- fixed a few warnings pointed out by GCC.

src/maploader/renderinfo.cpp

@@ -828,7 +828,7 @@ void MapLoader::FixHoles()
 		segloops.Reserve(1);
 		auto *segloop = &segloops.Last();
 
-		seg_t *startseg;
+		seg_t *startseg = nullptr;
 		seg_t *checkseg;
 		while (bogussegs.Size() > 0)
 		{

src/maploader/specials.cpp

@@ -166,7 +166,7 @@ void MapLoader::SpawnLinePortal(line_t* line)
 				line->portalindex = Level->linePortals.Reserve(1);
 				FLinePortal *port = &Level->linePortals.Last();
 
-				memset(port, 0, sizeof(FLinePortal));
+				port->Clear();
 				port->mOrigin = line;
 				port->mDestination = &ln;
 				port->mType = PORTT_LINKED;
@@ -177,7 +177,7 @@ void MapLoader::SpawnLinePortal(line_t* line)
 				ln.portalindex = Level->linePortals.Reserve(1);
 				port = &Level->linePortals.Last();
 
-				memset(port, 0, sizeof(FLinePortal));
+				port->Clear();
 				port->mOrigin = &ln;
 				port->mDestination = line;
 				port->mType = PORTT_LINKED;

src/p_setup.cpp

@@ -245,11 +245,11 @@ void FLevelLocals::ClearPortals()
 	PortalBlockmap.Clear();
 
 	// The first entry must always be the default skybox. This is what every sector gets by default.
-	memset(&sectorPortals[0], 0, sizeof(sectorPortals[0]));
+	sectorPortals[0].Clear();
 	sectorPortals[0].mType = PORTS_SKYVIEWPOINT;
 	sectorPortals[0].mFlags = PORTSF_SKYFLATONLY;
 	// The second entry will be the default sky. This is for forcing a regular sky through the skybox picker
-	memset(&sectorPortals[1], 0, sizeof(sectorPortals[0]));
+	sectorPortals[1].Clear();
 	sectorPortals[1].mType = PORTS_SKYVIEWPOINT;
 	sectorPortals[1].mFlags = PORTSF_SKYFLATONLY;
 

src/playsim/p_map.cpp

@@ -2510,8 +2510,8 @@ bool P_TryMove(AActor *thing, const DVector2 &pos,
 	while (true)
 	{
 		double bestfrac = 1.1;
-		spechit_t besthit;
-		int besthitnum;
+		spechit_t besthit{};
+		int besthitnum = -1;
 		// find the portal nearest to the crossing actor
 		for (unsigned i = 0; i < portalhit.Size();i++)
 		{

src/playsim/portal.h

@@ -197,7 +197,12 @@ struct FLinePortal
 
 	FLinePortal()
 	{
-		memset(this, 0, sizeof *this);
+		Clear();
+	}
+
+	void Clear()
+	{
+		memset((void*)this, 0, sizeof * this);
 	}
 };
 
@@ -246,7 +251,12 @@ struct FSectorPortal
 
 	FSectorPortal()
 	{
-		memset(this, 0, sizeof * this);
+		Clear();
+	}
+
+	void Clear()
+	{
+		memset((void*)this, 0, sizeof * this);
 	}
 
 	bool MergeAllowed() const