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**Step 1:**
Create hello.cpp and hello.h and add the implementation.
Example files are in lib folder.
Create ```hello.cpp``` and ```hello.h``` and add the implementation. Example in the lib folder returns the sum of two integers
**Step 2:**
Make the archive file (.a) using xtensa-esp32-elf-gcc.exe for ESP32 and use xtensa-lx106-elf-gcc for ESP8266
Make the archive file (.a) using ```xtensa-esp32-elf-gcc.exe``` for ESP32 and use ```xtensa-lx106-elf-gcc``` for ESP8266
For ESP32
```
xtensa-esp32-elf-gcc.exe -c hello.cpp -o libhello.o
xtensa-esp32-elf-ar.exe crf libhello.a libhello.o
```
Note: xtensa-esp32-elf-gcc.exe is located here if you have installed ESP32 in your arduino IDE.
Note: ```xtensa-esp32-elf-gcc.exe``` is located here if you have installed ESP32 in your arduino IDE.
You may want to add this path to system env for easy access.
```
C:\Users\<USERNAME>\AppData\Local\Arduino15\packages\esp32\tools\xtensa-esp32s2-elf-gcc\gcc8_4_0-esp-2021r2-patch3\bin\
```
Now you should have a libhello.a in the path.