[build] Clean the windows targets

Makefile

@@ -172,46 +172,8 @@ default: $(DEFAULT)
 
 $(foreach extension,$(extensions),$(foreach executable,$(executables),$(eval $(call rules_for_targets,$(executable),$(extension)))))
 
-# Define standard compilation rules
-
-$(eval $(call rule_for, \
-  AS, %.o, %.s, \
-  $$(CC) $$(SFLAGS) -c $$< -o $$@ \
-))
-
-$(eval $(call rule_for, \
-  CC, %.o, %.c, \
-  $$(CC) $$(SFLAGS) $$(CFLAGS) -c $$< -o $$@, \
-  with_local_version \
-))
-
-$(eval $(call rule_for, \
-  CXX, %.o, %.cpp, \
-  $$(CXX) $$(SFLAGS) $$(CXXFLAGS) -c $$< -o $$@, \
-  with_local_version \
-))
-
-$(eval $(call rule_for, \
-  OCC, %.o, %.m, \
-  $$(CC) $$(SFLAGS) $$(CFLAGS) -c $$< -o $$@ \
-))
-
-ifeq ($(OS),Windows_NT)
-# Work around command-line length limit
-# On Msys2 the max command line is 32 000 characters. Our standard LD command
-# can be longer than that because we have quite a lot of object files. To work
-# around this issue, we write the object list in a "target.objs" file, and tell
-# the linker to read its arguments from this file.
-$(eval $(call rule_for, \
-  LD, %.$$(EXE), , \
-  echo $$^ > $$@.objs && $$(LD) @$$@.objs $$(LDFLAGS) -o $$@ && rm $$@.objs \
-))
-else
-$(eval $(call rule_for, \
-  LD, %.$$(EXE), , \
-  $$(LD) $$^ $$(LDFLAGS) -o $$@ \
-))
-endif
+# Load standard build rules
+include build/rules.mk
 
 .PHONY: workshop_python_emulator
 workshop_python_emulator:

build/platform.sdl.windows.mak

@@ -1,2 +1,2 @@
-TOOLCHAIN ?= windows
+TOOLCHAIN = windows
 EXE = exe

build/rules.mk

@@ -0,0 +1,45 @@
+# Define standard compilation rules
+
+$(eval $(call rule_for, \
+  AS, %.o, %.s, \
+  $$(CC) $$(SFLAGS) -c $$< -o $$@ \
+))
+
+$(eval $(call rule_for, \
+  CC, %.o, %.c, \
+  $$(CC) $$(SFLAGS) $$(CFLAGS) -c $$< -o $$@, \
+  with_local_version \
+))
+
+$(eval $(call rule_for, \
+  CXX, %.o, %.cpp, \
+  $$(CXX) $$(SFLAGS) $$(CXXFLAGS) -c $$< -o $$@, \
+  with_local_version \
+))
+
+$(eval $(call rule_for, \
+  OCC, %.o, %.m, \
+  $$(CC) $$(SFLAGS) $$(CFLAGS) -c $$< -o $$@ \
+))
+
+ifeq ($(OS),Windows_NT)
+# Work around command-line length limit
+# On Msys2 the max command line is 32 000 characters. Our standard LD command
+# can be longer than that because we have quite a lot of object files. To work
+# around this issue, we write the object list in a "target.objs" file, and tell
+# the linker to read its arguments from this file.
+$(eval $(call rule_for, \
+  LD, %.$$(EXE), , \
+  echo $$^ > $$@.objs && $$(LD) @$$@.objs $$(LDFLAGS) -o $$@ && rm $$@.objs \
+))
+else
+$(eval $(call rule_for, \
+  LD, %.$$(EXE), , \
+  $$(LD) $$^ $$(LDFLAGS) -o $$@ \
+))
+endif
+
+$(eval $(call rule_for, \
+  WINDRES, %.o, %.rc, \
+  $$(WINDRES) $$< -O coff -o $$@ \
+))

build/targets.sdl.mak

@@ -1 +0,0 @@
--include build/targets.sdl.$(MODEL).mak

build/targets.sdl.windows.mak

@@ -1,4 +0,0 @@
-$(eval $(call rule_for, \
-  WINDRES, %.o, %.rc, \
-  $$(WINDRES) $$< -O coff -o $$@ \
-))

build/toolchain.mingw.mak

@@ -1,7 +0,0 @@
-CC = gcc
-CXX = g++
-LD = g++
-EXE = exe
-
-SFLAGS += -D_USE_MATH_DEFINES
-LDFLAGS += -static -mwindows

build/toolchain.windows.mak

@@ -1,7 +1,13 @@
-CC = x86_64-w64-mingw32-gcc
-CXX = x86_64-w64-mingw32-g++
-LD = x86_64-w64-mingw32-g++
-EXE = exe
+ifeq ($(OS),Windows_NT)
+MINGW_TOOLCHAIN_PREFIX=
+else
+MINGW_TOOLCHAIN_PREFIX=x86_64-w64-mingw32-
+endif
+
+CC = $(MINGW_TOOLCHAIN_PREFIX)gcc
+CXX = $(MINGW_TOOLCHAIN_PREFIX)g++
+LD = $(MINGW_TOOLCHAIN_PREFIX)g++
+WINDRES = $(MINGW_TOOLCHAIN_PREFIX)windres
 
 SFLAGS += -D_USE_MATH_DEFINES
 LDFLAGS += -static
@@ -12,5 +18,3 @@ ifeq ($(DEBUG),0)
 # downside of not defining "-mwindows" is that you lose stdout and stderr.
 LDFLAGS += -mwindows
 endif
-
-WINDRES = x86_64-w64-mingw32-windres