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From: Debian Rust Maintainers <pkg-rust-maintainers@alioth-lists.debian.net>
Date: Thu, 14 Jul 2022 13:17:38 +0200
Subject: d-bootstrap-rustflags

===================================================================
---
 src/bootstrap/builder.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Index: rust/src/bootstrap/builder.rs
===================================================================
--- rust.orig/src/bootstrap/builder.rs
+++ rust/src/bootstrap/builder.rs
@@ -1385,6 +1385,18 @@ impl<'a> Builder<'a> {
             }
         }
 
+        // Debian-specific stuff here
+        // set linker flags from LDFLAGS
+        if let Ok(ldflags) = env::var("LDFLAGS") {
+            for flag in ldflags.split_whitespace() {
+                if target.contains("windows") && flag.contains("relro") {
+                    // relro is ELF-specific
+                    continue;
+                }
+                rustflags.arg(&format!("-Clink-args={}", flag));
+            }
+        }
+
         // FIXME: It might be better to use the same value for both `RUSTFLAGS` and `RUSTDOCFLAGS`,
         // but this breaks CI. At the very least, stage0 `rustdoc` needs `--cfg bootstrap`. See
         // #71458.