Reimplement 'make all'

% make all
This now builds executable, executable_debug, and executable_profile.
This will allow for easy implementation of the autograder building and
testing student solutions. When a SIG occurs, the AG can then run
valgrind with a debug build, to give improved feedback to students.

Build objects (.o files) are now only created for release builds.
Therefore, any .o file found in the directory will be compiled with -O3
and -DNDEBUG. The other two build targets (debug and profile) are
compiled directly from source to executable. This should prevent any
unfortunate hybrid builds.

Some minor documentation and formatting updates were also made.

Makefile

@@ -21,15 +21,14 @@
 # TODO (begin) #
 #######################
 # Change IDENTIFIER to match the project identifier given in the project spec.
-IDENTIFIER = EEC50281EEC50281EEC50281EEC50281EEC50281
+IDENTIFIER  = EEC50281EEC50281EEC50281EEC50281EEC50281
 
 # Change EXECUTABLE to match the command name given in the project spec.
 EXECUTABLE  = executable
-DEBUG       = $(EXECUTABLE)_debug
 
-# The following line looks for a project's main() in a file named project*.cpp,
+# The following line looks for a project's main() in files named project*.cpp,
 # executable.cpp (substituted from EXECUTABLE above), or main.cpp
-PROJECTFILE = $(or $(wildcard project*.cpp), $(wildcard $(EXECUTABLE).cpp), main.cpp)
+PROJECTFILE = $(or $(wildcard project*.cpp $(EXECUTABLE).cpp), main.cpp)
 # If main() is in another file delete line above, edit and uncomment below
 #PROJECTFILE = mymainfile.cpp
 #######################
@@ -76,15 +75,16 @@ CXXFLAGS = -std=c++1z -Wconversion -Wall -Werror -Wextra -pedantic
 release: CXXFLAGS += -O3 -DNDEBUG
 release: $(EXECUTABLE)
 
-# make debug - will compile "all" with $(CXXFLAGS) and the -g flag
+# make debug - will compile sources with $(CXXFLAGS) and the -g3 flag
 #              also defines DEBUG, so "#ifdef DEBUG /*...*/ #endif" works
-debug: EXECUTABLE := $(DEBUG)
 debug: CXXFLAGS += -g3 -DDEBUG
-debug: clean $(EXECUTABLE)
+debug:
+	$(CXX) $(CXXFLAGS) $(SOURCES) -o $(EXECUTABLE)_debug
 
 # make profile - will compile "all" with $(CXXFLAGS) and the -pg flag
 profile: CXXFLAGS += -pg
-profile: clean $(EXECUTABLE)
+profile:
+	$(CXX) $(CXXFLAGS) $(SOURCES) -o $(EXECUTABLE)_profile
 
 # make static - will perform static analysis in the matter currently used
 #               on the autograder
@@ -96,12 +96,15 @@ static:
 #                   include the project identifier; skip subdirectories;
 #                   also removes old submit tarballs, they are outdated
 identifier:
-	@if [ $$(grep --include=*.{h,hpp,c,cpp} --exclude=xcode_redirect.hpp --directories=skip -L $(IDENTIFIER) * | wc -l) -ne 0 ]; then echo -n "Missing project identifier in file(s): ";echo `grep --include=*.{h,hpp,c,cpp} --directories=skip -L $(IDENTIFIER) *`;rm -f $(PARTIAL_SUBMITFILE) $(FULL_SUBMITFILE); exit 1; fi
+	@if [ $$(grep --include=*.{h,hpp,c,cpp} --exclude=xcode_redirect.hpp --directories=skip -L $(IDENTIFIER) * | wc -l) -ne 0 ]; then \
+		echo "Missing project identifier in file(s): \c"; \
+		echo `grep --include=*.{h,hpp,c,cpp} --directories=skip -L $(IDENTIFIER) *`; \
+		rm -f $(PARTIAL_SUBMITFILE) $(FULL_SUBMITFILE); \
+		exit 1; \
+	fi
 
-# Build both release and debug executables
-all: clean
-	$(MAKE) -Rr release
-	$(MAKE) debug
+# Build all executables
+all: release debug profile
 
 $(EXECUTABLE): $(OBJECTS)
 ifeq ($(EXECUTABLE), executable)
@@ -127,7 +130,7 @@ define make_tests
 endef
 $(foreach test, $(TESTS), $(eval $(call make_tests, $(test))))
 
-alltests: clean $(TESTS)
+alltests: $(TESTS)
 
 # rule for creating objects
 %.o: %.cpp
@@ -135,8 +138,8 @@ alltests: clean $(TESTS)
 
 # make clean - remove .o files, executables, tarball
 clean:
-	rm -f $(OBJECTS) $(EXECUTABLE) $(DEBUG) $(TESTS) \
-      $(PARTIAL_SUBMITFILE) $(FULL_SUBMITFILE) $(PERF_FILE)
+	rm -f $(OBJECTS) $(EXECUTABLE) $(EXECUTABLE)_debug $(EXECUTABLE)_profile \
+      $(TESTS) $(PARTIAL_SUBMITFILE) $(FULL_SUBMITFILE) $(PERF_FILE)
 	rm -Rf *.dSYM
 
 # make partialsubmit.tar.gz - cleans, creates tarball