The latest versions of Arduino IDE shifted the responsibility for precompiled libraries support to the core developers, which breaks precompiled library support in esp32 Arduino core. See https://github.com/arduino/ArduinoCore-avr/pull/52 for more details:
```
In this new version of the builder we are not doing any heuristics to find the right spot where the ldflags should be inserted (this was causing many bugs on its own); instead, we fully trust the core makers to add explicit support to precompiled libs.
```
This chage re-enables precompiled library support in the esp32 Arduino core.
Add a file named `partitions.csv` to your sketch folder and define the partitions inside. In order to not get `Sketch too big`, please select appropriate partition scheme from the board menu
* TX Flow Control and Code cleanup
* Use semaphore instead of delay
TX functionality is done.
* Use single buffer and empty queue on exit
* Fix compile issues because of LwIP code relocation
* Add temporary header to fix Azure not compiling
* Fix AsyncUDP early init
* AsyncUDP Multicast fixes
* Add source mac address and rework multicast
* Allow redefinition of default pins for Serials 1 and 2
* Update IDF to 3276a13
* Update esptool.py to 2.5.0
* Fix sketches
* Fix log level in BluetoothSetial
* fix sdmmc config
* Fix warnings in EEPROM
from @Curclamas
* remove leftover TAG in EEPROM
* Initial add of @stickbreaker i2c
* Add log_n
* fix warnings when log is off
* i2c code clean up and reorganization
* add flags to interrupt allocator
* fix sdmmc config
* Fix warnings in EEPROM
from @Curclamas
* remove leftover TAG in EEPROM
* fix errors with latest IDF
* fix debug optimization (#1365)
incorrect optimization for debugging tick markers.
* Fix some missing BT header
* Change BTSerial log calls
* Update BLE lib
* Arduino-ESP32 release management scripted (#1515)
* Calculate an absolute path for a custom partitions table (#1452)
* * Arduino-ESP32 release management scripted
(ready-to-merge)
* * secure env for espressif/arduino-esp32
* * build tests enabled
* gitter webhook enabled
* * gitter room link fixed
* better comment
* * filepaths fixed
* BT Serial adjustments
* * don't run sketch builds & tests for tagged builds
* Return false from WiFi.hostByName() if hostname is not resolved
* Free BT Memory when BT is not used
* WIFI_MODE_NULL is not supported anymore
* Select some key examples to build with PlatformIO to save some time
* Update BLE lib
* Fixed BLE lib
* Major WiFi overhaul
- auto reconnect on connection loss now works
- moved to event groups
- some code clean up and procedure optimizations
- new methods to get a more elaborate system ststus
* Add cmake tests to travis
* Add initial AsyncUDP
* Add NetBIOS lib and fix CMake includes
* Add Initial WebServer
* Fix WebServer and examples
* travis not quiting on build fail
* Try different travis build
* Update IDF to aaf1239
* Fix WPS Example
* fix script permission and add some fail tests to sketch builder
* Add missing space in WiFiClient::write(Stream &stream)
* Update BLE lib
* Update IDF to f586f5e
* Restructure Bluetooth Serial includes
* Update esptool and gen_esp32part
* Add partition scheme selection for menuconfig
* Add partition scheme selection for Arduino IDE
* Fix BLE example
* Second attempt BLE fix
* Add exceptions to PIO
* Update mDNS and LEDC
* update toolchain
* Update IDF to 1c3dd23
* Advertise the board variant for Arduino OTA
* Add generic variant definition for mDNS
* fix NodeMCU-32S .build.board property
The .build.board=xx proptery is used for generating a macro named "ARDUINO_xxx".
C macro names should never have a "-" sign.
* current: ARDUINO_NodeMCU-32S
* should be: ARDUINO_=NodeMCU_32S
* fix compiler flags to be compatible to ESP8622/Arduino
see also "fix NodeMCU-32S .build.board property" #812 (https://github.com/espressif/arduino-esp32/pull/812#issuecomment-341990261)
`-DARDUINO_BOARD={build.board}` **is missing**
* Revert "fix NodeMCU-32S .build.board property"
This reverts commit ea57b1496a2e87d3977a31a29a4cf7d63216f008.
