Makefile: Use just one makefile; improvements

- Do not use wildcards to generate the list of sources (this has many
   problems and is discouraged, especially for bigger problems)
 - Specify the toolchain to be used through implicit variables
    * mingw32 vs. i686-w64-mingw32
    * g++ vs clang++
 - Use g++ binary instead of gcc
 - automatically generate dependencies (header files) for compilation

.gitignore

@@ -2,3 +2,4 @@
 *.lib
 *.dll
 *.exe
+*.d

3rdParty/PKWare/objs.mak

@@ -0,0 +1,4 @@
+PKWARE_OBJS=3rdParty/PKWare/explode.o \
+	    3rdParty/PKWare/implode.o
+
+-include *.d

Makefile

@@ -1,30 +1,42 @@
-DIABLO_SRC=$(wildcard Source/*.cpp)
-DIABLO_OBJ=$(DIABLO_SRC:.cpp=.o)
+# For 32-bit build systems, the executable is just mingw32
+MINGW32 ?= i686-w64-mingw32
+# Used s.t. we can try to use clang to compile code
+_CXX ?= g++
 
-PKWARE_SRC=$(wildcard 3rdParty/PKWare/*.cpp)
-PKWARE_OBJ=$(PKWARE_SRC:.cpp=.o)
+CXX=$(MINGW32)-$(_CXX)
+DLLTOOL=$(MINGW32)-dlltool
+
+# Clang doesn't understand permissive compilation, we need to "fix" invalid
+# casts from a pointer type there using
+#     static_cast<NEW_TYPE>(reinterpret_cast<uintptr_t>(ptr))
+# instead of
+#     (NEW_TYPE)(ptr)
+CXXFLAGS=-std=c++98 -fpermissive -Wno-write-strings
+CPPFLAGS=-MMD -MF $*.d
+LDLIBS=-lgdi32 -lversion -ldiabloui -lstorm
+LDFLAGS=-L./
 
 all: devilution.exe
 
-devilution.exe: $(DIABLO_OBJ) $(PKWARE_OBJ) diabloui.lib storm.lib
-	i686-w64-mingw32-gcc -L./ -o $@ $^ -lgdi32 -lversion -ldiabloui -lstorm
+include 3rdParty/PKWare/objs.mak
+include Source/objs.mak
 
-%.o: %.cpp
-	i686-w64-mingw32-gcc -c -fpermissive -Wno-write-strings -o $@ $<
+devilution.exe: $(OBJS) $(PKWARE_OBJS) diabloui.lib storm.lib
+	$(CXX) $(LDFLAGS) -o $@ $^ $(LDLIBS)
 
 diabloui.lib: diabloui.dll DiabloUI/diabloui_gcc.def
-	i686-w64-mingw32-dlltool -d DiabloUI/diabloui_gcc.def -D diabloui.dll -l diabloui.lib
+	$(DLLTOOL) -d DiabloUI/diabloui_gcc.def -D $< -l $@
 
 diabloui.dll:
-	echo "Please copy diabloui.dll (version 1.09b) here."
+	$(error Please copy diabloui.dll (version 1.09b) here)
 
 storm.lib: storm.dll 3rdParty/Storm/Source/storm_gcc.def
-	i686-w64-mingw32-dlltool -d 3rdParty/Storm/Source/storm_gcc.def -D storm.dll -l storm.lib
+	$(DLLTOOL) -d 3rdParty/Storm/Source/storm_gcc.def -D $< -l $@
 
 storm.dll:
-	echo "Please copy storm.dll (version 1.09b) here."
+	$(error Please copy storm.dll (version 1.09b) here)
 
 clean:
-	rm -f $(DIABLO_OBJ) $(PKWARE_OBJ)
+	@$(RM) -v $(OBJS) $(OBJS:.o=.d) $(PKWARE_OBJS)  $(PKWARE_OBJS:.o=d)
 
