rust std build failed

[yhw2003]

I use esp-rs/esp-idf-template to create the project.
MCU: esp32c6
log:

error[E0425]: cannot find value `LOCK_EX` in crate `libc`
    --> /home/esp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/pal/unix/fs.rs:1258:58
     |
1258 |         cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_EX) })?;
     |                                                          ^^^^^^^ not found in `libc`

error[E0425]: cannot find value `LOCK_SH` in crate `libc`
    --> /home/esp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/pal/unix/fs.rs:1263:58
     |
1263 |         cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_SH) })?;
     |                                                          ^^^^^^^ not found in `libc`

error[E0425]: cannot find value `LOCK_EX` in crate `libc`
    --> /home/esp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/pal/unix/fs.rs:1268:71
     |
1268 |         let result = cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_EX | libc::LOCK_NB) });
     |                                                                       ^^^^^^^ not found in `libc`

error[E0425]: cannot find value `LOCK_NB` in crate `libc`
    --> /home/esp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/pal/unix/fs.rs:1268:87
     |
1268 |         let result = cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_EX | libc::LOCK_NB) });
     |                                                                                       ^^^^^^^ not found in `libc`

error[E0425]: cannot find value `LOCK_SH` in crate `libc`
    --> /home/esp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/pal/unix/fs.rs:1279:71
     |
1279 |         let result = cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_SH | libc::LOCK_NB) });
     |                                                                       ^^^^^^^ not found in `libc`

error[E0425]: cannot find value `LOCK_NB` in crate `libc`
    --> /home/esp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/pal/unix/fs.rs:1279:87
     |
1279 |         let result = cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_SH | libc::LOCK_NB) });
     |                                                                                       ^^^^^^^ not found in `libc`

error[E0425]: cannot find value `LOCK_UN` in crate `libc`
    --> /home/esp/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/pal/unix/fs.rs:1290:58
     |
1290 |         cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_UN) })?;
     |                                                          ^^^^^^^ not found in `libc`

For more information about this error, try `rustc --explain E0425`.
error: could not compile `std` (lib) due to 7 previous errors

[ivmarkov]

This is because of this issue.
Use a slightly older nightly compiler or the esp toolchain, as described in the esp-idf-template README.

The PR in Rust STD that fixes the problem got merged today, so tomorrow's Rust nightly will have the problem fixed.