support enable rpath in each target independently

Author: wangkirin

config.example.toml

@@ -750,6 +750,10 @@ changelog-seen = 2
 # This option will override the same option under [build] section.
 #profiler = build.profiler (bool)
 
+# This option supports enable `rpath` in each target independently, 
+# and will override the same option under [rust] section. It only works on Unix platforms
+#rpath = rust.rpath (bool)
+
 # Force static or dynamic linkage of the standard library for this target. If
 # this target is a host for rustc, this will also affect the linkage of the
 # compiler itself. This is useful for building rustc on targets that normally

src/bootstrap/builder.rs

@@ -1610,7 +1610,7 @@ impl<'a> Builder<'a> {
         // argument manually via `-C link-args=-Wl,-rpath,...`. Plus isn't it
         // fun to pass a flag to a tool to pass a flag to pass a flag to a tool
         // to change a flag in a binary?
-        if self.config.rust_rpath && util::use_host_linker(target) {
+        if self.config.rpath_enabled(target) && util::use_host_linker(target) {
             let rpath = if target.contains("apple") {
                 // Note that we need to take one extra step on macOS to also pass
                 // `-Wl,-instal_name,@rpath/...` to get things to work right. To

src/bootstrap/config.rs

@@ -455,6 +455,7 @@ pub struct Target {
     pub ndk: Option<PathBuf>,
     pub sanitizers: Option<bool>,
     pub profiler: Option<bool>,
+    pub rpath: Option<bool>,
     pub crt_static: Option<bool>,
     pub musl_root: Option<PathBuf>,
     pub musl_libdir: Option<PathBuf>,
@@ -800,6 +801,7 @@ define_config! {
         android_ndk: Option<String> = "android-ndk",
         sanitizers: Option<bool> = "sanitizers",
         profiler: Option<bool> = "profiler",
+        rpath: Option<bool> = "rpath",
         crt_static: Option<bool> = "crt-static",
         musl_root: Option<String> = "musl-root",
         musl_libdir: Option<String> = "musl-libdir",
@@ -1301,6 +1303,7 @@ impl Config {
                 target.qemu_rootfs = cfg.qemu_rootfs.map(PathBuf::from);
                 target.sanitizers = cfg.sanitizers;
                 target.profiler = cfg.profiler;
+                target.rpath = cfg.rpath;
 
                 config.target_config.insert(TargetSelection::from_user(&triple), target);
             }
@@ -1610,6 +1613,10 @@ impl Config {
         self.target_config.values().any(|t| t.profiler == Some(true)) || self.profiler
     }
 
+    pub fn rpath_enabled(&self, target: TargetSelection) -> bool {
+        self.target_config.get(&target).map(|t| t.rpath).flatten().unwrap_or(self.rust_rpath)
+    }
+
     pub fn llvm_enabled(&self) -> bool {
         self.rust_codegen_backends.contains(&INTERNER.intern_str("llvm"))
     }