Fix "Remove src_files and remove_file"

compiler/rustc_codegen_cranelift/src/archive.rs

@@ -92,7 +92,7 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
         Ok(())
     }
 
-    fn build(mut self) {
+    fn build(mut self) -> bool {
         enum BuilderKind {
             Bsd(ar::Builder<File>),
             Gnu(ar::GnuBuilder<File>),
@@ -191,6 +191,8 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
             )
         };
 
+        let any_members = !entries.is_empty();
+
         // Add all files
         for (entry_name, data) in entries.into_iter() {
             let header = ar::Header::new(entry_name, data.len() as u64);
@@ -216,6 +218,8 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
                 self.sess.fatal(&format!("Ranlib exited with code {:?}", status.code()));
             }
         }
+
+        any_members
     }
 
     fn inject_dll_import_lib(

compiler/rustc_codegen_gcc/src/archive.rs

@@ -100,7 +100,7 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
         Ok(())
     }
 
-    fn build(mut self) {
+    fn build(mut self) -> bool {
         use std::process::Command;
 
         fn add_file_using_ar(archive: &Path, file: &Path) {
@@ -133,6 +133,8 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
             BuilderKind::Bsd(ar::Builder::new(File::create(&self.config.dst).unwrap()))
         };
 
+        let any_members = !self.entries.is_empty();
+
         // Add all files
         for (entry_name, entry) in self.entries.into_iter() {
             match entry {
@@ -193,6 +195,8 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
         if !status.success() {
             self.config.sess.fatal(&format!("Ranlib exited with code {:?}", status.code()));
         }
+
+        any_members
     }
 
     fn inject_dll_import_lib(&mut self, _lib_name: &str, _dll_imports: &[DllImport], _tmpdir: &MaybeTempDir) {

compiler/rustc_codegen_llvm/src/back/archive.rs

@@ -97,13 +97,14 @@ impl<'a> ArchiveBuilder<'a> for LlvmArchiveBuilder<'a> {
 
     /// Combine the provided files, rlibs, and native libraries into a single
     /// `Archive`.
-    fn build(mut self) {
+    fn build(mut self) -> bool {
         let kind = self.llvm_archive_kind().unwrap_or_else(|kind| {
             self.sess.fatal(&format!("Don't know how to build archive of type: {}", kind))
         });
 
-        if let Err(e) = self.build_with_llvm(kind) {
-            self.sess.fatal(&format!("failed to build archive: {}", e));
+        match self.build_with_llvm(kind) {
+            Ok(any_members) => any_members,
+            Err(e) => self.sess.fatal(&format!("failed to build archive: {}", e)),
         }
     }
 
@@ -270,7 +271,7 @@ impl<'a> LlvmArchiveBuilder<'a> {
         kind.parse().map_err(|_| kind)
     }
 
-    fn build_with_llvm(&mut self, kind: ArchiveKind) -> io::Result<()> {
+    fn build_with_llvm(&mut self, kind: ArchiveKind) -> io::Result<bool> {
         let mut additions = mem::take(&mut self.additions);
         let mut strings = Vec::new();
         let mut members = Vec::new();
@@ -353,7 +354,7 @@ impl<'a> LlvmArchiveBuilder<'a> {
                 };
                 Err(io::Error::new(io::ErrorKind::Other, msg))
             } else {
-                Ok(())
+                Ok(!members.is_empty())
             };
             for member in members {
                 llvm::LLVMRustArchiveMemberFree(member);

compiler/rustc_codegen_ssa/src/back/archive.rs

@@ -50,7 +50,7 @@ pub trait ArchiveBuilder<'a> {
     where
         F: FnMut(&str) -> bool + 'static;
 
-    fn build(self);
+    fn build(self) -> bool;
 
     fn inject_dll_import_lib(
         &mut self,

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -2503,8 +2503,9 @@ fn add_upstream_rust_crates<'a, B: ArchiveBuilder<'a>>(
             }) {
                 sess.fatal(&format!("failed to build archive from rlib: {}", e));
             }
-            archive.build();
+            if archive.build() {
                 link_upstream(&dst);
+            }
         });
     }