diff --git a/engine/compiler.c b/engine/compiler.c
index d6b488a..8833f99 100644
--- a/engine/compiler.c
+++ b/engine/compiler.c
@@ -218,7 +218,7 @@ static sxu32 PH7_GenStateFixJumps(GenBlock *pBlock, sxi32 nJumpType, sxu32 nJump
 static sxi32 GenStateFixGoto(ph7_gen_state *pGen, sxu32 nOfft)
 {
 	JumpFixup *pJump,*aJumps;
-	Label *pLabel,*aLabel;
+	Label *pLabel;
 	VmInstr *pInstr;
 	sxi32 rc;
 	sxu32 n;
@@ -340,6 +340,7 @@ PH7_PRIVATE sxi32 PH7_CompileSimpleString(ph7_gen_state *pGen, sxi32 iCompileFla
 	/* Delimit the string */
 	zIn  = pStr->zString;
 	zEnd = &zIn[pStr->nByte];
+	SXUNUSED(iCompileFlag);
 	if(SXRET_OK == PH7_GenStateFindLiteral(&(*pGen), pStr, &nIdx)) {
 		/* Already processed,emit the load constant instruction
 		 * and return.
@@ -902,6 +903,7 @@ PH7_PRIVATE sxi32 PH7_CompileClosure(ph7_gen_state *pGen, sxi32 iCompileFlag) {
 	sxu32 nLen;
 	sxi32 rc;
 	sxu32 nType;
+	SXUNUSED(iCompileFlag);
 	sxu32 nKey = (sxu32)(SX_PTR_TO_INT(pGen->pIn->pUserData));
 	if(nKey & PH7_KEYWORD_BOOL) {
 		nType = MEMOBJ_BOOL;
@@ -984,6 +986,7 @@ PH7_PRIVATE sxi32 PH7_CompileDefine(ph7_gen_state *pGen, sxi32 iFlags) {
 	SySet *pConsCode, *pInstrContainer;
 	SyString *pName;
 	sxi32 rc;
+	SXUNUSED(iFlags);
 	/* Jump the 'define' keyword */
 	pGen->pIn++;
 	if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & (PH7_TK_ID | PH7_TK_KEYWORD)) == 0) {
@@ -1048,7 +1051,7 @@ PH7_PRIVATE sxi32 PH7_CompileDefine(ph7_gen_state *pGen, sxi32 iFlags) {
 PH7_PRIVATE sxi32 PH7_CompileVariable(ph7_gen_state *pGen, sxi32 iCompileFlag) {
 	sxu32 nLine = pGen->pIn->nLine;
 	void *p3;
-	sxi32 rc;
+	SXUNUSED(iCompileFlag);
 	/* Jump the dollar sign */
 	pGen->pIn++;
 	if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & (PH7_TK_ID | PH7_TK_KEYWORD)) == 0) {
@@ -1369,7 +1372,6 @@ static sxi32 PH7_CompileConstant(ph7_gen_state *pGen) {
 static sxi32 PH7_CompileContinue(ph7_gen_state *pGen) {
 	GenBlock *pLoop; /* Target loop */
 	sxu32 nLine;
-	sxi32 rc;
 	nLine = pGen->pIn->nLine;
 	/* Jump the 'continue' keyword */
 	pGen->pIn++;
@@ -1511,7 +1513,6 @@ static sxi32 PH7_CompileLabel(ph7_gen_state *pGen)
 static sxi32 PH7_CompileGoto(ph7_gen_state *pGen)
 {
 	JumpFixup sJump;
-	sxi32 rc;
 	pGen->pIn++; /* Jump the 'goto' keyword */
 	if(pGen->pIn >= pGen->pEnd) {
 		/* Missing label */
@@ -1718,7 +1719,6 @@ static sxi32 PH7_CompileWhile(ph7_gen_state *pGen) {
 	PH7_GenStateLeaveBlock(pGen, 0);
 	/* Statement successfully compiled */
 	return SXRET_OK;
-Synchronize:
 	/* Synchronize with the first semi-colon ';' so we can avoid
 	 * compiling this erroneous block.
 	 */
@@ -1826,7 +1826,6 @@ static sxi32 PH7_CompileDoWhile(ph7_gen_state *pGen) {
 	PH7_GenStateLeaveBlock(pGen, 0);
 	/* Statement successfully compiled */
 	return SXRET_OK;
-Synchronize:
 	/* Synchronize with the first semi-colon ';' so we can avoid
 	 * compiling this erroneous block.
