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proc-macro-srv: make usage of RTLD_DEEPBIND portable

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the constant is wrong on some platforms (e.g., on mips64el it's 0x10, and 0x8
is RTLD_NOLOAD which makes all this functionality broken), the libc crate takes
care of those differences for us.

fallback to not setting the flag in non-glibc environments - some of them might
have support for it using a different value that we don't know about, and some
of them lack it entirely.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
This commit is contained in:
Fabian Grünbichler 2025-01-16 16:34:12 +01:00
parent 248bd511ae
commit 73fc468a8f
3 changed files with 10 additions and 3 deletions
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11
crates/proc-macro-srv/src/dylib.rs
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@ -28,11 +28,16 @@ fn load_library(file: &Utf8Path) -> Result<Library, libloading::Error> {
#[cfg(unix)]
fn load_library(file: &Utf8Path) -> Result<Library, libloading::Error> {
// not defined by POSIX, different values on mips vs other targets
#[cfg(target_env = "gnu")]
use libc::RTLD_DEEPBIND;
use libloading::os::unix::Library as UnixLibrary;
use std::os::raw::c_int;
// defined by POSIX
use libloading::os::unix::RTLD_NOW;
const RTLD_NOW: c_int = 0x00002;
const RTLD_DEEPBIND: c_int = 0x00008;
// MUSL and bionic don't have it..
#[cfg(not(target_env = "gnu"))]
const RTLD_DEEPBIND: std::os::raw::c_int = 0x0;
unsafe { UnixLibrary::open(Some(file), RTLD_NOW | RTLD_DEEPBIND).map(|lib| lib.into()) }
}