btashton commented on a change in pull request #566:
URL: 
https://github.com/apache/incubator-nuttx-apps/pull/566#discussion_r563450371



##########
File path: crypto/mbedtls/Kconfig
##########
@@ -0,0 +1,25 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+menuconfig CRYPTO_MBEDTLS
+       bool "Mbed TLS Cryptography Library"
+       default n
+       ---help---
+               Enable support for Mbed TLS.
+
+if CRYPTO_MBEDTLS
+
+config MBEDTLS_VERSION
+       string "MBEDTLS Version"
+       default "2.25.0"
+
+config MBEDTLS_DEFAULT_TASK_STACKSIZE
+       int "Mbed TLS app default stack size"
+       default 8192

Review comment:
       The issue is the default stack size is only 2KB but I normally see 3-4KB 
on real hardware.  I get that the sim is probably much higher so if we kept 
this I could conditional this like the DEFAULT_TASK_STACKSIZE.  Thoughts?

##########
File path: crypto/mbedtls/Kconfig
##########
@@ -0,0 +1,25 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+menuconfig CRYPTO_MBEDTLS
+       bool "Mbed TLS Cryptography Library"
+       default n
+       ---help---
+               Enable support for Mbed TLS.
+
+if CRYPTO_MBEDTLS
+
+config MBEDTLS_VERSION
+       string "MBEDTLS Version"
+       default "2.25.0"
+
+config MBEDTLS_DEFAULT_TASK_STACKSIZE
+       int "Mbed TLS app default stack size"
+       default 8192
+
+source "$APPSDIR/crypto/mbedtls/apps/benchmark/Kconfig"
+source "$APPSDIR/crypto/mbedtls/apps/selftest/Kconfig"

Review comment:
       The Kconfigs do not use relative paths.  If you try you get an error 
like this:
   ```
   /home/bashton/nuttx/wrk/apps/crypto/mbedtls/Kconfig:23: can't open file 
"./apps/selftest/Kconfig"
   ```

##########
File path: crypto/mbedtls/apps/selftest/Makefile
##########
@@ -0,0 +1,33 @@
+############################################################################
+# apps/crypto/mbedtls/apps/selftest/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+include ../Makefile
+
+# mbedtls built-in benchmark application info
+
+PROGNAME  = "mbedselftest"
+PRIORITY  = $(CONFIG_MBEDTLS_APP_SELFTEST_PRIORITY)
+STACKSIZE = $(CONFIG_MBEDTLS_APP_SELFTEST_STACKSIZE)
+MODULE    = $(CONFIG_MBEDTLS_APP_SELFTEST)
+
+MAINSRC = $(MBEDPROGDIR)/test/selftest.c

Review comment:
       I could not get that to work, but maybe I am doing something wrong
   with:
   ```
   MAINSRC = ../../mbedtls/test/selftest.c
   ```
   I get this
   ```
   make[3]: *** No rule to make target '../../mbedtls/test/selftest.c', needed 
by 
'../../mbedtls/test/selftest.home.bashton.nuttx.wrk.apps.crypto.mbedtls.apps.selftest.o'.
  Stop.
   ```

##########
File path: crypto/mbedtls/Make.defs
##########
@@ -0,0 +1,33 @@
+############################################################################
+# apps/crypto/mbedtls/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifeq ($(CONFIG_CRYPTO_MBEDTLS),y)
+CONFIGURED_APPS += $(APPDIR)/crypto/mbedtls
+
+# Allows `<mbedtls/<>.h>` import.
+
+CFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" 
$(APPDIR)/crypto/mbedtls/mbedtls/include}
+CXXFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" 
$(APPDIR)/crypto/mbedtls/mbedtls/include}
+
+CFLAGS += -DMBEDTLS_CONFIG_FILE="<crypto/mbedtls_config.h>"

Review comment:
       Had to wrap the string in single quotes as well to get the command 
formatted correctly but seems good now.

##########
File path: crypto/mbedtls/apps/selftest/Makefile
##########
@@ -0,0 +1,33 @@
+############################################################################
+# apps/crypto/mbedtls/apps/selftest/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+include ../Makefile
+
+# mbedtls built-in benchmark application info
+
+PROGNAME  = "mbedselftest"
+PRIORITY  = $(CONFIG_MBEDTLS_APP_SELFTEST_PRIORITY)
+STACKSIZE = $(CONFIG_MBEDTLS_APP_SELFTEST_STACKSIZE)
+MODULE    = $(CONFIG_MBEDTLS_APP_SELFTEST)
+
+MAINSRC = $(MBEDPROGDIR)/test/selftest.c

Review comment:
       You cannot call `include $(APPDIR)/Application.mk` twice in the same 
make file which is they need to be in there own folders.  But I don't think 
that is related to this path issue.

