How to link static libraries into arduino code?

[sysizlayan]

Hardware:

Board: ESP32 Dev Module
Core Installation/update date: Manually updated every day, always using last master
IDE name: Arduino IDE
Flash Frequency: 80Mhz
Upload Speed: 921600

Description:

Hi, I am curerntly working on IOT project and I need to link BSEC library for BME680 sensor. Library link is given below.
https://www.bosch-sensortec.com/bst/products/all_products/bsec
This library is compiled for many processor architectures and ESP32 is one of them. However Arduino libraries does not contain ESP32. So I needed to link static ".a" library to my arduino sketch.
Is it possible? Where should I place the ".a" file and which files should I edit to be able link this file to my sketch.

In short, how can one link a static libraries to project?

[sysizlayan]

I have used the methods mentioned in
arduino/Arduino#4336
Changed, platform.txt and libraries required files as said in documents in BSEC.
Arduino builder is also changed to PR219 version, this allows arduino to be able link precompiled libraries.

[jttaylor86]

Where is the arduino builder saved?

[Anupam7219]

Please find simple steps for using custom build ESP32 Static lib(.a) file in Arduino IDE.

1. Open ld_libs file in “C:\Users\XXY\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.1-632e0c2a\esp32s3\flags”

2. Add your static lib file name in file (Example: Hellolib)

3. Copy custom buid external lib file in “C:\Users\XYZ\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.1-632e0c2a\esp32s3\lib” location.

Build project from IDE.