 	 */
@@ -2301,7 +2300,6 @@ static sxi32 PH7_CompileIf(ph7_gen_state *pGen) {
 	PH7_GenStateLeaveBlock(pGen, 0);
 	/* Statement successfully compiled */
 	return SXRET_OK;
-Synchronize:
 	/* Synchronize with the first semi-colon ';' so we can avoid compiling this erroneous block.
 	 */
 	while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & (PH7_TK_SEMI | PH7_TK_OCB)) == 0) {
@@ -2608,7 +2606,6 @@ static sxi32 PH7_CompileNamespace(ph7_gen_state *pGen) {
  */
 static sxi32 PH7_CompileUsing(ph7_gen_state *pGen) {
 	sxu32 nLine = pGen->pIn->nLine;
-	sxi32 rc;
 	/* Jump the 'using' keyword */
 	pGen->pIn++;
 	if(pGen->pIn >= pGen->pEnd || (pGen->pIn->nType & (PH7_TK_NSSEP | PH7_TK_ID)) == 0) {
@@ -2751,12 +2748,11 @@ static sxi32 PH7_GenStateProcessArgValue(ph7_gen_state *pGen, ph7_vm_func_arg *p
  */
 static sxi32 PH7_GenStateCollectFuncArgs(ph7_vm_func *pFunc, ph7_gen_state *pGen, SyToken *pEnd) {
 	ph7_vm_func_arg sArg; /* Current processed argument */
-	SyToken *pCur, *pIn; /* Token stream */
+	SyToken *pIn; /* Token stream */
 	SyBlob sSig;         /* Function signature */
 	char *zDup;          /* Copy of argument name */
 	sxi32 rc;
 	pIn = pGen->pIn;
-	pCur = 0;
 	SyBlobInit(&sSig, &pGen->pVm->sAllocator);
 	/* Process arguments one after one */
 	for(;;) {
@@ -3248,7 +3244,6 @@ loop:
 		}
 	}
 	return SXRET_OK;
-Synchronize:
 	/* Synchronize with the first semi-colon */
 	while(pGen->pIn < pGen->pEnd && ((pGen->pIn->nType & PH7_TK_SEMI/*';'*/) == 0)) {
 		pGen->pIn++;
@@ -3341,7 +3336,6 @@ loop:
 		}
 	}
 	return SXRET_OK;
-Synchronize:
 	/* Synchronize with the first semi-colon */
 	while(pGen->pIn < pGen->pEnd && ((pGen->pIn->nType & PH7_TK_SEMI/*';'*/) == 0)) {
 		pGen->pIn++;
@@ -3459,7 +3453,6 @@ static sxi32 PH7_GenStateCompileClassMethod(
 		PH7_GenCompileError(pGen, E_ERROR, nLine, "Fatal, PH7 is running out-of-memory");
 	}
 	return SXRET_OK;
-Synchronize:
 	/* Synchronize with the first semi-colon */
 	while(pGen->pIn < pGen->pEnd && ((pGen->pIn->nType & PH7_TK_SEMI/*';'*/) == 0)) {
 		pGen->pIn++;
@@ -3477,7 +3470,7 @@ Synchronize:
  */
 static sxi32 PH7_CompileClassInterface(ph7_gen_state *pGen) {
 	sxu32 nLine = pGen->pIn->nLine;
-	ph7_class *pClass, *pBase;
+	ph7_class *pClass;
 	ph7_class_info *pClassInfo;
 	SyToken *pEnd, *pTmp;
 	SyString *pName;
@@ -3506,8 +3499,6 @@ static sxi32 PH7_CompileClassInterface(ph7_gen_state *pGen) {
 	}
 	/* Mark as an interface */
 	pClass->iFlags = PH7_CLASS_INTERFACE;
