Add support for include folder in a project

[ivankravets]

• Describe in documentation
• Automatically add include_dir value to CPPAPTH before building

http://docs.platformio.org/en/latest/projectconf/section_platformio.html#include-dir

[ivankravets]

Resolved via ca8bc38

[ussserrr]

What is purpose of this change? I actually opened my 2-month-ago project and just can't compile it ('not found' error). Only with option include_dir = inc compilation was successful.

[ivankravets]

This is the folder which will be automatically added to CPPPATH.
Default value is include.

You rename your inc folder to include and remove that extra option

[KubaMiszcz]

I have project exported from CubeMX, and it generates Inc where it keeps .h files

after add include_dir = Inc below framework = stm32cube in platformio.ini it still throws error: src\main.c:41:10: fatal error: main.h: No such file or directory

for me making a symlink inside root projectfolder: mklink /d Include Inc (inside root) helps

it is better than rename Inc to Includes after every regenerate project in CubeMX

[ussserrr]

@KubaMiszcz you should add include_dir option below dedicated [platformio] section of platformio.ini:

...

[platformio]
include_dir = Inc

See docs for more information.
For me, I preferred to write a small python utility that automate creation and updating PlatformIO projects with CubeMX: stm32pio. It also handles Inc and Include cases.

[KubaMiszcz]

youre right, it works perfectly, I missed this [platformio] tag, but it should be more clearly marked in Docs :]