Add tools/sethost.sh. This is a script that you can use to quickly change the host platform from Linux to Windows/Cygwin. Might save you a lot of headaches.

README.txt

@@ -15,6 +15,7 @@ README
     - NuttX Configuration Tool
     - Finding Selections in the Configuration Menus
     - Reveal Hidden Configuration Options
+    - Make Sure that You on on the Right Platform
     - Comparing Two Configurations
     - Incompatibilities with Older Configurations
     - NuttX Configuration Tool under DOS
@@ -576,6 +577,38 @@ Reveal Hidden Configuration Options
   cannot be selected and has no value).  About all you do is to select
   the <Help> option to see what the dependencies are.
 
+Make Sure that You on on the Right Platform
+-------------------------------------------
+
+  Saved configurations may run on Linux, Cygwin (32- or 64-bit), or other
+  platforms.  The platform characteristics can be changed use 'make
+  menuconfig'.  Sometimes this can be confusing due to the differences
+  between the platforms.  Enter sethost.sh
+
+  sethost.sh is a simple script that changes a configuration to your
+  host platform.  This can greatly simplify life if you use many different
+  configurations.  For example, if you are running on Linux and you
+  configure like this:
+
+    $ cd tools
+    $ ./configure.sh board/configuration
+    $ cd ..
+
+  The you can use the following command to both (1) make sure that the
+  configuration is up to date, AND (2) the configuration is set up
+  correctly for Linux:
+
+    $ tools/sethost.sh -l
+
+  Or, if you are on a Windows/Cygwin 64-bit platform:
+
+    $ tools/sethost.sh -w
+
+  Other options are available from the help option built into the
+  script.  You can see all options with:
+
+    $ tools/sethost.sh -h
+
 Comparing Two Configurations
 ----------------------------
 

tools/README.txt

@@ -585,6 +585,47 @@ indent.sh
     -h
       Show this help message and exit
 
+sethost.sh
+----------
+
+  Saved configurations may run on Linux, Cygwin (32- or 64-bit), or other
+  platforms.  The platform characteristics can be changed use 'make
+  menuconfig'.  Sometimes this can be confusing due to the differences
+  between the platforms.  Enter sethost.sh
+
+  sethost.sh is a simple script that changes a configuration to your
+  host platform.  This can greatly simplify life if you use many different
+  configurations.  For example, if you are running on Linux and you
+  configure like this:
+
+    $ cd tools
+    $ ./configure.sh board/configuration
+    $ cd ..
+
+  The you can use the following command to both (1) make sure that the
+  configuration is up to date, AND (2) the configuration is set up
+  correctly for Linux:
+
+    $ tools/sethost.sh -l
+
+  Or, if you are on a Windows/Cygwin 64-bit platform:
+
+    $ tools/sethost.sh -w
+
+  Other options are available:
+
+    $ tools/sethost.sh -h
+
+    USAGE: tools/sethost.sh [-w|l] [-c|n] [-32|64] [<config>]
+           tools/sethost.sh -h
+
+    Where:
+      -w|l selects Windows (w) or Linux (l).  Default: Linux
+      -c|n selects Windows native (n) or Cygwin (c).  Default Cygwin
+      -32|64 selects 32- or 64-bit host (Only for Cygwin).  Default 64
+      -h will show this help test and terminate
+
+
 refresh.sh
 ----------
 

