build directory can now be renamed

The autogenerated header files have been moved about, and an extra
include dir has been added, which means you can give a custom
BUILD=newbuilddir option to make, and everything "just works"

Also tidied up the way the different Makefiles build their include-
directory flags

py/mkrules.mk

@@ -59,10 +59,16 @@ $(BUILD)/%.pp: %.c
 # object directories (but only for existance), and the object directories
 # will be created if they don't exist.
 OBJ_DIRS = $(sort $(dir $(OBJ)))
-$(OBJ): $(PY_BUILD)/qstrdefs.generated.h | $(OBJ_DIRS)
+$(OBJ): $(HEADER_PY_BUILD)/qstrdefs.generated.h | $(OBJ_DIRS)
 $(OBJ_DIRS):
 	$(MKDIR) -p $@
 
+$(HEADER_BUILD):
+	$(MKDIR) -p $@
+
+$(HEADER_PY_BUILD):
+	$(MKDIR) -p $@
+
 ifneq ($(PROG),)
 # Build a standalone executable (unix and unix-cpy do this)
 

py/py.mk

@@ -1,8 +1,13 @@
 # where py object files go (they have a name prefix to prevent filename clashes)
 PY_BUILD = $(BUILD)/py
 
-# file containing qstr defs for the core Python bit
+# where autogenerated header files go
+HEADER_BUILD = $(BUILD)/includes/build
 
+# where autogenerated py header files go
+HEADER_PY_BUILD = $(HEADER_BUILD)/py
+
+# file containing qstr defs for the core Python bit
 PY_QSTR_DEFS = $(PY_SRC)/qstrdefs.h
 
 # py object files
@@ -98,26 +103,25 @@ PY_O = $(addprefix $(PY_BUILD)/, $(PY_O_BASENAME))
 FORCE:
 .PHONY: FORCE
 
-$(PY_BUILD)/py-version.h: FORCE
+$(HEADER_PY_BUILD)/py-version.h: FORCE
 	$(Q)$(PY_SRC)/py-version.sh > $@.tmp
 	$(Q)if [ -f "$@" ] && cmp -s $@ $@.tmp; then rm $@.tmp; else echo "Generating $@"; mv $@.tmp $@; fi
 
 # qstr data
 
-# Adding an order only dependency on $(PY_BUILD) causes $(PY_BUILD) to get
+# Adding an order only dependency on $(HEADER_PY_BUILD) causes $(HEADER_PY_BUILD) to get
 # created before we run the script to generate the .h
-$(PY_BUILD)/qstrdefs.generated.h: | $(PY_BUILD)/
-$(PY_BUILD)/qstrdefs.generated.h: $(PY_QSTR_DEFS) $(QSTR_DEFS) $(PY_SRC)/makeqstrdata.py mpconfigport.h $(PY_SRC)/mpconfig.h
+$(HEADER_PY_BUILD)/qstrdefs.generated.h: $(PY_QSTR_DEFS) $(QSTR_DEFS) $(PY_SRC)/makeqstrdata.py mpconfigport.h $(PY_SRC)/mpconfig.h | $(HEADER_PY_BUILD)
 	$(ECHO) "makeqstrdata $(PY_QSTR_DEFS) $(QSTR_DEFS)"
-	$(CPP) $(CFLAGS) $(PY_QSTR_DEFS) -o $(PY_BUILD)/qstrdefs.preprocessed.h
-	$(Q)$(PYTHON) $(PY_SRC)/makeqstrdata.py $(PY_BUILD)/qstrdefs.preprocessed.h $(QSTR_DEFS) > $@
+	$(CPP) $(CFLAGS) $(PY_QSTR_DEFS) -o $(HEADER_PY_BUILD)/qstrdefs.preprocessed.h
+	$(Q)$(PYTHON) $(PY_SRC)/makeqstrdata.py $(HEADER_PY_BUILD)/qstrdefs.preprocessed.h $(QSTR_DEFS) > $@
 
 # We don't know which source files actually need the generated.h (since
 # it is #included from str.h). The compiler generated dependencies will cause
 # the right .o's to get recompiled if the generated.h file changes. Adding
 # an order-only dependendency to all of the .o's will cause the generated .h
 # to get built before we try to compile any of them.
-$(PY_O): | $(PY_BUILD)/qstrdefs.generated.h $(PY_BUILD)/py-version.h
+$(PY_O): | $(HEADER_PY_BUILD)/qstrdefs.generated.h $(HEADER_PY_BUILD)/py-version.h
 
 # emitters
 

py/qstr.c

@@ -60,7 +60,6 @@ const static qstr_pool_t const_pool = {
         (const byte*) "\0\0\0\0", // invalid/no qstr has empty data
         (const byte*) "\0\0\0\0", // empty qstr
 #define Q(id, str) str,
-// TODO having 'build/' here is a bit of a hack, should take config variable from Makefile
 #include "build/py/qstrdefs.generated.h"
 #undef Q
     },

py/qstr.h

@@ -8,7 +8,6 @@ enum {
     MP_QSTR_NULL = 0, // indicates invalid/no qstr
     MP_QSTR_ = 1, // the empty qstr
 #define Q(id, str) MP_QSTR_##id,
-// TODO having 'build/py.' here is a bit of a hack, should take config variable from Makefile
 #include "build/py/qstrdefs.generated.h"
 #undef Q
     MP_QSTR_number_of,