got rid of compilation warnings

Makefile

@@ -212,7 +212,7 @@ $(DIR_ACME) $(SRC_ACME) $(HDR_ACME):
 $(TOOL_ASSEMBLER): $(DIR_ACME) $(SRC_ACME) $(HDR_ACME)
 	@mkdir -p build/tools
 	echo $(OUT_ACME)
-	$(CC) -o $(TOOL_ASSEMBLER) $(SRC_ACME) -lm -I./assembler/acme/src
+	$(CC) -o $(TOOL_ASSEMBLER) $(SRC_ACME) -lm -w -I./assembler/acme/src
 
 $(TOOL_PNGPREPARE): tools/pngprepare.c
 	@mkdir -p build/tools

tools/similarity.c

@@ -245,7 +245,7 @@ int main(int argc,char **argv)
 	  if (f) {
 	    // Get explanation why this match is irrelevant
 	    char line[1024]; line[0]=0;
-	    fgets(line,1024,f);
+	    if (0 == fgets(line,1024,f)) fprintf(stderr,"Warning: null fgets result\n");
 	    while (line[0]&&line[strlen(line)-1]=='\r') line[strlen(line)-1]=0;
 	    while (line[0]&&line[strlen(line)-1]=='\n') line[strlen(line)-1]=0;
 	    if (verbose)