Where can I change the compiler optimization options of arduino nano 33 ble sense

[haoliu0027]

Dear sir or madam,

I try to change the compiler options like -01 or -02. I already go to the platform.txt both for mbed. but I find they replace the options with one variable. The details are shown as below, do you know whereI can find the compliler.mbed.cflags?

compiler.c.flags=-c {compiler.warning_flags} -g3 -nostdlib “@{compiler.mbed.defines}” “@{compiler.mbed.cflags}” {compiler.mbed.arch.define} -MMD -mcpu={build.mcu} {build.float-abi} {build.fpu}

Thanks in advance

[b707]

@haoliu0027

do you know whereI can find the compliler.mbed.cflags?

in the platform.txt or in the board.txt

[ptillisch]

Hi @haoliu0027.

@haoliu0027

do you know whereI can find the compliler.mbed.cflags?

The compiler.mbed.cflags property is defined in the board definition in the platform's boards.txt configuration file:

boards.txt

Note the @ in the "@{compiler.mbed.cflags}" argument. This syntax tells the GCC compiler to load a list of command line options from a text file at the provided path:

https://gcc.gnu.org/onlinedocs/gcc/Overall-Options.html#:~:text=some%20other%20language.-,%40file,-Read%20command-line

So if you want to change these options, then you actually need to modify the file at this path under the platform:

variants/ARDUINO_NANO33BLE/cflags.txt

(the build.variant.path property is predefined by the Arduino boards platform framework, providing the path to the board's core variant folder)