CMake: Use GCC7's -Wimplicit-fallthrough=5

Use to avoid accidental missing break statements,
use ATTR_FALLTHROUGH to suppress.

2 files changed, 6 insertions, 2 deletions

diff --git a/source/blender/render/intern/source/render_texture.c b/source/blender/render/intern/source/render_texture.c
index 42e4d4f27f6..22dc2b28900 100644
--- a/source/blender/render/intern/source/render_texture.c
+++ b/source/blender/render/intern/source/render_texture.c
@@ -1495,6 +1495,7 @@ void texture_rgb_blend(float in[3], const float tex[3], const float out[3], floa
 		
 	case MTEX_SUB:
 		fact= -fact;
+		ATTR_FALLTHROUGH;
 	case MTEX_ADD:
 		fact*= facg;
 		in[0]= (fact*tex[0] + out[0]);
@@ -1609,6 +1610,7 @@ float texture_value_blend(float tex, float out, float fact, float facg, int blen
 
 	case MTEX_SUB:
 		fact= -fact;
+		ATTR_FALLTHROUGH;
 	case MTEX_ADD:
 		in= fact*tex + out;
 		break;
diff --git a/source/blender/render/intern/source/volumetric.c b/source/blender/render/intern/source/volumetric.c
index 610e86caa13..7fe52328781 100644
--- a/source/blender/render/intern/source/volumetric.c
+++ b/source/blender/render/intern/source/volumetric.c
@@ -275,10 +275,12 @@ static float metadensity(Object *ob, const float co[3])
 				break;
 			case MB_CUBE:
 				tp[2] = (tp[2] > ml->expz) ? (tp[2] - ml->expz) : ((tp[2] < -ml->expz) ? (tp[2] + ml->expz) : 0.f);
-			/* no break, xy as plane */
+				/* no break, xy as plane */
+				ATTR_FALLTHROUGH;
 			case MB_PLANE:
 				tp[1] = (tp[1] > ml->expy) ? (tp[1] - ml->expy) : ((tp[1] < -ml->expy) ? (tp[1] + ml->expy) : 0.f);
-			/* no break, x as tube */
+				/* no break, x as tube */
+				ATTR_FALLTHROUGH;
 			case MB_TUBE:
 				tp[0] = (tp[0] > ml->expx) ? (tp[0] - ml->expx) : ((tp[0] < -ml->expx) ? (tp[0] + ml->expx) : 0.f);
 		}