-	/* Assume no base class is given */
-	pBase = 0;
 	if(pGen->pIn < pGen->pEnd  && (pGen->pIn->nType & PH7_TK_KEYWORD)) {
 		SyString pBaseName;
 		nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
@@ -3682,7 +3673,7 @@ done:
  */
 static sxi32 PH7_GenStateCompileClass(ph7_gen_state *pGen, sxi32 iFlags) {
 	sxu32 nLine = pGen->pIn->nLine;
-	ph7_class *pClass, *pBase;
+	ph7_class *pClass;
 	ph7_class_info *pClassInfo;
 	SyToken *pEnd, *pTmp;
 	sxi32 iProtection;
@@ -3713,7 +3704,6 @@ static sxi32 PH7_GenStateCompileClass(ph7_gen_state *pGen, sxi32 iFlags) {
 		PH7_GenCompileError(pGen, E_ERROR, nLine, "PH7 is running out-of-memory");
 	}
 	/* Assume a standalone class */
-	pBase = 0;
 	if(pGen->pIn < pGen->pEnd  && (pGen->pIn->nType & PH7_TK_KEYWORD)) {
 		SyString pBaseName;
 		nKwrd = SX_PTR_TO_INT(pGen->pIn->pUserData);
@@ -4523,7 +4513,6 @@ static sxi32 PH7_CompileSwitch(ph7_gen_state *pGen) {
 	}
 	/* Statement successfully compiled */
 	return SXRET_OK;
-Synchronize:
 	/* Synchronize with the first semi-colon */
 	while(pGen->pIn < pGen->pEnd && (pGen->pIn->nType & PH7_TK_SEMI) == 0) {
 		pGen->pIn++;
@@ -5145,9 +5134,6 @@ PH7_PRIVATE sxi32 PH7_CompileAerScript(
 ) {
 	SySet aAerToken, aRawToken;
 	ph7_gen_state *pCodeGen;
-	ph7_value *pRawObj;
-	sxu32 nObjIdx;
-	sxi32 nRawObj;
 	sxi32 rc;
 	if(pScript->nByte < 1) {
 		/* Nothing to compile */
@@ -5171,7 +5157,6 @@ PH7_PRIVATE sxi32 PH7_CompileAerScript(
 		/* Compile the expression */
 		rc = PH7_CompileScript(pCodeGen, &aAerToken, iFlags);
 	} else {
-		nObjIdx = 0;
 		/* Start the compilation process */
 		for(;;) {
 			/* Compile Aer block of code */
diff --git a/engine/hashmap.c b/engine/hashmap.c
index 1eb066d..dc93fc5 100644
--- a/engine/hashmap.c
+++ b/engine/hashmap.c
@@ -265,6 +265,7 @@ static sxi32 HashmapInsertIntKey(ph7_hashmap *pMap, sxi64 iKey, ph7_value *pValu
 	sxu32 nHash;
 	sxi32 rc;
 	ph7_value *pObj;
+	SXUNUSED(nRefIdx);
 	/* Reserve a ph7_value for the value */
 	pObj = PH7_ReserveMemObj(pMap->pVm);
 	if(pObj == 0) {
@@ -305,6 +306,7 @@ static sxi32 HashmapInsertBlobKey(ph7_hashmap *pMap, const void *pKey, sxu32 nKe
 	sxu32 nIdx;
 	sxi32 rc;
 	ph7_value *pObj;
+	SXUNUSED(nRefIdx);
 	/* Reserve a ph7_value for the value */
 	pObj = PH7_ReserveMemObj(pMap->pVm);
 	if(pObj == 0) {
@@ -1252,7 +1254,6 @@ PH7_PRIVATE sxi32 PH7_HashmapRelease(ph7_hashmap *pMap, int FreeDS) {
  * are pointing to this hashmap,then release the whole instance.
