As of 1.58.1 rustc compiles with non-LFS functions on 32-bit platforms.

Linux kernel have special 64-bit versions of some important syscalls that 32-bit programs could use if they want to access large files. In C (and glibc) there is transparent function & syscall replacement if program is compiled with -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64.
Example list of functions that should not be used and replaced with their 64-bit versions if LFS is enabled: fallocate fcntl fopen fstat fstatfs ftruncate getrlimit glob globfree lseek lstat mkstemp mmap open openat posix_fadvise posix_fallocate pread pwrite readdir setrlimit stat statfs. For example, instead of openat should be used openat64.

There are related issues:

• std: use more LFS functions on Linux #31668
• std: Use Android LFS off64_t, ftruncate64, and lseek64 #31805

But their solutions are seems incomplete.

Simplest reproducer:

$ cat main.rs fn main() {} $ rustc main.rs $ nm main |grep 'U open' U open64@GLIBC_2.1 U open@GLIBC_2.0 

As you can see there is open present which mean that there is still non-LFS compliant usage.