Some months ago I used the then current version of VM and the ESP8266 stuff and it basically worked.  I have been trying to update to the newer versions of both VM and ESP8266.  It has not been trouble free.

I downloaded the new 1.6.5 version of the base Arduino code and gave it the new link for the boards manager.  It downloaded the new stuff.  But VM didn't seem to be using it.  I cleared out the folder in AppData\Roaming and started over and with a lot of clicking about was able to get something that sort of works.  The problem I am seeing is there are several IntelliSense errors with a brand new test file that has no real content.

	1	IntelliSense: more than one instance of overloaded function "atexit" has 'C' linkage	47-g39819f0\cores\esp8266\Arduino.h	180	5	junk
	2	IntelliSense: cannot open source file "c_types.h"	47-g39819f0\cores\esp8266\esp8266_peri.h	24	1	junk
	3	IntelliSense: cannot open source file "ets_sys.h"	47-g39819f0\cores\esp8266\pgmspace.h	9	1	junk
	4	IntelliSense: cannot open source file "osapi.h"	47-g39819f0\cores\esp8266\pgmspace.h	10	1	junk
	5	IntelliSense: more than one instance of overloaded function "atoi" has 'C' linkage	47-g39819f0\cores\esp8266\stdlib_noniso.h	29	5	junk
	6	IntelliSense: more than one instance of overloaded function "atol" has 'C' linkage	47-g39819f0\cores\esp8266\stdlib_noniso.h	31	6	junk
	7	IntelliSense: more than one instance of overloaded function "atof" has 'C' linkage	47-g39819f0\cores\esp8266\stdlib_noniso.h	33	8	junk
 

If I double click on the errors that say "more than one instance" they disappear.  The others stay.  The missing files are in: 47-g39819f0\tools\sdk\include

The file compiles fine, as does a more useful set of files.

Any ideas what might be wrong?

Thanks

Thanks for the quick response.  I was able to try it with the new extension version.

I now with a new blank project I get the following errors:

	1	IntelliSense: more than one instance of overloaded function "atexit" has 'C' linkage	47-g39819f0\cores\esp8266\Arduino.h	180	5	test5
	2	IntelliSense: more than one instance of overloaded function "atoi" has 'C' linkage	47-g39819f0\cores\esp8266\stdlib_noniso.h	29	5	test5
	3	IntelliSense: more than one instance of overloaded function "atol" has 'C' linkage	47-g39819f0\cores\esp8266\stdlib_noniso.h	31	6	test5
	4	IntelliSense: more than one instance of overloaded function "atof" has 'C' linkage	47-g39819f0\cores\esp8266\stdlib_noniso.h	33	8	test5
 

Also, it looks like the auto clean up did not clean up three items on the toolbar, but I was able to manually delete them easily enough.

I get lots more Intellisense errors on a real project, so many they wouldn't fit in this window.  After clicking them, I am left with the following:

	1	IntelliSense: expected an identifier	cc\1.20.0-26-gb404fb9\xtensa-lx106-elf\include\c++\4.8.2\bits\stl_algobase.h	979	10	GasMeter
	2	IntelliSense: expected a ';'	cc\1.20.0-26-gb404fb9\xtensa-lx106-elf\include\c++\4.8.2\bits\stl_pair.h	293	1	GasMeter
	3	IntelliSense: first parameter of allocation function must be of type 'size_t'	cc\1.20.0-26-gb404fb9\xtensa-lx106-elf\include\c++\4.8.2\new	91	7	GasMeter
	4	IntelliSense: first parameter of allocation function must be of type 'size_t'	cc\1.20.0-26-gb404fb9\xtensa-lx106-elf\include\c++\4.8.2\new	93	7	GasMeter
	5	IntelliSense: first parameter of allocation function must be of type 'size_t'	cc\1.20.0-26-gb404fb9\xtensa-lx106-elf\include\c++\4.8.2\new	99	7	GasMeter
	6	IntelliSense: first parameter of allocation function must be of type 'size_t'	cc\1.20.0-26-gb404fb9\xtensa-lx106-elf\include\c++\4.8.2\new	101	7	GasMeter
	7	IntelliSense: first parameter of allocation function must be of type 'size_t'	cc\1.20.0-26-gb404fb9\xtensa-lx106-elf\include\c++\4.8.2\new	109	14	GasMeter
	8	IntelliSense: first parameter of allocation function must be of type 'size_t'	cc\1.20.0-26-gb404fb9\xtensa-lx106-elf\include\c++\4.8.2\new	111	14	GasMeter
 

Here is an example of what it is not happy about

void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc)
  __attribute__((__externally_visible__));
void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc)
  __attribute__((__externally_visible__));
 

This is from the file new (no extension, which might be why it is confused).

Thanks