From: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Date: Thu, 16 Jan 2025 15:34:12 +0000 (+0100)
Subject: proc-macro-srv: make usage of RTLD_DEEPBIND portable
X-Git-Tag: archive/raspbian/1.85.0+dfsg2-3+rpi1^2~3
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=962efc60ba0bf679aa1c0ad3d8b42e851952d0fc;p=rustc.git

proc-macro-srv: make usage of RTLD_DEEPBIND portable

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 old hard-coded value for non-glibc environments (which might or
might not of DEEPBIND support).

Forwarded: https://github.com/rust-lang/rust/pull/135591

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

Gbp-Pq: Topic behaviour
Gbp-Pq: Name proc-macro-srv-make-usage-of-RTLD_DEEPBIND-portable.patch
---

diff --git a/src/tools/rust-analyzer/Cargo.lock b/src/tools/rust-analyzer/Cargo.lock
index 2323fdf533..9e0a24d133 100644
--- a/src/tools/rust-analyzer/Cargo.lock
+++ b/src/tools/rust-analyzer/Cargo.lock
@@ -1371,6 +1371,7 @@ version = "0.0.0"
 dependencies = [
  "expect-test",
  "intern",
+ "libc",
  "libloading",
  "memmap2",
  "object 0.33.0",
diff --git a/src/tools/rust-analyzer/crates/proc-macro-srv/Cargo.toml b/src/tools/rust-analyzer/crates/proc-macro-srv/Cargo.toml
index 9838596945..c0881b08e1 100644
--- a/src/tools/rust-analyzer/crates/proc-macro-srv/Cargo.toml
+++ b/src/tools/rust-analyzer/crates/proc-macro-srv/Cargo.toml
@@ -14,6 +14,7 @@ doctest = false
 
 [dependencies]
 object.workspace = true
+libc.workspace = true
 libloading.workspace = true
 memmap2.workspace = true
 
diff --git a/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib.rs b/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib.rs
index 26f6af84aa..4599e655f6 100644
--- a/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib.rs
+++ b/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib.rs
@@ -59,11 +59,16 @@ 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()) }
 }