##########
File path: crypto/mbedtls/apps/selftest/Makefile
##########
@@ -0,0 +1,33 @@
+############################################################################
+# apps/crypto/mbedtls/apps/selftest/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+include ../Makefile
+
+# mbedtls built-in benchmark application info
+
+PROGNAME  = "mbedselftest"
+PRIORITY  = $(CONFIG_MBEDTLS_APP_SELFTEST_PRIORITY)
+STACKSIZE = $(CONFIG_MBEDTLS_APP_SELFTEST_STACKSIZE)
+MODULE    = $(CONFIG_MBEDTLS_APP_SELFTEST)
+
+MAINSRC = $(MBEDPROGDIR)/test/selftest.c

Review comment:
       also careful with your paths.
   `crypto/mbedtls/programs/test` does not exist. 
`crypto/mbedtls/mbedtls/programs/test` does, but that is inside the downloaded 
source.

##########
File path: crypto/mbedtls/apps/selftest/Makefile
##########
@@ -0,0 +1,33 @@
+############################################################################
+# apps/crypto/mbedtls/apps/selftest/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+include ../Makefile
+
+# mbedtls built-in benchmark application info
+
+PROGNAME  = "mbedselftest"
+PRIORITY  = $(CONFIG_MBEDTLS_APP_SELFTEST_PRIORITY)
+STACKSIZE = $(CONFIG_MBEDTLS_APP_SELFTEST_STACKSIZE)
+MODULE    = $(CONFIG_MBEDTLS_APP_SELFTEST)
+
+MAINSRC = $(MBEDPROGDIR)/test/selftest.c

Review comment:
       Hmm interesting I did not realize that.  Can you take a look at how I 
set it up now.  MODULE only take a single value so I had to create a wrapper 
for all the apps to drive that, but I think it is reasonable.

##########
File path: crypto/mbedtls/Makefile
##########
@@ -0,0 +1,91 @@
+############################################################################
+# apps/crypto/mbedtls/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# Mbed TLS crypto library
+
+# Set up build configuration and environment
+
+MBEDTLS_URL ?= "https://github.com/ARMmbed/mbedtls/archive";
+
+MBEDTLS_VERSION = $(patsubst "%",%,$(strip $(CONFIG_MBEDTLS_VERSION)))
+MBEDTLS_ZIP = v$(MBEDTLS_VERSION).zip
+
+MBEDTLS_UNPACKNAME = mbedtls
+UNPACK ?= unzip -q -o
+
+MBEDTLS_UNPACKLIBDIR = $(MBEDTLS_UNPACKNAME)$(DELIM)library
+MBEDTLS_UNPACKPROGDIR = $(MBEDTLS_UNPACKNAME)$(DELIM)programs
+
+# This lets Mbed TLS better use some of the POSIX features we have
+CFLAGS += ${shell $(DEFINE) "$(CC)" __unix__}
+
+CSRCS = $(wildcard $(MBEDTLS_UNPACKLIBDIR)$(DELIM)*.c)
+
+
+$(MBEDTLS_ZIP):
+       @echo "Downloading: $(MBEDTLS_URL)/$(MBEDTLS_ZIP)"
+       $(Q) curl -O -L $(MBEDTLS_URL)/$(MBEDTLS_ZIP)
+
+$(MBEDTLS_UNPACKNAME): $(MBEDTLS_ZIP)
+       @echo "Unpacking: $(MBEDTLS_ZIP) -> $(MBEDTLS_UNPACKNAME)"
+       $(Q) $(UNPACK) $(MBEDTLS_ZIP)
+       $(Q) mv mbedtls-$(MBEDTLS_VERSION) $(MBEDTLS_UNPACKNAME)
+       $(Q) touch $(MBEDTLS_UNPACKNAME)
+
+context:: $(MBEDTLS_UNPACKNAME)
+
+distclean::
+       $(call DELDIR, $(MBEDTLS_UNPACKNAME))
+       $(call DELFILE, $(MBEDTLS_ZIP))
+
+# Configuration Applications
+
+ifneq ($(CONFIG_MBEDTLS_APPS),)
+CONFIGURED_APPS += $(APPDIR)/crypto/mbedtls/

Review comment:
       Since we already include Application.mk at the end do we even need to 
include this here since they will already be registered?

