Support compiling for windows via MSVC

- Add build system configuration for MSVC
- Replace gcc-specific attributes/builtins with macros
- Add dummy members to empty structs
- Replace ranged case statements (... syntax) with explict enumeration
- Replace variable-length arrays with constant-length
- Add alternate declarations of DIP macros, which require different
  varargs syntax
- Inline a couple of __func__ references with the actual name of the
  current function
- host_generic_regs.c: use memset to initial RRegUniverse
- tilegx: replace a couple instances of very strange syntax I don't
  fully understand
- When defining host-specific macros, use _WIN32 and _WIN64 to
  additionally detect x86/x64 platforms (TODO: handle ARM windows)

.gitignore

@@ -3,6 +3,7 @@
 *.so
 *.lib
 *.dll
+*.exe
 vex
 
 auxprogs/genoffsets

Makefile-msvc

@@ -0,0 +1,50 @@
+!include common.mk
+
+##
+## Step 1: A bunch of defines
+##
+
+!if "$(MULTIARCH)" == "1"
+LIB_OBJS = $(NORMAL_OBJS) $(MULTIARCH_OBJS)
+!else
+LIB_OBJS = $(NORMAL_OBJS) $(MULTIARCH_OBJS)
+!endif
+
+CC = cl
+CC_NATIVE = cl
+AR = lib
+RM = del /F
+
+STATIC_LIBRARY_FILE = libvex.lib
+DYNAMIC_LIBRARY_FILE = libvex.dll
+EXTRA_CLEAN_FILES = auxprogs/genoffsets.exe genoffsets.obj
+
+CCFLAGS = /Ipub /Ipriv $(EXTRA_CFLAGS) /O2 /wd4715
+
+all: vex
+
+$(STATIC_LIBRARY_FILE): $(LIB_OBJS)
+	$(AR) -OUT:libvex.lib $(LIB_OBJS)
+
+$(DYNAMIC_LIBRARY_FILE): $(LIB_OBJS)
+	@echo "Currently, we don't build libvex.dll."
+	@echo "Doing so would require assembling a list of export symbols."
+
+
+pub\libvex_guest_offsets.h: $(PUB_HEADERS) auxprogs/genoffsets.c
+	$(CC_NATIVE) $(CCFLAGS) auxprogs\genoffsets.c \
+		/Fo:auxprogs\genoffsets.o /Fe:auxprogs\genoffsets.exe
+	auxprogs\genoffsets.exe > pub\libvex_guest_offsets.h
+
+.SUFFIXES: .o .c
+.c.o:
+	$(CC) /Fo:$@ -c $< $(CCFLAGS)
+
+scratch: clean all
+
+vex: $(STATIC_LIBRARY_FILE) $(DYNAMIC_LIBRARY_FILE) $(GEN_HEADERS:/=\)
+
+clean:
+	$(RM) $(GEN_HEADERS:/=\) $(NORMAL_OBJS:/=\) $(SINGLEARCH_OBJS:/=\) $(MULTIARCH_OBJS:/=\) \
+		$(STATIC_LIBRARY_FILE:/=\) $(DYNAMIC_LIBRARY_FILE:/=\) \
+		$(EXTRA_CLEAN_FILES:/=\)

common.mk

@@ -3,9 +3,6 @@
 # - EXTRA_CFLAGS: exactly what it says on the tin
 # - DEBUG: set to 1 to disable optimization and enable debug symbols
 
-# initial target - result of running 'make'
-all: vex
-
 # These headers are autogenerated
 GEN_HEADERS = pub/libvex_guest_offsets.h