Thats interesting:
I have 2 different versions of esp8266 toolchain installed:
1. official release 2.4.1 under
C:\Users\drs\AppData\Local\arduino15\packages\esp8266\hardware\esp8266\2.4.1\
2. daily git under 
...\ArduinoIDE\projects\hardware\esp8266com\esp8266

It seems that Visual Studio & vMicro mixing both tool chain??
When I remove the second one and make "Rescan Toolchain and Libraries" it compiles fine.
If I add the second one again and make "Rescan Toolchain and Libraries" I get above error (1st post).

It seems to be a bug in combination of new Visual Studio 15.6.5 and vMicro.
Or its something new in esp8266 toolchain because I also updated GIT recently.
What you think?


How can I revert back to Visual Studio 15.6.4 to verify the problem?

Thanks

Thanks for the help.
Further research found the problem:
The "platform.txt" of toolchain 2.4.1 is different to "platform.txt" of 2.5.0-dev ... which is git version.
Developers changed the way the files are compiled, especially "## Build the app.ld linker file" is new in platform.txt of 2.5.0-dev.
I did not recognize any problems before because platform.txt was same until I did git update of version in directory 2.

So, vMicro seems to read platform.txt from directory 2 (see above) but using toolchain from directory 1. Thats definitely wrong and causes the problems!

Can you fix to allow two versions of toolchain & libs ... and read correct platform.txt. ArduinoIDE is doing so. I can seamlessly switch between the toolchains be selecting the same board under "ESP8266 Modules v2.4.1" or under "ESP8266 Modules /esp8266com/esp8266" shown in board selection menu. BTW. vMicro has same structure and also shows me both board directories.

Thanks

Edit:
I can compile with v2.4.1 if I rename/remove platform.txt of V2.5.0-dev. BUT, its not working vice versa

Thanks,
hope for fix soon...

I tested if board renaming maybe a solution:

I renamed the "nodemcuv2.name=NodeMCU 1.0 (ESP-12E Module)" into "nodemcuv2.name=NodeMCU 1.0 (ESP-12E Module) 2.5.0-dev" in boards.txt of v2.5.0-dev and it successfully compiling with correct tool chain of v2.5.0-dev.
However, if I select the other board "NodeMCU 1.0 (ESP-12E Module)" of the other toolchain 2.4.1 it still used wrong platform.txt

Can you probably use the hook with renaming and automate this?

Thanks

Oops, sorry for late reply....I did not see your answer...
I'm not sure what you require but I have attached what I have found...
Rgds

Not yet

You might be able to sort this yourself by changing the id of the boards you are using in boards.txt of one of the packages.

You will see the boards.txt and platform.txt in the root of each package. Use the visual micro explorer > source link when hovering over a package in board manager so see the folder.

In the boards.txt the id of the board is at the start of each line and should not be referenced in any code so can safely change or duplicate.

For example you will see a group of lines in the boards.txt that describe the Generic Esp8266 module. It has a .name and a lot of other properties. All properties start with "generic.". So "generic" is the id of the generic 8266.

You can copy/clone the generic. board or you can replace the id of the current one.

Original ID

generic.name=Generic ESP8266 Module 

New ID + name change adding DEV to the name

dev_generic.name=DEV Generic ESP8266 Module 

It's a 2min job with search and replace "generic." for "dev_generic.". Does this make sense?

One of my esp boards.txt is here
C:\Users\[your 

You can add new boards.txt with slightly different name and location that gets appended to the list but the above is easier for now.