This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

   This insures the common exception handler will not be
   re-entered. The handler does not support nested interrupts
   and the interrupt stack pointer and context will be overwritten
   resulting in hard to debug hardfaults.

   If all the priorities are equal the NVIC prevents the
   preemption. The startup code defaults all the priorities
   to the same value 128.

   This change safeguards in 2 ways 1) By disabling
   CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
   This will insure that all HW interrupts are at the same
   priority.

   2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
   exception will disable any interrupts during interrupt
   processing.

- nuttx in PX4/Firmware (f3cbd3c744e9224bd55597fbfae23c56ce296544): https://github.com/PX4-NuttX/nuttx/commit/98a89513060c42215e9cd14f52a7fd7dcc08dacc
    - nuttx current upstream: https://github.com/PX4-NuttX/nuttx/commit/e31e94f5bd3cf68b9ed0f010724ac9122730dd21
    - Changes: https://github.com/PX4-NuttX/nuttx/compare/98a89513060c42215e9cd14f52a7fd7dcc08dacc...e31e94f5bd3cf68b9ed0f010724ac9122730dd21

    e31e94f 2018-09-21 David Sidrane - [REJECTED] kinetis:usbdev use CONFIG_KINETIS_USBOTG_PRIO at default

to make it non-blocking and ommit opening the same
named pipe multiple times inside the same process
which seems to be not supported in cygwin.

- Environment variables for building with asan
- Docker argument for leak sanitizer
- Regex for tests to fail on sanitizer error

Signed-off-by: Lukas Woodtli <woodtli.lukas@gmail.com>

   Bring UART4 bufffer sizes in alignment with FMUv2 Telem1

- if somebody tries to use the shell with insufficient permissions he will be told so

Signed-off-by: Roman <bapstroman@gmail.com>

   - nuttx in PX4/Firmware (0a1a2025402a387cde88132c6f8d8cc7237d2e6b): https://github.com/PX4-NuttX/nuttx/commit/bf8cce85c3f9310bcff8cdd1d979270419782a6e
    - nuttx current upstream: https://github.com/PX4-NuttX/nuttx/commit/e3b5b667aee16a699ecd6605f2d2a4adc6e95c17
    - Changes: https://github.com/PX4-NuttX/nuttx/compare/bf8cce85c3f9310bcff8cdd1d979270419782a6e...e3b5b667aee16a699ecd6605f2d2a4adc6e95c17

e3b5b66 2018-08-31 Daniel Agar - [BACKPORT] Merged in dagar/nuttx/pr-stm32f7_stackcheck-upstream (pull request #714)

  Use CONFIG_ARMV7M_STACKCHECK to add the instrumentation
  for runtime stack checking

  To enable coherent runtime stack checking use the boards
  CONFIG_ARMV7M_STACKCHECK setting

Not needed anymore

Generally exit() should not be used on Posix, because it exits the whole
program instead of only the task.