[clang] [flang] [flang][Driver] Enables lto-partitions and fat-lto-object. (PR #158125)

[Anchu Rajendran S via cfe-commits]

================
@@ -1494,8 +1484,35 @@ static bool parseLinkerOptionsArgs(CompilerInvocation 
&invoc,
     return false;
   }
 
-  invoc.getCodeGenOpts().DependentLibs =
+  opts.DependentLibs =
       args.getAllArgValues(clang::driver::options::OPT_dependent_lib);
+
+  // -flto=full/thin option.
+  if (const llvm::opt::Arg *a =
+          args.getLastArg(clang::driver::options::OPT_flto_EQ)) {
+    llvm::StringRef s = a->getValue();
+    assert((s == "full" || s == "thin") && "Unknown LTO mode.");
+    if (s == "full")
+      opts.PrepareForFullLTO = true;
+    else
+      opts.PrepareForThinLTO = true;
+  }
+
+  // -ffat-lto-objects
+  if (const llvm::opt::Arg *arg =
+          args.getLastArg(clang::driver::options::OPT_ffat_lto_objects,
+                          clang::driver::options::OPT_fno_fat_lto_objects)) {
+    opts.PrepareForFatLTO =
+        arg->getOption().matches(clang::driver::options::OPT_ffat_lto_objects);
+    if (opts.PrepareForFatLTO) {
+      assert(opts.PrepareForFullLTO || opts.PrepareForThinLTO);
----------------
anchuraj wrote:

Updated.

https://github.com/llvm/llvm-project/pull/158125
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