 .PHONY: clean all

Makefile32

@@ -1,30 +0,0 @@
-DIABLO_SRC=$(wildcard Source/*.cpp)
-DIABLO_OBJ=$(DIABLO_SRC:.cpp=.o)
-
-PKWARE_SRC=$(wildcard 3rdParty/PKWare/*.cpp)
-PKWARE_OBJ=$(PKWARE_SRC:.cpp=.o)
-
-all: devilution.exe
-
-devilution.exe: $(DIABLO_OBJ) $(PKWARE_OBJ) diabloui.lib storm.lib
-	mingw32-gcc -L./ -o $@ $^ -lgdi32 -lversion -ldiabloui -lstorm
-
-%.o: %.cpp
-	mingw32-gcc -c -fpermissive -Wno-write-strings -o $@ $<
-
-diabloui.lib: diabloui.dll DiabloUI/diabloui_gcc.def
-	dlltool -d DiabloUI/diabloui_gcc.def -D diabloui.dll -l diabloui.lib
-
-diabloui.dll:
-	echo "Please copy diabloui.dll (version 1.09b) here."
-
-storm.lib: storm.dll 3rdParty/Storm/Source/storm_gcc.def
-	dlltool -d 3rdParty/Storm/Source/storm_gcc.def -D storm.dll -l storm.lib
-
-storm.dll:
-	echo "Please copy storm.dll (version 1.09b) here."
-
-clean:
-	rm -f $(DIABLO_OBJ) $(PKWARE_OBJ)
-
-.PHONY: clean all

README.md

@@ -28,7 +28,7 @@ Building with Visual C++ 5.10
 
 Building with MinGW(32/64)
 - Ensure that the MinGW binary paths have been added to the command line.
-- For MinGW32, navigate to the project root and execute `mingw32-make -f Makefile32`. The process will take longer than Visual Studio.
+- For MinGW32, navigate to the project root and execute `make MINGW32=mingw32`. The process will take longer than Visual Studio.
 - For MinGW64, refer to the respective documentation: [Linux](Support/INSTALL_linux.md) | [Windows](Support/INSTALL_windows.md). Note that only x86 systems may be targeted for the time being.
 
 Compiling Definitions

Source/objs.mak

@@ -0,0 +1,70 @@
+OBJS=Source/path.o \
+     Source/monster.o \
+     Source/engine.o \
+     Source/world.o \
+     Source/help.o \
+     Source/interfac.o \
+     Source/effects.o \
+     Source/towners.o \
+     Source/gendung.o \
+     Source/sound.o \
+     Source/sha.o \
+     Source/dead.o \
+     Source/multi.o \
+     Source/items.o \
+     Source/drlg_l2.o \
+     Source/codec.o \
+     Source/pfile.o \
+     Source/drlg_l4.o \
+     Source/gamemenu.o \
+     Source/appfat.o \
+     Source/error.o \
+     Source/restrict.o \
+     Source/player.o \
+     Source/capture.o \
+     Source/mpqapi.o \
+     Source/nthread.o \
+     Source/setmaps.o \
+     Source/trigs.o \
+     Source/diablo.o \
+     Source/dx.o \
+     Source/portal.o \
+     Source/msgcmd.o \
+     Source/plrmsg.o \
+     Source/themes.o \
+     Source/control.o \
+     Source/doom.o \
+     Source/init.o \
+     Source/cursor.o \
+     Source/debug.o \
+     Source/pack.o \
+     Source/stores.o \
+     Source/msg.o \
+     Source/loadsave.o \
+     Source/objects.o \
+     Source/palette.o \
+     Source/quests.o \
+     Source/wave.o \
+     Source/tmsg.o \
+     Source/minitext.o \
+     Source/scrollrt.o \
+     Source/sync.o \
+     Source/missiles.o \
+     Source/gmenu.o \
+     Source/town.o \
+     Source/dthread.o \
+     Source/logging.o \
+     Source/textdat.o \
+     Source/lighting.o \
+     Source/automap.o \
+     Source/inv.o \
+     Source/drlg_l1.o \
+     Source/spells.o \
+     Source/encrypt.o \
+     Source/fault.o \
+     Source/track.o \
+     Source/movie.o \
+     Source/drlg_l3.o \
+     Source/mainmenu.o
+
+-include *.d

Support/INSTALL_linux.md

@@ -2,9 +2,9 @@
 
 ## Dependencies
 
-Arch Linux:
+Arch Linux
 ```bash
-pacman -Sy mingw-w64-gcc mingw-w64-binutils
+pacman -S mingw-w64-gcc mingw-w64-binutils
 ```
 
 ## Building
@@ -17,6 +17,9 @@ cp /path/to/diablo_game_dir/storm.dll .
 make
 ```
 
+On a 32-bit host, `$ make MINGW32=mingw32` should be used, to specify the 32-bit
+toolchain.
+
 ## Install
 
 ```bash