diff --git a/Makefile b/Makefile
index 2813eca..46822b1 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # makefile to fail if any command in pipe is failed.
 SHELL = /bin/bash -o pipefail
 
-# using gcc version 5.4.1 20161213 (Linaro GCC 5.4-2017.01-rc2)
+# using gcc version 7.5.0 (Linaro GCC 7.5-2019.12)
 BASE    = arm-linux-gnueabihf
 
 CC      = $(BASE)-gcc
@@ -46,7 +46,7 @@ OBJ	= $(C_SRC:.c=.c.o) $(CPP_SRC:.cpp=.cpp.o) $(IMG:.png=.png.o)
 DEP	= $(C_SRC:.c=.c.d) $(CPP_SRC:.cpp=.cpp.d)
 
 DFLAGS	= $(INCLUDE) -D_7ZIP_ST -DPACKAGE_VERSION=\"1.3.3\" -DFLAC_API_EXPORTS -DFLAC__HAS_OGG=0 -DHAVE_LROUND -DHAVE_STDINT_H -DHAVE_STDLIB_H -DHAVE_SYS_PARAM_H -DENABLE_64_BIT_WORDS=0 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -DVDATE=\"`date +"%y%m%d"`\"
-CFLAGS	= $(DFLAGS) -Wall -Wextra -Wno-strict-aliasing -c -O3
+CFLAGS	= $(DFLAGS) -Wall -Wextra -Wno-strict-aliasing -Wno-format-truncation -Wno-psabi -c -O3
 LFLAGS	= -lc -lstdc++ -lm -lrt $(IMLIB2_LIB) 
 
 $(PRJ): $(OBJ)
diff --git a/MiSTer.vcxproj b/MiSTer.vcxproj
index 01f275a..e7857cf 100644
--- a/MiSTer.vcxproj
+++ b/MiSTer.vcxproj
@@ -30,7 +30,7 @@
     <NMakeOutput>MiSTer</NMakeOutput>
     <NMakeCleanCommandLine>git.lnk ./clean.sh</NMakeCleanCommandLine>
     <NMakePreprocessorDefinitions>__arm__;__GNUC__;__USE_GNU ;_GNU_SOURCE;VDATE="000000";_FILE_OFFSET_BITS=64;_LARGEFILE64_SOURCE;$(NMakePreprocessorDefinitions)</NMakePreprocessorDefinitions>
-    <NMakeIncludeSearchPath>c:\Work\Git\opt\gcc54\arm-linux-gnueabihf\libc\usr\include;c:\Work\Git\opt\gcc54\lib\gcc\arm-linux-gnueabihf\5.4.1\include;c:\Work\Git\opt\gcc54\arm-linux-gnueabihf\include\c++\5.4.1;c:\Work\Git\opt\gcc54\arm-linux-gnueabihf\include\c++\5.4.1\arm-linux-gnueabihf;$(NMakeIncludeSearchPath);lib\libco;lib\miniz;lib\lodepng</NMakeIncludeSearchPath>
+    <NMakeIncludeSearchPath>c:\Work\Git\opt\gcc75\arm-linux-gnueabihf\libc\usr\include;c:\Work\Git\opt\gcc75\lib\gcc\arm-linux-gnueabihf\7.5.0\include;c:\Work\Git\opt\gcc75\arm-linux-gnueabihf\include\c++\7.5.0;c:\Work\Git\opt\gcc75\arm-linux-gnueabihf\include\c++\7.5.0\arm-linux-gnueabihf;$(NMakeIncludeSearchPath);lib\libco;lib\miniz;lib\lodepng</NMakeIncludeSearchPath>
     <OutDir>$(TEMP)</OutDir>
     <IntDir>$(TEMP)</IntDir>
     <AdditionalOptions>
diff --git a/lib/flac/src/include/share/alloc.h b/lib/flac/src/include/share/alloc.h
index 914de9b..ff93945 100644
--- a/lib/flac/src/include/share/alloc.h
+++ b/lib/flac/src/include/share/alloc.h
@@ -78,7 +78,7 @@ static inline void *safe_calloc_(size_t nmemb, size_t size)
 {
 	if(!nmemb || !size)
 		return malloc(1); /* malloc(0) is undefined; FLAC src convention is to always allocate */
-	return calloc(nmemb, size);
+	return (nmemb <= INT_MAX) ? calloc(nmemb, size) : NULL;
 }
 
 /*@@@@ there's probably a better way to prevent overflows when allocating untrusted sums but this works for now */
diff --git a/lib/libchdr/libchdr_chd.c b/lib/libchdr/libchdr_chd.c
index a3991e0..416769b 100644
--- a/lib/libchdr/libchdr_chd.c
+++ b/lib/libchdr/libchdr_chd.c
@@ -1272,6 +1272,8 @@ static chd_error decompress_v5_map(chd_file* chd, chd_header* header)
 			/* pseudo-types; convert into base types */
 			case COMPRESSION_SELF_1:
 				last_self++;
+				// fall through
+
 			case COMPRESSION_SELF_0:
 				rawmap[0] = COMPRESSION_SELF;
 				offset = last_self;
@@ -1284,6 +1286,8 @@ static chd_error decompress_v5_map(chd_file* chd, chd_header* header)
 
 			case COMPRESSION_PARENT_1:
 				last_parent += header->hunkbytes / header->unitbytes;
+				// fall through
+
 			case COMPRESSION_PARENT_0:
 				rawmap[0] = COMPRESSION_PARENT;
 				offset = last_parent;
diff --git a/menu.cpp b/menu.cpp
index 7d0c687..1cd2109 100644
--- a/menu.cpp
+++ b/menu.cpp
@@ -5525,6 +5525,7 @@ void HandleUI(void)
 		while(m < OsdGetSize()-1) OsdWrite(m++, "");
 		OsdWrite(15, STD_EXIT, menusub == 5);
 		menustate = MENU_SYSTEM2;
+		break;
 
 	case MENU_SYSTEM2:
 		if (menu)
diff --git a/support/arcade/mra_loader.cpp b/support/arcade/mra_loader.cpp
index a2420a1..b224ba1 100644
--- a/support/arcade/mra_loader.cpp
+++ b/support/arcade/mra_loader.cpp
@@ -728,13 +728,13 @@ static int xml_send_rom(XMLEvent evt, const XMLNode* node, SXML_CHAR* text, cons
 		 * the buffer_append is part of a buffer library that will realloc automatically
 		 */
 		{
-		int result = buffer_append(arc_info->data, text);
-		if (result<0)
-			printf("buffer_append failed %d\n",result);
+			int result = buffer_append(arc_info->data, text);
+			if (result<0)
+				printf("buffer_append failed %d\n",result);
 			if (result==-1)
-			   printf("-1 no data given\n");
+				printf("-1 no data given\n");
 			if (result==-2)
-			   printf("-2 could not allocate\n");
+				printf("-2 could not allocate\n");
 		}
 		//printf("XML_EVENT_TEXT: text [%s]\n",text);
 		break;