Added cross-compiling to windows

makefile

@@ -24,9 +24,8 @@ FLAGS += -Wlogical-op
 FLAGS += -Wdisabled-optimization
 FLAGS += -fanalyzer
 FLAGS += -flto
-FLAGS += -fuse-ld=gold
 FLAGS += -s
-flags += -Wl,--gc-sections
+FLAGS += -Wl,--gc-sections
 # These flags are because of the compiler otherwise giving too much warning
 #FLAGS += -Wno-sign-conversion
 #FLAGS += -Wformat-truncation=0
@@ -37,11 +36,12 @@ endif
 
 
 # Compile flag for defining GITHASH to put at the end of the version string
-GITFLAG = -D'GITHASH=$(shell git rev-parse --short=1 HEAD)'
+FLAGS += -D'GITHASH=$(shell git rev-parse --short=1 HEAD)'
 
 # Directories where .o files and excecutables will be placed
 OBJDIR = obj
 OUTDIR = out
+TESTDIR = test
 
 # The UI to compile for by default using make run
 #UI_TARGET = vt100
@@ -53,6 +53,9 @@ LICENSEURL = https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
 
 # C compiler
 CC = cc
+LD = ld
+CC_W64 = x86_64-w64-mingw32-gcc
+LD_W64 = x86_64-w64-mingw32-ld
 
 # Test options
 TEST_COLUMNS = 1000
@@ -67,9 +70,10 @@ MSG_COMPILING = Compiling C:
 MSG_CLEANING = Cleaning:
 MSG_CLEANING_OBJ = Cleaning $(OBJDIR):
 MSG_CLEANING_OUT = Cleaning $(OUTDIR):
+MSG_CLEANING_TEST = Cleaning $(TESTDIR):
 
 # Compile for all UI targets
-all: $(addprefix $(OUTDIR)/connect4_,ncurses.elf vt100.elf stub.elf)
+all: $(addprefix $(OUTDIR)/connect4_,ncurses.elf vt100.elf stub.elf stub.exe)
 
 # Compile and run the default UI target
 run: $(OUTDIR)/connect4_$(UI_TARGET).elf
@@ -80,19 +84,22 @@ run_%: $(OUTDIR)/connect4_%.elf
 	./$<
 
 # Show result of test
-test: test.diff
+test: $(TESTDIR)/test.diff
 
 # Diff between the tests
-test.diff: test.log test.log.slow
+$(TESTDIR)/test.diff: $(TESTDIR)/test.log $(TESTDIR)/test.log.slow
+	@mkdir -p $(@D)
 	diff -y $^ > $@ || tail $@
 	diff -q $^
 
 # Log of testing fast logic
-test.log: $(OUTDIR)/connect4_$(UI_TESTING).elf
+$(TESTDIR)/test.log: $(OUTDIR)/connect4_$(UI_TESTING).elf
+	@mkdir -p $(@D)
 	./$< -o $@ -c $(TEST_COLUMNS) -r $(TEST_ROWS) --random-moves
 
 # Log of testing slow logic
-test.log.slow: $(OUTDIR)/connect4_$(UI_TESTING).elf
+$(TESTDIR)/test.log.slow: $(OUTDIR)/connect4_$(UI_TESTING).elf
+	@mkdir -p $(@D)
 	./$< -o $@ -c $(TEST_COLUMNS) -r $(TEST_ROWS) --random-moves --slow-calcWins
 
 # Compile specifically the ncurses version
@@ -108,25 +115,36 @@ $(OUTDIR)/connect4_%.elf: $(addprefix $(OBJDIR)/,ui_%.o logic.o connect4.o LICEN
 	@mkdir -p $(@D)
 	$(CC) $(FLAGS) -o $@ $^
 
+# Compile a windows excecutable
+$(OUTDIR)/connect4_%.exe: $(addprefix $(OBJDIR)/w64_,ui_%.o logic.o connect4.o LICENSE.o)
+	@echo $(MSG_LINKING) $@
+	@mkdir -p $(@D)
+	$(CC_W64) $(FLAGS) -o $@ $^
+
 # Make an object file for the license so it does not all need to be in the code
 $(OBJDIR)/LICENSE.o: $(OBJDIR)/LICENSE
 	@echo $(MSG_LINKING) $@
 	@mkdir -p $(@D)
-	cd $(@D); ld -r -b binary -o $(@F) $(^F)
+	cd $(@D); $(LD) -r -b binary -o $(@F) $(^F)
 
-# Compile the object file of the main code.
-# This one's special because it includes the git hash
-$(OBJDIR)/connect4.o: connect4.c
-	@echo $(MSG_COMPILING) $^
+# Make an object file for the license so it does not all need to be in the code
+$(OBJDIR)/w64_LICENSE.o: $(OBJDIR)/LICENSE
+	@echo $(MSG_LINKING) $@
 	@mkdir -p $(@D)
-	$(CC) -c $(FLAGS) $(GITFLAG) -o $@ $^
+	cd $(@D); $(LD_W64) -r -b binary -o $(@F) $(^F)
 
-# Generic object file compile
+# Linux object file compile
 $(OBJDIR)/%.o: %.c
 	@echo $(MSG_COMPILING) $^
 	@mkdir -p $(@D)
 	$(CC) -c $(FLAGS) -o $@ $^
 
+# Windows object file compile
+$(OBJDIR)/w64_%.o: %.c
+	@echo $(MSG_COMPILING) $^
+	@mkdir -p $(@D)
+	$(CC_W64) -c $(FLAGS) -o $@ $^
+
 # Download the license file in non-markdown form.
 # This is not cleaned as that would be too silly
 $(OBJDIR)/LICENSE:
@@ -141,3 +159,6 @@ clean:
 	rm -f $(OBJDIR)/*.o
 	@echo $(MSG_CLEANING_OUT)
 	rm -f $(OUTDIR)/*.elf
+	rm -f $(OUTDIR)/*.exe
+	@echo $(MSG_CLEANING_TEST)
+	rm -f $(TESTDIR)/*