I am using visual micro with Arduino 1.8.5. In the Arduino IDE I can compile a sketch for STM32F103C with the USBHID_stm32f1 library. But in visual micro I cant find the library (it doesnt show up in the "add library" menu), and attempting to compile the same sketch with the same board++ in with visual micro results in a "no such file" error: 

"
midiin.ino: 2:21: fatal error: USBMIDI.h: No such file or directory
   #include <USBMIDI.h>
   compilation terminated
"

This is a library that in the Arduino IDE will not show up unless a compatible board (i.e. STM32F103C) is selected. So I guess the root of the problem might be there somewhere? How does Arduino and Visual Micro determine what libraries are allowed? Is there a quick fix that can be applied to some file in the library in question?

The correct settingfor "any board" would be architectures=*

That's the correct design for the library spec however many lib producers set the wrong architectures so the arduino ide has recently ignored the architectures setting for compilation but continues not to show the library on the ide library menus if the architecture doesn't match the current board.

Recent releases of visual micro are also supposed to ignore the architectures= during compile.

... question ...

Which version of visual micro are you using and which ide? You can see the visual micro version in tools>extensions and updates.

Which tool chain have you installed for your board (or json file path)

Is the library a standard lib if not how installed/from where?

Thanks for the great info and this report.

The issue was a case comparison issue when resolving the architecture= param.

Fixed in the next release due over the next few days

• Fix: Library architecture resolution failed for some libraries due to an incorrect string case comparison resolving architecture= for library.properties