The High Resilution Timer functions are stubbed out for now.

Certain queue functions are required to compile uORB so adding
the queue.c from NuttX.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Moved posix-like functions to vcdev_posix.cpp and updated the
copyright notice.

Added test case to make sure poll unblocks when a write occurs.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

hello should have been hello_main

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

The -Ur option is not supported in gold

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

"clang-3.5 -dumpversion" returns 4.2.1 as the GCC version.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

A Ubuntu 12.04 compatible version of clang-3.4.1 can be downloaded from
http://llvm.org/releases/3.4.1/clang+llvm-3.4.1-x86_64-unknown-ubuntu12.04.tar.xz



Signed-off-by: Mark Charlebois <charlebm@gmail.com>

GCC 4.6 is too old for -std=c++11 but it supports -std=c++0x

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Modified uint32_t casts of pointers to unsigned long for portability.
It otherwise breaks on x86_64.

Added _PX4_IOC to handle the conflice between _IOC on Linux and NuttX.

Removed use of px4::ok() because it cannot be used in a thread based
implementation. Changed to use px4::AppMgr which uses ok() on ROS.

Removed up_cxxinitialize.c from Linux build.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Fixes to compile with gcc

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Use clang-3.5 if found, otherwise gcc

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

The following libs can now be built under Linux:

   lib/mathlib
   lib/geo
   lib/geo_lookup

The constants used for ROS are now shared with Linux in
px4_defines.h

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Modified code to use OS independent header file for config settings.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Use OS independent header file for config info.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Keep existing API use in code. Bind the use of the OS independent
implementation in the systemlib layer.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Calls to task_delete and task_spawn_cmd are now
px4_task_delete and px4_task_spawn_cmd respectively.

The px4_tasks.h header was added to the affected files
and incusions of nuttx/config.h were removed.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Moved checksubmodules target back to Makefile.
NuttX download still done for Linux as it would require
too much surgery to remove it.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Uncomment the following line in setup.mk and comment out the line above
to enable the Linux build.

   export PX4_TARGET_OS	 = linux

The build uses the clang compiler by default. The final bundled executable
is mainapp located in:

   Build/linux_default.build/mainapp

When you run mainapp it will provide a list of the built-in apps. You can
type in the commands to run such as:

   hello_main start

Because the Linux build is threaded and does not support tasks or processes,
it cannot call errx, exit() _exit(), etc. It also requires unique scoped
variables to test if a thread is running or if an application should exit.
The px4::AppMgr class was added in px4_app.h for this purpose. The
hello sample app demonstrates how this is used.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Moved the NuttX specific board files to makefiles/nuttx and added
a makfiles/linux directory with sample config and board files.

Created a makefiles/toolchain_native.mk file for building for Linux
with the native system compiler. GCC or clang can be used by setting
a flag in the file.

The Linux build creates an archive file and will build the tasks as
threads. Other code changes are required to support both task based
and thread based builds.

The NuttX source should not be required for the Linux build. The
target OS (NuttX or Linux) is selected by commenting out the desired
line in setup.mk

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Commander: Improved preflight check routines. Running checks on all connected sensors. Re-run checks once GCS is connected.