specify #[panic_handler] for default_panic_handler

[publicqi]

#![no_std]
use pinocchio::{
    account_info::AccountInfo, default_allocator, default_panic_handler, program_entrypoint,
    pubkey::Pubkey, ProgramResult,
};

program_entrypoint!(process_instruction);
default_allocator!();
default_panic_handler!();

fn process_instruction(_: &Pubkey, _: &[AccountInfo], _: &[u8]) -> ProgramResult {
    Ok(())
}

[package]
name = "pinocchio-test"
version = "0.1.0"
edition = "2021"

[lib]
crate-type = ["cdylib", "lib"]

[dependencies]
pinocchio = { version = "0.7.1" }

[profile.release]
# strip = "symbols"
lto = true
opt-level = 3

This code doesn't compile now. Error message is

error: `#[panic_handler]` function required, but not found

[febo]

Did you try compiling without being #![no_std]? I think when you link the std, this change might conflict.

[febo]

Perhaps instead of modifying the existing macro, we need to add one specific for no_std:

#[macro_export]
macro_rules! nostd_panic_handler {
    () => {
        /// A panic handler for `no_std`.
        #[cfg(not(test))]
        #[no_mangle]
        #[panic_handler]
        fn custom_panic(info: &core::panic::PanicInfo<'_>) -> ! {
            if let Some(location) = info.location() {
                $crate::log::sol_log(location.file());
            }
            // Panic reporting.
            $crate::log::sol_log("** PANICKED **");
            // Never returns.
            loop {}
        }
    };
}