ESP32 build failing for env vars ARDUINO_HOST_OS, ARDUINO_VARIANT, and ARDUINO_FQBN

[RogerParkinson]

When compiling a Blink test for ESP32 I get some errors that look like env vars not defined. It looks like this:

Starting C++ compile
"/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/tools/esp-x32/2302/bin/xtensa-esp32-elf-g++" -MMD -c "@/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-33fbade6/esp32/flags/cpp_flags" -w -Os -Werror=return-type -DF_CPU=240000000L -DARDUINO=10812 -DARDUINO_ESP32_DEV -DARDUINO_ARCH_ESP32 "-DARDUINO_BOARD=\"ESP32_DEV\"" -DARDUINO_VARIANT="esp32" -DARDUINO_PARTITION_default -DARDUINO_HOST_OS="" -DARDUINO_FQBN="" -DESP32 -DCORE_DEBUG_LEVEL=0 -DARDUINO_RUNNING_CORE=1 -DARDUINO_EVENT_RUNNING_CORE=1  -DARDUINO_USB_CDC_ON_BOOT=0  "@/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-33fbade6/esp32/flags/defines" "-I/home/roger/Documents/sloeber-workspace/testesp32" -iprefix "/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-33fbade6/esp32/include/" "@/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-33fbade6/esp32/flags/includes" "-I/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-33fbade6/esp32/qio_qspi/include" -I"/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/hardware/esp32/3.0.5/variants/esp32" -I"/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/hardware/esp32/3.0.5/cores/esp32" -MMD -MP -MF"core/core/chip-debug-report.cpp.d" -MT"core/core/chip-debug-report.cpp.o" -D__IN_ECLIPSE__=1 "@/home/roger/Documents/sloeber-workspace/testesp32/Release/file_opts" "/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/hardware/esp32/3.0.5/cores/esp32/chip-debug-report.cpp" -o "core/core/chip-debug-report.cpp.o"
/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/hardware/esp32/3.0.5/cores/esp32/chip-debug-report.cpp: In function 'void printSoftwareInfo()':
/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/hardware/esp32/3.0.5/cores/esp32/chip-debug-report.cpp:211:67: error: expected primary-expression before ')' token
  211 |   chip_report_printf("  Compile Host OS   : %s\n", ARDUINO_HOST_OS);
      |                                                                   ^
/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/hardware/esp32/3.0.5/cores/esp32/chip-debug-report.cpp: In function 'void printBoardInfo()':
<command-line>: error: 'esp32' was not declared in this scope
/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/hardware/esp32/3.0.5/cores/esp32/chip-debug-report.cpp:221:52: note: in expansion of macro 'ARDUINO_VARIANT'
  221 |   chip_report_printf("  Arduino Variant   : %s\n", ARDUINO_VARIANT);
      |                                                    ^~~~~~~~~~~~~~~
/home/roger/bin/Sloeber/arduinoPlugin/packages/esp32/hardware/esp32/3.0.5/cores/esp32/chip-debug-report.cpp:223:64: error: expected primary-expression before ')' token
  223 |   chip_report_printf("  Arduino FQBN      : %s\n", ARDUINO_FQBN);

So I am trying to work out where ARDUINO_HOST_OS, ARDUINO_VARIANT, and ARDUINO_FQBN ought to be defined (and why they aren't there already).

I'm running Sloeber 4.4.3 on Xubuntu 24.04.1 LTS x86_64 and the same program builds and flashes fine using Arduino IDE 2.3.3 using the same settings for the board.

Thanks for any help

[jantje]

I guess this is a duplicate of #1649 which contains a workaround.

[RogerParkinson]

It does look the same. The workaround is not working for me atm but I see it is being worked on. I'll see if #1688 fixes it.

[jantje]

The workaround should work if it is properly executed. See #1533

[RogerParkinson]

Seems to be working. Thanks for the help. Specifically this is what I did

1. located the right platform.txt. Mine was in xxx
2. edited it and changed the line starting with "build.extra_flags.esp32". I added this to the end: -DARDUINO_HOST_OS=""generic_os"" -DARDUINO_FQBN=""generic_board"" -DARDUINO_VARIANT=""adafruit_metro_esp32""
3. save & exit the editor
4. delete platform.sloeber.txt
5. start Sloeber
6. compile successfully
   My ESP32 is just an ESP32 but I see on the following lines after the one I edited there is a reference to ESP32S3 and because I have an S3 board for my next project I added the ARDUINO_VARIANT to that with adafruit_metro_esp32s3, though I haven't tested it yet.

[RogerParkinson]

Anyway, since it is working we can close this.