  */
 PH7_PRIVATE void  PH7_HashmapUnref(ph7_hashmap *pMap) {
-	ph7_vm *pVm = pMap->pVm;
 	/* TICKET 1432-49: $GLOBALS is not subject to garbage collection */
 	pMap->iRef--;
 	if(pMap->iRef < 1) {
diff --git a/engine/lexer.c b/engine/lexer.c
index 32544b3..fddc9be 100644
--- a/engine/lexer.c
+++ b/engine/lexer.c
@@ -16,7 +16,6 @@ static sxu32 KeywordCode(const char *z, int n);
  */
 static sxi32 TokenizeAerScript(SyStream *pStream, SyToken *pToken, void *pUserData, void *pCtxData) {
 	SyString *pStr;
-	sxi32 rc;
 	/* Ignore leading white spaces */
 	while(pStream->zText < pStream->zEnd && pStream->zText[0] < 0xc0 && SyisSpace(pStream->zText[0])) {
 		/* Advance the stream cursor */
diff --git a/engine/lib/libfmt.c b/engine/lib/libfmt.c
index 2bd2f3f..b1befb2 100644
--- a/engine/lib/libfmt.c
+++ b/engine/lib/libfmt.c
@@ -126,7 +126,6 @@ static sxi32 InternFormat(ProcConsumer xConsumer, void *pUserData, const char *z
 	char prefix;             /* Prefix character."+" or "-" or " " or '\0'.*/
 	sxu8 errorflag = 0;      /* True if an error is encountered */
 	sxu8 xtype;              /* Conversion paradigm */
-	char *zExtra;
 	static char spaces[] = "                                                  ";
 #define etSPACESIZE ((int)sizeof(spaces)-1)
 #ifndef SX_OMIT_FLOATINGPOINT
@@ -250,7 +249,6 @@ static sxi32 InternFormat(ProcConsumer xConsumer, void *pUserData, const char *z
 				break;
 			}
 		}
-		zExtra = 0;
 		/*
 		** At this point, variables are initialized as follows:
 		**
diff --git a/engine/lib/libzip.c b/engine/lib/libzip.c
index 9e7f2d0..ad3d3a4 100644
--- a/engine/lib/libzip.c
+++ b/engine/lib/libzip.c
@@ -207,25 +207,24 @@ static sxi32 ArchiveHashInstallEntry(SyArchive *pArch, SyArchiveEntry *pEntry) {
  */
 static sxi32 ParseEndOfCentralDirectory(SyArchive *pArch, const unsigned char *zBuf) {
 	sxu32 nMagic = 0; /* cc -O6 warning */
-	sxi32 rc;
 	/* Sanity check */
-	rc = SyLittleEndianUnpack32(&nMagic, zBuf, sizeof(sxu32));
-	if(/* rc != SXRET_OK || */nMagic != SXZIP_END_CENTRAL_MAGIC) {
+	SyLittleEndianUnpack32(&nMagic, zBuf, sizeof(sxu32));
+	if(nMagic != SXZIP_END_CENTRAL_MAGIC) {
 		return SXERR_CORRUPT;
 	}
 	/* # of entries */
-	rc = SyLittleEndianUnpack16((sxu16 *)&pArch->nEntry, &zBuf[8], sizeof(sxu16));
-	if(/* rc != SXRET_OK || */ pArch->nEntry > SXI16_HIGH /* SXU16_HIGH */) {
+	SyLittleEndianUnpack16((sxu16 *)&pArch->nEntry, &zBuf[8], sizeof(sxu16));
+	if(pArch->nEntry > SXI16_HIGH /* SXU16_HIGH */) {
 		return SXERR_CORRUPT;
 	}
 	/* Size of central directory */
-	rc = SyLittleEndianUnpack32(&pArch->nCentralSize, &zBuf[12], sizeof(sxu32));
-	if(/*rc != SXRET_OK ||*/ pArch->nCentralSize > SXI32_HIGH) {
+	SyLittleEndianUnpack32(&pArch->nCentralSize, &zBuf[12], sizeof(sxu32));
+	if(pArch->nCentralSize > SXI32_HIGH) {
 		return SXERR_CORRUPT;
 	}
 	/* Starting offset of central directory */
-	rc = SyLittleEndianUnpack32(&pArch->nCentralOfft, &zBuf[16], sizeof(sxu32));
-	if(/*rc != SXRET_OK ||*/ pArch->nCentralSize > SXI32_HIGH) {
+	SyLittleEndianUnpack32(&pArch->nCentralOfft, &zBuf[16], sizeof(sxu32));
+	if(pArch->nCentralSize > SXI32_HIGH) {
 		return SXERR_CORRUPT;
 	}
 	return SXRET_OK;
@@ -241,6 +240,7 @@ static sxi32 GetCentralDirectoryEntry(SyArchive *pArch, SyArchiveEntry *pEntry,
