This allows using the arduino_pwm feature (which is translated into a
module) without the arduino module; e.g. for only using the Arduino
I/O mapping but not the Arduino API.
If module `arduino_serial_stdio` is used and `ARDUINO_UART_DEV` is `UART_UNDEF`, the STDIO is used for `Serial`. It requires that the used `stdio` backend implements `stdio_available`.
There is no clear reason why this should be configurable and causes an abstraction of USEMODULE.
The true reason is to make Kconfig easier but it seems having a variable in USEMODULE is a bit strange.
To make it possible to use an Arduino library, a new pseudomodule arduino_lib is introduced. This pseudomodule enables implicitly module arduino but avoids that a sketch is required or generated and compiled. Thus, it is possible to compile and use a package or directory with some source files from an Arduino library in RIOT applications.
Arduino is always enabling C++11 support, so sketches and libs are depending on
it. Every C++ compiler has been enabling C++11 by default for some years now.
Still, Ubuntu's avr-gcc is so **horrible** out of date, that it is not enabled
there. As a simple work around, -std=c++11 is now passed to the C++ compiler if
Arduino is used.
llvm-ar behaves weidly when creating thin archive. This only manifests
itself when using arduino sketches as these are built from the "bin"
directory.
Specifically, given a directory "m" and an object in "m/obj.o " an
invocation with CWD==m:
```
llvm-ar rcTs ../m.a obj.o
```
Will create a maformed archive. Binutils does not have any issue with this.
The following command, executed with CWD==m/.. works:
```
llvm-ar rcTs m.a m/obj.o
```
The trick used in this commit is to put the source files in a different
directory than the object files and compile from there.
Generate a module for arduino sketches in a subfolder of BINDIR.
This prevents issues when doing concurrent builds or out of tree build with
readonly sources.
Declare all generated files as `BUILDDEPS` to be re-created after
`clean` on parrallel `clean all`.
