Vscode-arduino: cannot open source file "omp.h" (dependency of "ESP8266WiFi.h"

[Dwarni]

I get the following error when trying to run my code which works fine if using arduino ide:

[andynabokus]

Hi! You need configure your include path in the c_cpp_properties.json file.
raw "/opt/arduino_1_8/" - includes any files in the arduino directory.
{
"configurations": [
{
"name": "Linux",
"includePath": [
"${workspaceFolder}/",
"/opt/arduino_1_8/**"
],
"defines": [],
"compilerPath": "/usr/bin/clang++-4.0",
"cStandard": "c11",
"cppStandard": "c++17",
"intelliSenseMode": "clang-x64",
"forcedInclude": []
}
],
"version": 4
}

[stale[bot]]

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[pmckinney1971]

The above reply is for an entry for the include path on a Linux machine ("/opt/arduino_1_8/**"), but don't know what the equivalent would be on a Windows machine? ... I have exactly the same error as Cictani above.

Current include path is (some of which looks redundant to me):

"includePath": [
                "C:\\Users\\Leonie\\Documents\\Arduino\\hardware\\esp8266com\\esp8266\\libraries\\ESP8266WiFi\\src",
                "C:\\Users\\Leonie\\AppData\\Local\\Arduino15\\packages\\esp8266\\tools\\**",
                "C:\\Users\\Leonie\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.5.0\\**",
                "C:\\Users\\Leonie\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.5.0\\libraries\\**",
                "C:\\Users\\Leonie\\AppData\\Local\\Arduino15\\**",
                "C:\\Users\\Leonie\\Documents\\Arduino\\hardware\\esp8266com\\esp8266\\**",
                "C:\\Users\\Leonie\\Documents\\Arduino\\libraries\\**",
                "${workspaceFolder}/**"

[oparex]

I have the same problem on a mac. I can't find the location of omp.h, I tried to find it with find in terminal, no success. It would help to know Arduino IDE's include path. Google searches on this only explain what this is, not where...

[stoonoon]

Same thing there.... I couldn't find it anywhere on my win 10 machine. A bit of googling suggested that it's part of OpenMP, which was included in gcc, but not in the xtensa-lx106-elf-gcc folder included in the esp8266 package. I installed gcc via WSL, and then found omp.h under %LOCALAPPDATA%\lxss\rootfs\usr\lib\gcc\x86_64-linux-gnu\5\include
I copied it to a new folder under Arduino\libraries\ and that error has gone.
It feels like a horrific bodge, but it's let me move on for now, so I think I can live with it....

[itdir]

Same issue...

macOS 10.14.6
VSC 1.45.1
Arduino 1.8.12

I've tried many variations of the Include path, but now I'm back to
${workspaceFolder}/*
${HOME}/Documents/Arduino/libraries/*

[luisrival]

Someone know how to fix it for windows? I have the same issue

[mitchh]

ESP8266WifiType.h (included by ESP8266WiFi.h) is finding the wrong queue.h, which is then trying to find some OpenMP headers. I fixed it on my Mac by putting the sdk include specifically before the the broad ** include paths. Here is a (redacted; everything in angle brackets has been removed/replaced. Also your version numbers may be different) snippet of my c_cpp_properties.json:

      "includePath": [
        <more stuff>
        "<my home dir>/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.2/tools/sdk/include",
        "<my home dir>/Library/Arduino15/packages/esp8266/tools/**",
        "<my home dir>/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.2/**"
      ],

The tools/** line matched:

$ find ~/Library/Arduino15/packages/esp8266/tools -iname queue.h 
<my home dir>/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/xtensa-lx106-elf/include/c++/4.8.2/parallel/queue.h
<my home dir>/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/xtensa-lx106-elf/include/sys/queue.h

...and the one of those it used tried to pull in the OpenMP stuff.

The hardware/esp8266/2.7.2/** one matched the right one (among other things):

$ find ~/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.2 -iname queue.h
<my home dir>/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.2/tools/sdk/libc/xtensa-lx106-elf/include/sys/queue.h
<my home dir>/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.2/tools/sdk/include/queue.h
<my home dir>/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.2/tests/host/common/queue.h

but a) was already too late after the tools/** line and b) still gave too many answers.

I think the ** are scary resource-wasting monsters, but I don't have (haven't looked hard enough for) a hassle free alternate solution (yet?)

[MohammedNoureldin]

OMG I am spending long time solving such issues more than coding... I have the exact same problem.

[MohammedNoureldin]

OK, it turned out that I could fix it (or work around it), by specifying the path of the compiler, just like this:

"compilerPath": "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr\\bin\\avr-gcc.exe",
"intelliSenseMode": "gcc-x64",

[jevoswang]

Create an empty omp.h by yourself, and there is a relevant path.