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**Step 1:** **Step 1:**
Create hello.cpp and hello.h and add the implementation. Create ```hello.cpp``` and ```hello.h``` and add the implementation. Example in the lib folder returns the sum of two integers
Example files are in lib folder.
**Step 2:** **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-gcc.exe -c hello.cpp -o libhello.o
xtensa-esp32-elf-ar.exe crf libhello.a 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. 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\ 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. Now you should have a libhello.a in the path.