unix: Add FreeDos target

unix/Makefile

@@ -126,6 +126,8 @@ ifeq ($(PROG),micropython)
 SRC_C += $(BUILD)/_frozen_upip.c
 else ifeq ($(PROG),micropython_coverage)
 SRC_C += $(BUILD)/_frozen_upip.c
+else ifeq ($(PROG), micropython_freedos)
+SRC_C += $(BUILD)/_frozen_upip.c
 endif
 
 LIB_SRC_C = $(addprefix lib/,\
@@ -169,6 +171,16 @@ fast:
 minimal:
 	$(MAKE) COPT="-Os -DNDEBUG" CFLAGS_EXTRA='-DMP_CONFIGFILE="<mpconfigport_minimal.h>"' BUILD=build-minimal PROG=micropython_minimal MICROPY_PY_TIME=0 MICROPY_PY_TERMIOS=0 MICROPY_PY_SOCKET=0 MICROPY_PY_FFI=0 MICROPY_USE_READLINE=0
 
+freedos:
+	$(MAKE) \
+	CC=i586-pc-msdosdjgpp-gcc \
+	CFLAGS_EXTRA='-DMP_CONFIGFILE="<mpconfigport_freedos.h>" -DMICROPY_NLR_SETJMP -Dtgamma=gamma -DMICROPY_EMIT_X86=0 -DMICROPY_NO_ALLOCA=1 -DMICROPY_PY_USELECT=0' \
+	BUILD=build-freedos \
+	PROG=micropython_freedos \
+	MICROPY_PY_SOCKET=0 \
+	MICROPY_PY_FFI=0 \
+	MICROPY_PY_JNI=0
+
 # build an interpreter for coverage testing and do the testing
 coverage:
 	$(MAKE) COPT="-O0" CFLAGS_EXTRA='-fprofile-arcs -ftest-coverage -Wdouble-promotion -Wformat -Wmissing-declarations -Wmissing-prototypes -Wold-style-definition -Wpointer-arith -Wshadow -Wsign-compare -Wuninitialized -Wunused-parameter -DMICROPY_UNIX_COVERAGE' LDFLAGS_EXTRA='-fprofile-arcs -ftest-coverage' BUILD=build-coverage PROG=micropython_coverage

unix/mpconfigport_freedos.h

+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// options to control how MicroPython is built
+
+#include <mpconfigport.h>
+
+#undef MICROPY_STREAMS_NON_BLOCK
+#define MICROPY_STREAMS_NON_BLOCK (0)
+
+#undef MICROPY_PY_SYS_PLATFORM
+#define MICROPY_PY_SYS_PLATFORM "freedos"
+
+// djgpp dirent struct does not have d_ino field
+#define _DIRENT_HAVE_D_INO (0)