More compile warnings (disabled many for now, they will be re-enabled one-by-one as code that triggers warnings is rectified)

Makefile

@@ -1,5 +1,27 @@
 CC     ?= clang
-CFLAGS += -Wall -I. -pedantic-errors -std=c90 -Wno-attributes
+CFLAGS += -Wall -I. -pedantic-errors -std=c90
+
+#turn on tons of warnings if clang is present
+ifeq ($(CC), clang)
+	CFLAGS += \
+		-Weverything \
+		-Wno-missing-prototypes \
+		-Wno-unused-parameter \
+		-Wno-sign-compare \
+		-Wno-implicit-fallthrough \
+		-Wno-sign-conversion \
+		-Wno-conversion \
+		-Wno-disabled-macro-expansion \
+		-Wno-padded \
+		-Wno-undef \
+		-Wno-conditional-uninitialized \
+		-Wno-missing-noreturn \
+		-Wno-ignored-qualifiers \
+		-Wno-unused-macros \
+		-Wno-format-nonliteral \
+		-Wno-shadow
+
+endif
 OBJ     = lex.o       \
           error.o     \
           parse.o     \
@@ -34,3 +56,5 @@ all: test gmqcc
 
 clean:
 	rm -f *.o gmqcc test_ast test_ir test/*.o
+	
+

lex.c

@@ -124,7 +124,6 @@ static int lex_trigraph(lex_file *file) {
         default:
             lex_unget('?', file);
             lex_unget(ch , file);
-            return '?';
     }
     return '?';
 }

main.c

@@ -105,7 +105,6 @@ int main(int argc, char **argv) {
                 if (util_strncmpexact(&argv[1][1], "memchk", 6)) { opts_memchk = true; break; }
                 if (util_strncmpexact(&argv[1][1], "help",   4)) {
                     return usage(app);
-                    break;
                 }
                 /* compiler type selection */
                 if (util_strncmpexact(&argv[1][1], "std=qcc"   , 7 )) { opts_compiler = COMPILER_QCC;    break; }