How to change the Os to O3 compilation option?

Projects Programming
1

Hi
I'm using an ESP32S3 Dev Module (N16R8), and I try to change the compilation options to speed up the execution.
With verbose option, I can see the -Os option:

Compiling sketch...
"C:\Users\fa125436\AppData\Local\Arduino15\packages\esp32\tools\esp-xs3\2302/bin/xtensa-esp32s3-elf-g++" -MMD -c "@C:\Users\fa125436\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.1-b6b4727c58\esp32s3/flags/cpp_flags" -w -Os -DF_CPU=240000000L -DARDUINO=10607 -DARDUINO_ESP32S3_DEV -DARDUINO_ARCH_ESP32 "-DARDUINO_BOARD="ESP32S3_DEV"" "-DARDUINO_VARIANT="esp32s3"" -DARDUINO_PARTITION_ "-DARDUINO_HOST_OS="windows"" "-DARDUINO_FQBN="esp32:esp32:esp32s3:UploadSpeed=921600,USBMode=hwcdc,CDCOnBoot=default,MSCOnBoot=default,DFUOnBoot=default,UploadMode=default,CPUFreq=240,FlashMode=qio,FlashSize=16M,PartitionScheme=custom,DebugLevel=none,PSRAM=opi,LoopCore=1,EventsCore=1,EraseFlash=none,JTAGAdapter=default,ZigbeeMode=default"" -DESP32 -DCORE_DEBUG_LEVEL=0 -DARDUINO_RUNNING_CORE=1 -DARDUINO_EVENT_RUNNING_CORE=1 -DBOARD_HAS_PSRAM -DARDUINO_USB_MODE=1 -DARDUINO_USB_CDC_ON_BOOT=0 -DARDUINO_USB_MSC_ON_BOOT=0 -DARDUINO_USB_DFU_ON_BOOT=0 "@C:\Users\fa125436\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.1-b6b4727c58\esp32s3/flags/defines" "-IC:\Users\fa125436\Documents\Arduino\Aidge_export_CNN_CIFAR100" -iprefix "C:\Users\fa125436\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.1-b6b4727c58\esp32s3/include/" "@C:\Users\fa125436\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.1-b6b4727c58\esp32s3/flags/includes" "-IC:\Users\fa125436\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.1-b6b4727c58\esp32s3/qio_opi/include" "-IC:\Users\fa125436\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.0.4\cores\esp32" "-IC:\Users\fa125436\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.0.4\variants\esp32s3" "@C:\Users\fa125436\AppData\Local\Temp\arduino\sketches\C07E232AB10E5D3DA20C46F53E112267/build_opt.h" "@C:\Users\fa125436\AppData\Local\Temp\arduino\sketches\C07E232AB10E5D3DA20C46F53E112267/file_opts" "C:\Users\fa125436\AppData\Local\Temp\arduino\sketches\C07E232AB10E5D3DA20C46F53E112267\sketch\Aidge_export_CNN_CIFAR100.ino.cpp" -o "C:\Users\fa125436\AppData\Local\Temp\arduino\sketches\C07E232AB10E5D3DA20C46F53E112267\sketch\Aidge_export_CNN_CIFAR100.ino.cpp.o"

I'd like to use O3 option.
I tried to change the option in the platform.txt file that is present in my folder: Arduino15\packages\esp32\hardware\esp32\3.0.4 as follows:

# EXPERIMENTAL feature: optimization flags
#  - this is alpha and may be subject to change without notice
compiler.optimization_flags=-O3
compiler.optimization_flags.release=-O3
compiler.optimization_flags.debug=-Og -g3

But the option is unchanged in the compilation status.

I tried to change a little bit one of my source files to force the compiler to compile again and not reuse already compiled files, but I don't see any change.

How can I force the option?

2

IDE 2.x (at least 2.3.3) where the changes in platform.txt or boards.txt are not picked up.

  1. Close the IDE.
    • Delete the directory C:\Users\yourUsername\AppData\Roaming\arduino-ide.
    • It might be necesary to delete the content of the cache as well; C:\Users\yourUsername\AppData\Local\Temp\arduino.
  3. Restart the IDE.

If you're still using IDE 1.x, I'm not sure. Closing and starting the IDE again might do the trick.

3

Yes, the solution was to close and rerun the IDE. Thanks.

4

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