tools/sethost.sh

@@ -0,0 +1,232 @@
+#!/bin/bash
+# tools/sethost.sh
+#
+#   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+WD=$PWD
+
+progname=$0
+host=linux
+wenv=cygwin
+hsize=64
+unset configfile
+
+function showusage {
+    echo ""
+    echo "USAGE: $progname [-w|l] [-c|n] [-32|64] [<config>]"
+    echo "       $progname -h"
+    echo ""
+    echo "Where:"
+    echo "  -w|l selects Windows (w) or Linux (l).  Default: Linux"
+    echo "  -c|n selects Windows native (n) or Cygwin (c).  Default Cygwin"
+    echo "  -32|64 selects 32- or 64-bit host (Only for Cygwin).  Default 64"
+    echo "  -h will show this help test and terminate"
+    echo "  <config> selects configuration file.  Default: .config"
+    exit 1
+}
+
+# Parse command line
+
+while [ ! -z "$1" ]; do
+    case $1 in
+    -w )
+    host=windows
+    ;;
+    -l )
+    host=linux
+    ;;
+    -c )
+    wenv=cygwin
+    ;;
+    -n )
+    wenv=native
+    ;;
+    -32 )
+    hsize=32
+    ;;
+    -64 )
+    hsize=32
+    ;;
+    -h )
+    showusage
+    ;;
+    * )
+    configfile="$1"
+    shift
+    break;
+    ;;
+  esac
+  shift
+done
+
+if [ ! -z "$1" ]; then
+   echo "ERROR: Garbage at the end of line"
+   showusage
+fi
+
+if [ -x sethost.sh ]; then
+  nuttx=$PWD/..
+else
+  if [ -x tools/sethost.sh ]; then
+    nuttx=$PWD
+  else
+    echo "This script must be execute in nuttx/ or nutts/tools directories"
+    exit 1
+  fi
+fi
+
+rm -f $nuttx/SAVEconfig
+rm -f $nuttx/SAVEMake.defs
+
+unset dotconfig
+if [ -z "$configfile" ]; then
+  dotconfig=y
+else
+  if [ "X$configfile" = "X.config"]; then
+    dotconfig=y
+  else
+    if [ "X$configfile" = "X$nuttx/.config"]; then
+      dotconfig=y
+    fi
+  fi
+fi
+
+if [ "X$dotconfig" = "Xy" ]; then
+  unset configfile
+  if [ -r $nuttx/.config ]; then
+    configfile=$nuttx/.config
+  else
+    echo "There is no .config at $nuttx"
+    exit 1
+  fi
+
+  if [ ! -r $nuttx/Make.defs ]; then
+    echo "ERROR: No readable Make.defs file exists at $nuttx"
+    exit 1
+  fi
+else
+  if [ ! -r "$configfile" ]; then
+    echo "ERROR: No readable configuration file exists at $configfile"
+    exit 1
+  fi
+
+  configdir=`dirname $configfile`
+  makedefs=$configdir/Make.defs
+
+  if [ ! -r $makedefs]; then
+    echo "ERROR: No readable Make.defs file exists at $configdir"
+    exit 1
+  fi
+
+  if [ -f $nuttx/.config]; then
+    mv $nuttx/.config $nuttx/SAVEconfig
+  fi
+  cp $configfile $nuttx/.config || \
+    { echo "ERROR: cp to $nuttx/.config failed"; exit 1; }
+
+  if [ -f $nuttx/Make.defs]; then
+    mv $nuttx/Make.defs $nuttx/SAVEMake.defs
+  fi
+  cp $makedefs $nuttx/Make.defs || \
+    { echo "ERROR: cp to $nuttx/Make.defs failed"; exit 1; }
+fi
+
+# Modify the configuration
+
+if [ "X$host" == "Xlinux" ]; then
+    echo "  Select CONFIG_HOST_LINUX=y"
+
+    kconfig-tweak --file $nuttx/.config --enable CONFIG_HOST_LINUX
+    kconfig-tweak --file $nuttx/.config --disable CONFIG_HOST_WINDOWS
+
+    kconfig-tweak --file $nuttx/.config --disable CONFIG_WINDOWS_NATIVE
+    kconfig-tweak --file $nuttx/.config --disable CONFIG_WINDOWS_CYGWIN
+    kconfig-tweak --file $nuttx/.config --disable CONFIG_WINDOWS_MSYS
+    kconfig-tweak --file $nuttx/.config --disable CONFIG_WINDOWS_OTHER
+
+    kconfig-tweak --file $nuttx/.config --enable CONFIG_SIM_X8664_SYSTEMV
+    kconfig-tweak --file $nuttx/.config --disable CONFIG_SIM_X8664_MICROSOFT
+    kconfig-tweak --file $nuttx/.config --disable CONFIG_SIM_M32
+else
+    echo "  Select CONFIG_HOST_WINDOWS=y"
+    kconfig-tweak --file $nuttx/.config --enable CONFIG_HOST_WINDOWS
+    kconfig-tweak --file $nuttx/.config --disable CONFIG_HOST_LINUX
+
+    if [ "X$wenv" == "Xcygwin" ]; then
+      echo "  Select CONFIG_WINDOWS_CYGWIN=y"
+      kconfig-tweak --file $nuttx/.config --enable CONFIG_WINDOWS_CYGWIN
+      kconfig-tweak --file $nuttx/.config --disable CONFIG_WINDOWS_NATIVE
+    else
+      echo "  Select CONFIG_WINDOWS_NATIVE=y"
+      kconfig-tweak --file $nuttx/.config --enable CONFIG_WINDOWS_NATIVE
+      kconfig-tweak --file $nuttx/.config --disable CONFIG_WINDOWS_CYGWIN
+    fi
+
+    kconfig-tweak --file $nuttx/.config --disable CONFIG_WINDOWS_MSYS
+    kconfig-tweak --file $nuttx/.config --disable CONFIG_WINDOWS_OTHER
+
+    kconfig-tweak --file $nuttx/.config --enable CONFIG_SIM_X8664_MICROSOFT
+    kconfig-tweak --file $nuttx/.config --disable CONFIG_SIM_X8664_SYSTEMV
+
+    if [ "X$hsize" == "X32" ]; then
+      kconfig-tweak --file $nuttx/.config --enable CONFIG_SIM_M32
+    else
+      kconfig-tweak --file $nuttx/.config --disable CONFIG_SIM_M32
+    fi
+fi
+
+kconfig-tweak --file $nuttx/.config --disable CONFIG_HOST_OSX
+kconfig-tweak --file $nuttx/.config --disable CONFIG_HOST_OTHER
+
+echo "  Refreshing..."
+cd $nuttx || { echo "ERROR: failed to cd to $nuttx"; exit 1; }
+make clean_context 1>/dev/null 2>&1
+make olddefconfig 1>/dev/null 2>&1
+
+# Restore any previous .config and Make.defs files
+
+if [ "X$dotconfig" != "Xy" ]; then
+  sed -i -e "s/^CONFIG_APPS_DIR/# CONFIG_APPS_DIR/g" .config
+
+  mv .config $configfile || \
+      { echo "ERROR: Failed to move .conig to $configfile"; exit 1; }
+
+  if [ -e SAVEconfig ]; then
+    mv SAVEconfig .config || \
+      { echo "ERROR: Failed to move SAVEconfig to .config"; exit 1; }
+  fi
+
+  if [ -e SAVEMake.defs ]; then
+    mv SAVEMake.defs Make.defs || \
+      { echo "ERROR: Failed to move SAVEMake.defs to Make.defs"; exit 1; }
+  fi
+fi

tools/testbuild.sh

@@ -116,13 +116,11 @@ fi
 
 if [ ! -r "$testfile" ]; then
     echo "ERROR: No readable file exists at $testfile"
-    echo $USAGE
     showusage
 fi
 
 if [ ! -d "$nuttx" ]; then
     echo "ERROR: Expected to find nuttx/ at $nuttx"
-    echo $USAGE
     showusage
 fi