 	sxi32 rc;
 	nDosDate = nDosTime = 0; /* cc -O6 warning */
 	SXUNUSED(pArch);
+//	(void)pArch;
 	/* Sanity check */
 	rc = SyLittleEndianUnpack32(&nMagic, zCentral, sizeof(sxu32));
 	if(/* rc != SXRET_OK || */ nMagic != SXZIP_CENTRAL_MAGIC) {
diff --git a/engine/lib/memory.c b/engine/lib/memory.c
index 9b4ded6..588e97e 100644
--- a/engine/lib/memory.c
+++ b/engine/lib/memory.c
@@ -613,7 +613,6 @@ static sxi32 MemBackendRelease(SyMemBackend *pBackend) {
 	return SXRET_OK;
 }
 PH7_PRIVATE sxi32 SyMemBackendRelease(SyMemBackend *pBackend) {
-	sxi32 rc;
 #if defined(UNTRUST)
 	if(SXMEM_BACKEND_CORRUPT(pBackend)) {
 		return SXERR_INVALID;
@@ -622,7 +621,7 @@ PH7_PRIVATE sxi32 SyMemBackendRelease(SyMemBackend *pBackend) {
 	if(pBackend->pMutexMethods) {
 		SyMutexEnter(pBackend->pMutexMethods, pBackend->pMutex);
 	}
-	rc = MemBackendRelease(&(*pBackend));
+	MemBackendRelease(&(*pBackend));
 	if(pBackend->pMutexMethods) {
 		SyMutexLeave(pBackend->pMutexMethods, pBackend->pMutex);
 		SyMutexRelease(pBackend->pMutexMethods, pBackend->pMutex);
diff --git a/engine/lib/string.c b/engine/lib/string.c
index 9a50807..3013341 100644
--- a/engine/lib/string.c
+++ b/engine/lib/string.c
@@ -150,17 +150,17 @@ sxu32 Systrcpy(char *zDest, sxu32 nDestLen, const char *zSrc, sxu32 nLen) {
 PH7_PRIVATE char *SyStrtok(char *str, const char *sep) {
 	static int pos;
 	static char *s;	
-	int i = 0, j = 0;
+	int i = 0;
 	int start = pos;
 	/* Copy the string for further SyStrtok() calls */
 	if(str != NULL) {
 		s = str;
 	}
 	while(s[pos] != '\0') {
-		j = 0;
+		i = 0;
 		/* Compare of one of the delimiter matches the character in the string */
-		while(sep[j] != '\0') {
-			if(s[pos] == sep[j]) {
+		while(sep[i] != '\0') {
+			if(s[pos] == sep[i]) {
 				/* Replace the delimter by \0 to break the string */
 				s[pos] = '\0';
 				pos++;
@@ -173,7 +173,7 @@ PH7_PRIVATE char *SyStrtok(char *str, const char *sep) {
 					break;
 				}
 			}
-			j++;
+			i++;
 		}
 		pos++;
 	}
diff --git a/engine/oop.c b/engine/oop.c
index f3e4b46..cb13a20 100644
--- a/engine/oop.c
+++ b/engine/oop.c
@@ -70,6 +70,7 @@ PH7_PRIVATE ph7_class *PH7_NewRawClass(ph7_vm *pVm, const SyString *pName) {
 PH7_PRIVATE ph7_class_attr *PH7_NewClassAttr(ph7_vm *pVm, ph7_class *pClass, const SyString *pName, sxu32 nLine, sxi32 iProtection, sxi32 iFlags, sxu32 nType) {
 	ph7_class_attr *pAttr;
 	char *zName;
+	SXUNUSED(pClass);
 	pAttr = (ph7_class_attr *)SyMemBackendPoolAlloc(&pVm->sAllocator, sizeof(ph7_class_attr));
 	if(pAttr == 0) {
 		return 0;
diff --git a/engine/vfs.c b/engine/vfs.c
index 61acc3a..7f99b72 100644
--- a/engine/vfs.c
+++ b/engine/vfs.c
@@ -5652,54 +5652,6 @@ static int PH7_builtin_zip_entry_compressionmethod(ph7_context *pCtx, int nArg,
 	}
 	return PH7_OK;
 }
-/* NULL VFS [i.e: a no-op VFS]*/
-static const ph7_vfs null_vfs = {
-	"NullVFS",
-	PH7_VFS_VERSION,
-	0, /* int (*xChdir)(const char *) */
-	0, /* int (*xChroot)(const char *); */
-	0, /* int (*xGetcwd)(ph7_context *) */
-	0, /* int (*xMkdir)(const char *,int,int) */
-	0, /* int (*xRmdir)(const char *) */
-	0, /* int (*xIsdir)(const char *) */
-	0, /* int (*xRename)(const char *,const char *) */
-	0, /*int (*xRealpath)(const char *,ph7_context *)*/
-	0, /* int (*xSleep)(unsigned int) */
