diff --git a/.travis.yml b/.travis.yml
index 01660248..f1996215 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -42,4 +42,4 @@ before_install:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then curl -O -L https://www.libsdl.org/projects/SDL_mixer/release/SDL2_mixer-2.0.1.dmg; hdiutil attach SDL2_mixer-2.0.1.dmg; sudo cp -a /Volumes/SDL2_mixer/SDL2_mixer.framework /Library/Frameworks/; fi
   - mkdir -p $HOME/srb2_cache
 
-script: make
+script: make -k
diff --git a/appveyor.yml b/appveyor.yml
index f9e7b3ba..fd949dbb 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -51,7 +51,7 @@ before_build:
 
 build_script:
 - cmd: mingw32-make.exe %SRB2_MFLAGS% %CONFIGURATION%=1 clean
-- cmd: mingw32-make.exe %SRB2_MFLAGS% %CONFIGURATION%=1 ERRORMODE=1
+- cmd: mingw32-make.exe %SRB2_MFLAGS% %CONFIGURATION%=1 ERRORMODE=1 -k
 
 after_build:
 - ccache -s
diff --git a/src/Makefile b/src/Makefile
index 463afccc..f43e3c24 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -372,7 +372,7 @@ else
 
 	# build a normal optimised version
 	WINDRESFLAGS = -DNDEBUG
-	#CFLAGS+=-O2
+	CFLAGS+=-O3
 endif
 	CFLAGS+=-g $(OPTS) $(M5) $(WINDRESFLAGS)
 
diff --git a/src/Makefile.cfg b/src/Makefile.cfg
index fa8896a7..347efa5e 100644
--- a/src/Makefile.cfg
+++ b/src/Makefile.cfg
@@ -173,6 +173,9 @@ endif
 ifdef GCC43
  #WFLAGS+=-Wno-error=clobbered
 endif
+ifdef GCC46
+ WFLAGS+=-Wno-error=suggest-attribute=noreturn
+endif
 WFLAGS+=$(OLDWFLAGS)
 
 
diff --git a/src/hardware/hw_main.c b/src/hardware/hw_main.c
index 5fb6a93f..bec9cdb1 100644
--- a/src/hardware/hw_main.c
+++ b/src/hardware/hw_main.c
@@ -3280,16 +3280,18 @@ static void HWR_AddPolyObjectPlanes(void)
 			if (po_ptrs[i]->translucency > 0)
 			{
 				FSurfaceInfo Surf;
-				FBITFIELD blendmode = HWR_TranstableToAlpha(po_ptrs[i]->translucency, &Surf);
+				FBITFIELD blendmode;
+				memset(&Surf, 0x00, sizeof(Surf));
+				blendmode = HWR_TranstableToAlpha(po_ptrs[i]->translucency, &Surf);
 				HWR_AddTransparentPolyobjectFloor(levelflats[polyobjsector->ceilingpic].lumpnum, po_ptrs[i], polyobjsector->ceilingheight,
-													polyobjsector->lightlevel, Surf.FlatColor.s.alpha, polyobjsector, blendmode, NULL);
+				                                  polyobjsector->lightlevel, Surf.FlatColor.s.alpha, polyobjsector, blendmode, NULL);
 			}
 			else
 			{
 				HWR_GetFlat(levelflats[polyobjsector->ceilingpic].lumpnum);
 				HWR_RenderPolyObjectPlane(po_ptrs[i], polyobjsector->ceilingheight, PF_Occlude,
-										polyobjsector->lightlevel, levelflats[polyobjsector->floorpic].lumpnum,
-										polyobjsector, 255, NULL);
+				                          polyobjsector->lightlevel, levelflats[polyobjsector->floorpic].lumpnum,
+				                          polyobjsector, 255, NULL);
 			}
 		}
 	}
diff --git a/src/hardware/hw_md2.c b/src/hardware/hw_md2.c
index 31a510d8..8e48ec11 100644
--- a/src/hardware/hw_md2.c
+++ b/src/hardware/hw_md2.c
@@ -1387,10 +1387,7 @@ void HWR_DrawMD2(gr_vissprite_t *spr)
 		// SRB2CBTODO: MD2 scaling support
 		finalscale *= FIXED_TO_FLOAT(spr->mobj->scale);
 
-		if (postimgtype == postimg_flip)
-			p.flip = true;
-		else
-			p.flip = false;
+		p.flip = atransform.flip;
 
 		HWD.pfnDrawMD2i(buff, curr, durs, tics, next, &p, finalscale, flip, color);
 	}
diff --git a/src/p_saveg.c b/src/p_saveg.c
index 975232ba..5e457ca3 100644
--- a/src/p_saveg.c
+++ b/src/p_saveg.c
@@ -108,7 +108,7 @@ static inline void P_UnArchivePlayer(void)
 //
 // P_NetArchivePlayers
 //
-static inline void P_NetArchivePlayers(void)
+static void P_NetArchivePlayers(void)
 {
 	INT32 i, j;
 	UINT16 flags;
@@ -280,7 +280,7 @@ static inline void P_NetArchivePlayers(void)
 //
 // P_NetUnArchivePlayers
 //
-static inline void P_NetUnArchivePlayers(void)
+static void P_NetUnArchivePlayers(void)
 {
 	INT32 i, j;
 	UINT16 flags;