##########
File path: crypto/mbedtls/Makefile
##########
@@ -0,0 +1,91 @@
+############################################################################
+# apps/crypto/mbedtls/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# Mbed TLS crypto library
+
+# Set up build configuration and environment
+
+MBEDTLS_URL ?= "https://github.com/ARMmbed/mbedtls/archive";
+
+MBEDTLS_VERSION = $(patsubst "%",%,$(strip $(CONFIG_MBEDTLS_VERSION)))
+MBEDTLS_ZIP = v$(MBEDTLS_VERSION).zip
+
+MBEDTLS_UNPACKNAME = mbedtls
+UNPACK ?= unzip -q -o
+
+MBEDTLS_UNPACKLIBDIR = $(MBEDTLS_UNPACKNAME)$(DELIM)library
+MBEDTLS_UNPACKPROGDIR = $(MBEDTLS_UNPACKNAME)$(DELIM)programs
+
+# This lets Mbed TLS better use some of the POSIX features we have
+CFLAGS += ${shell $(DEFINE) "$(CC)" __unix__}
+
+CSRCS = $(wildcard $(MBEDTLS_UNPACKLIBDIR)$(DELIM)*.c)
+
+
+$(MBEDTLS_ZIP):
+       @echo "Downloading: $(MBEDTLS_URL)/$(MBEDTLS_ZIP)"
+       $(Q) curl -O -L $(MBEDTLS_URL)/$(MBEDTLS_ZIP)
+
+$(MBEDTLS_UNPACKNAME): $(MBEDTLS_ZIP)
+       @echo "Unpacking: $(MBEDTLS_ZIP) -> $(MBEDTLS_UNPACKNAME)"
+       $(Q) $(UNPACK) $(MBEDTLS_ZIP)
+       $(Q) mv mbedtls-$(MBEDTLS_VERSION) $(MBEDTLS_UNPACKNAME)
+       $(Q) touch $(MBEDTLS_UNPACKNAME)
+
+context:: $(MBEDTLS_UNPACKNAME)
+
+distclean::
+       $(call DELDIR, $(MBEDTLS_UNPACKNAME))
+       $(call DELFILE, $(MBEDTLS_ZIP))
+
+# Configuration Applications
+
+ifneq ($(CONFIG_MBEDTLS_APPS),)
+CONFIGURED_APPS += $(APPDIR)/crypto/mbedtls/

Review comment:
       Since we already include Application.mk at the end do we even need to 
include this at all since they will already be registered?

##########
File path: crypto/mbedtls/Kconfig
##########
@@ -0,0 +1,80 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+menuconfig CRYPTO_MBEDTLS
+       bool "Mbed TLS Cryptography Library"
+       default n
+       ---help---
+               Enable support for Mbed TLS.
+
+if CRYPTO_MBEDTLS
+
+config MBEDTLS_VERSION
+       string "MBEDTLS Version"
+       default "2.25.0"
+
+menuconfig MBEDTLS_APPS

Review comment:
       This seems wrong. The applications and the library are two separate 
things. Enabling the library should have no impact (besides dependency) on the 
applications. 

##########
File path: crypto/mbedtls/Kconfig
##########
@@ -0,0 +1,25 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+menuconfig CRYPTO_MBEDTLS
+       bool "Mbed TLS Cryptography Library"
+       default n
+       ---help---
+               Enable support for Mbed TLS.
+
+if CRYPTO_MBEDTLS
+
+config MBEDTLS_VERSION
+       string "MBEDTLS Version"
+       default "2.25.0"
+
+config MBEDTLS_DEFAULT_TASK_STACKSIZE
+       int "Mbed TLS app default stack size"
+       default 8192

Review comment:
       So what are you thinking is the right thing for some of these apps?  
DEFAULT_TASK_STACKSIZE wont work for most of them.  The an especially bad 
offender is the app for testing parsing CRL it allocates a 100KB buffer on the 
stack right away (I don't know why they don't use the heap for this...)
   
