Organize Makefile so clang works on all platforms, warnings are set

Delete warning flags included by -Wall, -Wextra, or produce false postives

test/Makefile

 CC = gcc
 ifeq ($(shell uname -s), Darwin)
 CC = clang
-CFLAGS += -std=c99 -pedantic -Wall -Weverything -Werror
-CFLAGS += -Wno-unknown-warning-option -Wno-switch-enum
-CFLAGS += -Wno-padded -Wno-double-promotion -Wno-missing-noreturn
-CFLAGS += -Wno-missing-prototypes
 endif
-ifeq ($(shell uname -s), Linux)
-CFLAGS += -std=c99 -pedantic -Wall -Wextra -Werror
+ifeq ($(findstring clang, $(CC)), clang)
+E = -Weverything
+CFLAGS += $E -Wno-unknown-warning-option -Wno-missing-prototypes
+CFLAGS += -Wno-unused-macros -Wno-padded -Wno-missing-noreturn
 endif
+CFLAGS += -std=c99 -pedantic -Wall -Wextra -Wconversion -Werror
+CFLAGS += -Wno-switch-enum -Wno-double-promotion
+CFLAGS += -Wbad-function-cast -Wcast-qual -Wold-style-definition -Wshadow -Wstrict-overflow \
+          -Wstrict-prototypes -Wswitch-default -Wundef
 #DEBUG = -O0 -g
 CFLAGS += $(DEBUG)
 DEFINES =  -D UNITY_OUTPUT_CHAR=putcharSpy
-DEFINES += -D UNITY_SUPPORT_64 -D UNITY_INCLUDE_DOUBLE -D UNITY_NO_WEAK
+DEFINES += -D UNITY_SUPPORT_64 -D UNITY_INCLUDE_DOUBLE
 SRC = ../src/unity.c tests/testunity.c build/testunityRunner.c
 INC_DIR = -I ../src
 COV_FLAGS = -fprofile-arcs -ftest-coverage -I ../../src
@@ -23,6 +25,7 @@ TARGET = build/testunity-cov.exe
 # For verbose output of all the tests, run 'make test'.
 default: coverage
 .PHONY: default coverage test clean
+coverage: DEFINES += -D UNITY_NO_WEAK
 coverage: $(BUILD_DIR)/testunityRunner.c
 	cd $(BUILD_DIR) && \
 	$(CC) $(CFLAGS) $(DEFINES) $(foreach i,$(SRC), ../$i) $(COV_FLAGS) -o ../$(TARGET)
@@ -32,9 +35,6 @@ coverage: $(BUILD_DIR)/testunityRunner.c
 	gcov unity.c | head -3
 	grep '###' $(BUILD_DIR)/unity.c.gcov -C2 || true
 
-test: CFLAGS += -Wbad-function-cast -Wcast-qual -Wconversion -Wformat=2 -Wold-style-definition \
--Wpointer-arith -Wredundant-decls -Wshadow -Wstrict-overflow=5 -Wstrict-prototypes             \
--Wswitch-default -Wundef -Wunreachable-code -Wunused -fstrict-aliasing
 test: $(BUILD_DIR)/testunityRunner.c
 	$(CC) $(CFLAGS) $(DEFINES) $(INC_DIR) $(SRC) -o $(TARGET)
 	./$(TARGET)
@@ -50,11 +50,11 @@ $(BUILD_DIR)/testunityRunner.c: tests/testunity.c | $(BUILD_DIR)
 
 AWK_SCRIPT=\
   '/^void test/{ declarations[d++]=$$0; gsub(/\(?void\)? ?/,""); tests[t++]=$$0; line[u++]=NR } \
-  END{ print "\#include \"unity.h\" /* Autogenerated by awk in Makefile */" ;   \
-       for (i=0; i<d; i++) { print declarations[i] ";" }                        \
-       printf "int main(void)\n{\n    UNITY_BEGIN();\n" ;                       \
-       for (i=0; i<t; i++) { print "    RUN_TEST(" tests[i] ", " line[i] ");" } \
-       printf "    return UNITY_END();\n}\n" }'
+  END{ print "\#include \"unity.h\" /* Autogenerated by awk in Makefile */" ;                   \
+       for (i=0; i<d; i++) { print declarations[i] ";" }                                        \
+       print "int main(void)\n{\n    UnityBegin(\"" FILENAME "\");" ;                           \
+       for (i=0; i<t; i++) { print "    RUN_TEST(" tests[i] ", " line[i] ");" }                 \
+       print "    return UNITY_END();\n}" }'
 
 $(BUILD_DIR):
 	mkdir -p $(BUILD_DIR)