clang: Pass -platform-version to new MachO LLD

New MachO LLD doesn't implement the old -macos_version_min (etc)
flags, but it understands the modern platform_version flag.
So make the clang driver pass that when using new MachO LLD.

Also, while here, don't pass -lto_library to LLD, since it
links in LTO libraries statically (which it can because it's
versioned alongside clang).

Differential Revision: https://reviews.llvm.org/D92037

1 files changed, 7 insertions, 2 deletions

diff --git a/clang/lib/Driver/ToolChain.cpp b/clang/lib/Driver/ToolChain.cpp
index ae1838a..0330afd 100644
--- a/clang/lib/Driver/ToolChain.cpp
+++ b/clang/lib/Driver/ToolChain.cpp
@@ -548,9 +548,12 @@ std::string ToolChain::GetProgramPath(const char *Name) const {
   return D.GetProgramPath(Name, *this);
 }
 
-std::string ToolChain::GetLinkerPath(bool *LinkerIsLLD) const {
+std::string ToolChain::GetLinkerPath(bool *LinkerIsLLD,
+                                     bool *LinkerIsLLDDarwinNew) const {
   if (LinkerIsLLD)
     *LinkerIsLLD = false;
+  if (LinkerIsLLDDarwinNew)
+    *LinkerIsLLDDarwinNew = false;
 
   // Get -fuse-ld= first to prevent -Wunused-command-line-argument. -fuse-ld= is
   // considered as the linker flavor, e.g. "bfd", "gold", or "lld".
@@ -603,9 +606,11 @@ std::string ToolChain::GetLinkerPath(bool *LinkerIsLLD) const {
 
     std::string LinkerPath(GetProgramPath(LinkerName.c_str()));
     if (llvm::sys::fs::can_execute(LinkerPath)) {
+      // FIXME: Remove lld.darwinnew here once it's the only MachO lld.
       if (LinkerIsLLD)
-        // FIXME: Remove lld.darwinnew here once it's the only MachO lld.
         *LinkerIsLLD = UseLinker == "lld" || UseLinker == "lld.darwinnew";
+      if (LinkerIsLLDDarwinNew)
+        *LinkerIsLLDDarwinNew = UseLinker == "lld.darwinnew";
       return LinkerPath;
     }
   }