -Wmissing-prototypes warnings, and enable this warning by default for C with gcc.

helps for finding unused functions and making functions static, also did some minor code cleanup.

3 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/imbuf/intern/divers.c b/source/blender/imbuf/intern/divers.c
index 5ba08f1dd73..8acceb77b36 100644
--- a/source/blender/imbuf/intern/divers.c
+++ b/source/blender/imbuf/intern/divers.c
@@ -106,7 +106,7 @@ typedef struct DitherContext {
 	float f;
 } DitherContext;
 
-DitherContext *create_dither_context(int w, float factor)
+static DitherContext *create_dither_context(int w, float factor)
 {
 	DitherContext *di;
 	int i;
diff --git a/source/blender/imbuf/intern/indexer_dv.c b/source/blender/imbuf/intern/indexer_dv.c
index 6b960a18277..7a8f8fcc752 100644
--- a/source/blender/imbuf/intern/indexer_dv.c
+++ b/source/blender/imbuf/intern/indexer_dv.c
@@ -385,7 +385,7 @@ static void indexer_dv_delete(anim_index_builder *idx)
 	MEM_freeN(This);
 }
 
-void IMB_indexer_dv_new(anim_index_builder *idx)
+static void UNUSED_FUNCTION(IMB_indexer_dv_new)(anim_index_builder *idx)
 {
 	indexer_dv_context *rv = MEM_callocN(
 	        sizeof(indexer_dv_context), "index_dv builder context");
diff --git a/source/blender/imbuf/intern/util.c b/source/blender/imbuf/intern/util.c
index 6d1e3c16631..833671e3f2f 100644
--- a/source/blender/imbuf/intern/util.c
+++ b/source/blender/imbuf/intern/util.c
@@ -225,7 +225,7 @@ static int isqtime(const char *name)
 
 static char ffmpeg_last_error[1024];
 
-void ffmpeg_log_callback(void *ptr, int level, const char *format, va_list arg)
+static void ffmpeg_log_callback(void *ptr, int level, const char *format, va_list arg)
 {
 	if (ELEM(level, AV_LOG_FATAL, AV_LOG_ERROR)) {
 		size_t n = BLI_vsnprintf(ffmpeg_last_error, sizeof(ffmpeg_last_error), format, arg);