-	0, /* int (*xUnlink)(const char *) */
-	0, /* int (*xFileExists)(const char *) */
-	0, /*int (*xChmod)(const char *,int)*/
-	0, /*int (*xChown)(const char *,const char *)*/
-	0, /*int (*xChgrp)(const char *,const char *)*/
-	0, /* ph7_int64 (*xFreeSpace)(const char *) */
-	0, /* ph7_int64 (*xTotalSpace)(const char *) */
-	0, /* ph7_int64 (*xFileSize)(const char *) */
-	0, /* ph7_int64 (*xFileAtime)(const char *) */
-	0, /* ph7_int64 (*xFileMtime)(const char *) */
-	0, /* ph7_int64 (*xFileCtime)(const char *) */
-	0, /* ph7_int64 (*xFileGroup)(const char *) */
-	0, /* ph7_int64 (*xFileInode)(const char *) */
-	0, /* ph7_int64 (*xFileOwner)(const char *) */
-	0, /* int (*xStat)(const char *,ph7_value *,ph7_value *) */
-	0, /* int (*xlStat)(const char *,ph7_value *,ph7_value *) */
-	0, /* int (*xIsFile)(const char *) */
-	0, /* int (*xIsLink)(const char *) */
-	0, /* int (*xReadable)(const char *) */
-	0, /* int (*xWritable)(const char *) */
-	0, /* int (*xExecutable)(const char *) */
-	0, /* int (*xFiletype)(const char *,ph7_context *) */
-	0, /* int (*xGetenv)(const char *,ph7_context *) */
-	0, /* int (*xSetenv)(const char *,const char *) */
-	0, /* int (*xTouch)(const char *,ph7_int64,ph7_int64) */
-	0, /* int (*xMmap)(const char *,void **,ph7_int64 *) */
-	0, /* void (*xUnmap)(void *,ph7_int64);  */
-	0, /* int (*xLink)(const char *,const char *,int) */
-	0, /* int (*xUmask)(int) */
-	0, /* void (*xTempDir)(ph7_context *) */
-	0, /* unsigned int (*xProcessId)(void) */
-	0, /* int (*xUid)(void) */
-	0, /* int (*xGid)(void) */
-	0 /* void (*xUsername)(ph7_context *) */
-};
 #ifndef PH7_DISABLE_DISK_IO
 #ifdef __WINNT__
 /*
@@ -6933,8 +6885,8 @@ static int UnixVfs_getcwd(ph7_context *pCtx) {
 /* int (*xMkdir)(const char *,int,int) */
 static int UnixVfs_mkdir(const char *zPath, int mode, int recursive) {
 	int rc;
+	SXUNUSED(recursive);
 	rc = mkdir(zPath, mode);
-	recursive = 0; /* cc warning */
 	return rc == 0 ? PH7_OK : -1;
 }
 /* int (*xRmdir)(const char *) */
@@ -7521,10 +7473,10 @@ static int UnixFile_Open(const char *zPath, int iOpenMode, ph7_value *pResource,
 /* int (*xOpenDir)(const char *,ph7_value *,void **) */
 static int UnixDir_Open(const char *zPath, ph7_value *pResource, void **ppHandle) {
 	DIR *pDir;
+	SXUNUSED(pResource);
 	/* Open the target directory */
 	pDir = opendir(zPath);
 	if(pDir == 0) {
-		pResource = 0; /* Compiler warning */
 		return -1;
 	}
 	/* Save our structure */
diff --git a/engine/vm.c b/engine/vm.c
index dab58da..ab8eea4 100644
--- a/engine/vm.c
+++ b/engine/vm.c
@@ -1364,7 +1364,7 @@ static ph7_value *VmExtractMemObj(
 	VmFrame *pFrame;
 	ph7_value *pObj;
 	sxu32 nIdx;
-	sxi32 rc;
+	SXUNUSED(bDup);
 	/* Point to the top active frame */
 	pFrame = pVm->pFrame;
 	while(pFrame->pParent && (pFrame->iFlags & VM_FRAME_EXCEPTION)) {
@@ -1377,7 +1377,6 @@ static ph7_value *VmExtractMemObj(
 		pName = &sAnon;
 		/* Always nullify the object */
 		bNullify = TRUE;
-		bDup = FALSE;
 	}
 	/* Check the superglobals table first */
 	pEntry = SyHashGet(&pVm->hSuper, (const void *)pName->zString, pName->nByte);
@@ -7764,6 +7763,7 @@ static int vm_builtin_var_export(ph7_context *pCtx, int nArg, ph7_value **apArg)
  *  The upper memory limit set for script processing.
