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Fix environ on FreeBSD with cdylib targets that use -Wl,--no-undefined . #153718

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rust-bors merged 1 commit into from
Mar 23, 2026
+18 −1
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Fix environ on FreeBSD with cdylib targets that use -Wl,--no-undefined . #153718

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19 changes: 18 additions & 1 deletion library/std/src/sys/env/unix.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -38,8 +38,25 @@ pub unsafe fn environ() -> *mut *const *const c_char {
unsafe { libc::_NSGetEnviron() as *mut *const *const c_char }
}

// On FreeBSD, environ comes from CRT rather than libc
#[cfg(target_os = "freebsd")]
pub unsafe fn environ() -> *mut *const *const c_char {
use crate::sync::LazyLock;

struct Environ(*mut *const *const c_char);
unsafe impl Send for Environ {}
unsafe impl Sync for Environ {}

static ENVIRON: LazyLock<Environ> = LazyLock::new(|| {
Environ(unsafe {
libc::dlsym(libc::RTLD_DEFAULT, c"environ".as_ptr()) as *mut *const *const c_char
})
});
ENVIRON.0
}

// Use the `environ` static which is part of POSIX.
#[cfg(not(target_vendor = "apple"))]
#[cfg(not(any(target_os = "freebsd", target_vendor = "apple")))]
pub unsafe fn environ() -> *mut *const *const c_char {
unsafe extern "C" {
static mut environ: *const *const c_char;
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