https://github.com/ARMmbed/mbedtls/blob/6fbff5b557efe661cc019ef59f42c835524e9bf2/programs/x509/crl_app.c#L75
   

##########
File path: crypto/mbedtls/Make.defs
##########
@@ -0,0 +1,32 @@
+############################################################################
+# apps/crypto/mbedtls/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifeq ($(CONFIG_CRYPTO_MBEDTLS),y)
+CONFIGURED_APPS += $(APPDIR)/crypto/mbedtls
+
+# Allows `<mbedtls/<>.h>` import.
+
+CFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" 
$(APPDIR)/crypto/mbedtls/mbedtls/include}
+CXXFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" 
$(APPDIR)/crypto/mbedtls/mbedtls/include}
+
+CFLAGS += ${shell $(DEFINE) "$(CC)" 
MBEDTLS_CONFIG_FILE='"<crypto/mbedtls_config.h>"'}

Review comment:
       My plan is to completely replace it so that it is fully hooked into the 
Kconfig, I think that will end up being cleaner for us.

##########
File path: crypto/mbedtls/Makefile
##########
@@ -0,0 +1,91 @@
+############################################################################
+# apps/crypto/mbedtls/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# Mbed TLS crypto library
+
+# Set up build configuration and environment
+
+MBEDTLS_URL ?= "https://github.com/ARMmbed/mbedtls/archive";
+
+MBEDTLS_VERSION = $(patsubst "%",%,$(strip $(CONFIG_MBEDTLS_VERSION)))
+MBEDTLS_ZIP = v$(MBEDTLS_VERSION).zip
+
+MBEDTLS_UNPACKNAME = mbedtls
+UNPACK ?= unzip -q -o
+
+MBEDTLS_UNPACKLIBDIR = $(MBEDTLS_UNPACKNAME)$(DELIM)library
+MBEDTLS_UNPACKPROGDIR = $(MBEDTLS_UNPACKNAME)$(DELIM)programs
+
+# This lets Mbed TLS better use some of the POSIX features we have
+CFLAGS += ${shell $(DEFINE) "$(CC)" __unix__}
+
+CSRCS = $(wildcard $(MBEDTLS_UNPACKLIBDIR)$(DELIM)*.c)
+
+
+$(MBEDTLS_ZIP):
+       @echo "Downloading: $(MBEDTLS_URL)/$(MBEDTLS_ZIP)"
+       $(Q) curl -O -L $(MBEDTLS_URL)/$(MBEDTLS_ZIP)
+
+$(MBEDTLS_UNPACKNAME): $(MBEDTLS_ZIP)
+       @echo "Unpacking: $(MBEDTLS_ZIP) -> $(MBEDTLS_UNPACKNAME)"
+       $(Q) $(UNPACK) $(MBEDTLS_ZIP)
+       $(Q) mv mbedtls-$(MBEDTLS_VERSION) $(MBEDTLS_UNPACKNAME)
+       $(Q) touch $(MBEDTLS_UNPACKNAME)
+
+context:: $(MBEDTLS_UNPACKNAME)
+
+distclean::
+       $(call DELDIR, $(MBEDTLS_UNPACKNAME))
+       $(call DELFILE, $(MBEDTLS_ZIP))
+
+# Configuration Applications
+
+ifneq ($(CONFIG_MBEDTLS_APPS),)
+CONFIGURED_APPS += $(APPDIR)/crypto/mbedtls/

Review comment:
       Ok, done.

##########
File path: crypto/mbedtls/Make.defs
##########
@@ -0,0 +1,32 @@
+############################################################################
+# apps/crypto/mbedtls/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifeq ($(CONFIG_CRYPTO_MBEDTLS),y)
+CONFIGURED_APPS += $(APPDIR)/crypto/mbedtls
+
+# Allows `<mbedtls/<>.h>` import.
+
+CFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" 
$(APPDIR)/crypto/mbedtls/mbedtls/include}
+CXXFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" 
$(APPDIR)/crypto/mbedtls/mbedtls/include}
+
+CFLAGS += ${shell $(DEFINE) "$(CC)" 
MBEDTLS_CONFIG_FILE='"<crypto/mbedtls_config.h>"'}

Review comment:
       Another thing I have not figured out how to do is how to get make to be 
aware that all the source files in here depend on `crypto/mbedtls_config.h`  
right now when I make change to it or to `nuttx/config.h` that drives changes 
it in they are not rebuilt.




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