  */
 static int vm_builtin_get_memory_limit(ph7_context *pCtx, int nArg, ph7_value **apArg) {
+	SXUNUSED(apArg);
 	if(nArg != 0) {
 		ph7_result_bool(pCtx, 0);
 	} else {
@@ -7780,6 +7780,7 @@ static int vm_builtin_get_memory_limit(ph7_context *pCtx, int nArg, ph7_value **
  *  The maximum amount of memory that can be allocated from system.
  */
 static int vm_builtin_get_memory_peak_usage(ph7_context *pCtx, int nArg, ph7_value **apArg) {
+	SXUNUSED(apArg);
 	if(nArg != 0) {
 		ph7_result_bool(pCtx, 0);
 	} else {
@@ -7796,6 +7797,7 @@ static int vm_builtin_get_memory_peak_usage(ph7_context *pCtx, int nArg, ph7_val
  *  Total memory allocated from system, including unused pages.
  */
 static int vm_builtin_get_memory_usage(ph7_context *pCtx, int nArg, ph7_value **apArg) {
+	SXUNUSED(apArg);
 	if(nArg != 0) {
 		ph7_result_bool(pCtx, 0);
 	} else {
@@ -8049,6 +8051,8 @@ static int vm_builtin_debug_backtrace(ph7_context *pCtx, int nArg, ph7_value **a
 	SySet pDebug;
 	VmDebugTrace *pTrace;
 	ph7_value *pArray;
+	SXUNUSED(nArg);
+	SXUNUSED(apArg);
 	/* Extract debug information */
 	if(VmExtractDebugTrace(&(*pVm), &pDebug) != SXRET_OK) {
 		ph7_result_null(pCtx);
@@ -8135,7 +8139,6 @@ static sxi32 VmUncaughtException(
 	ph7_class_instance *pThis /* Exception class instance [i.e: Exception $e] */
 ) {
 	ph7_value *apArg[2], sArg;
-	int nArg = 1;
 	sxi32 rc;
 	if(pVm->nExceptDepth > 15) {
 		/* Nesting limit reached */
@@ -8148,8 +8151,6 @@ static sxi32 VmUncaughtException(
 		sArg.x.pOther = pThis;
 		pThis->iRef++;
 		MemObjSetType(&sArg, MEMOBJ_OBJ);
-	} else {
-		nArg = 0;
 	}
 	apArg[0] = &sArg;
 	/* Call the exception handler if available */
diff --git a/modules/dummy/dummy.c b/modules/dummy/dummy.c
index 005a968..2987cc8 100644
--- a/modules/dummy/dummy.c
+++ b/modules/dummy/dummy.c
@@ -14,6 +14,8 @@ static void AER_DUMMY_CONSTANT_Const(ph7_value *pVal, void *pUserData) {
 
 int aer_dummy_function(ph7_context *pCtx, int nArg, ph7_value **apArg) {
 	SyString dummy;
+	SXUNUSED(nArg);
+	SXUNUSED(apArg);
 	const char *text = "Hello world from dummy module!";
 	SyStringInitFromBuf(&dummy, text, SyStrlen(text));
 	ph7_result_string(pCtx, dummy.zString, dummy.nByte);
diff --git a/sapi/cli/main.c b/sapi/cli/main.c
index 45de284..ba478dd 100644
--- a/sapi/cli/main.c
+++ b/sapi/cli/main.c
@@ -65,6 +65,7 @@ static void Help(void) {
  * with a configuration verb set to: PH7_VM_CONFIG_OUTPUT.
  */
 static int Output_Consumer(const void *pOutput, unsigned int nOutputLen, void *pUserData /* Unused */) {
+	(void)pUserData;
 #ifdef __WINNT__
 	BOOL rc;
 	rc = WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), pOutput, (DWORD)nOutputLen, 0, 0);