MinGW: improve compatibility with LLD

src/librustc_codegen_ssa/back/linker.rs

@@ -443,8 +443,9 @@ impl<'a> Linker for GccLinker<'a> {
  return;
  }
 
+ let is_windows = self.sess.target.target.options.is_like_windows;
  let mut arg = OsString::new();
- let path = tmpdir.join("list");
+ let path = tmpdir.join(if is_windows { "list.def" } else { "list" });
 
  debug!("EXPORTED SYMBOLS:");
 
@@ -460,6 +461,21 @@ impl<'a> Linker for GccLinker<'a> {
  if let Err(e) = res {
  self.sess.fatal(&format!("failed to write lib.def file: {}", e));
  }
+ } else if is_windows {
+ let res: io::Result<()> = try {
+ let mut f = BufWriter::new(File::create(&path)?);
+
+ // .def file similar to MSVC one but without LIBRARY section
+ // because LD doesn't like when it's empty
+ writeln!(f, "EXPORTS")?;
+ for symbol in self.info.exports[&crate_type].iter() {
+ debug!(" _{}", symbol);
+ writeln!(f, " {}", symbol)?;
+ }
+ };
+ if let Err(e) = res {
+ self.sess.fatal(&format!("failed to write list.def file: {}", e));
+ }
  } else {
  // Write an LD version script
  let res: io::Result<()> = try {
@@ -493,7 +509,10 @@ impl<'a> Linker for GccLinker<'a> {
  if !self.is_ld {
  arg.push("-Wl,")
  }
- arg.push("--version-script=");
+ // Both LD and LLD accept export list in *.def file form, there are no flags required
+ if !is_windows {
+ arg.push("--version-script=")
+ }
  }
 
  arg.push(&path);