> ? hex$(MM.INFO(CALLTABLE))
1000023C

bin\arm-none-eabi-gcc -c -mcpu=cortex-m33 -mfloat-abi=hard -mthumb -Wall -Wno-main -ffunction-sections -O3 -fPIC -I. %1.c -o %1.o

Breakdown of the Compiler Flags:

arm-none-eabi-gcc: The compiler driver. it coordinates the preprocessor, the actual compiler, and the assembler.
-c: Compile only. This generates an object file without performing the linking stage.
-mcpu=cortex-m33: Defines the target architecture. The Cortex-M33 is the core of the RP2350 (Pico 2).
-mfloat-abi=hard: Enables the hardware floating-point unit (FPU) of the chip for calculations.
-mthumb: Generates code using the compact Thumb instruction set.
-O3: Optimization Level 3. The compiler attempts to make the code as fast as possible.
-fPIC: Position Independent Code. This is essential for CSubs because they are loaded into MMBasic RAM at varying memory addresses.
-I.: Adds the current directory (.) to the search path for header files like your PicoCFunctions.h.

Why this is important:

For MMBasic users, this command is often contained within a Batch file (.bat on Windows). The variable %1 acts as a placeholder for your C program's filename.

Note: If you were compiling for the older RP2040 (Pico 1), the flags would be -mcpu=cortex-m0plus and -mfloat-abi=soft (as the M0+ lacks a hardware FPU).
(Source: GEMINI-KI)