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

[Anchu Rajendran S via flang-commits]

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@@ -995,7 +995,9 @@ void CodeGenAction::runOptimizationPipeline(llvm::raw_pwrite_stream &os) {
 
   // Create the pass manager.
   llvm::ModulePassManager mpm;
-  if (opts.PrepareForFullLTO)
+  if (opts.PrepareForFatLTO)
+    mpm = pb.buildFatLTODefaultPipeline(level, opts.PrepareForThinLTO, true);
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anchuraj wrote:

Sure. Thank you for pointing this out. I have made it consistent with the clang info. However, no summary block is emitted in any case in flang; even in case of Full LTO. 
flang -fc1 -triple x86_64-unknown-linux-gnu -flto -emit-llvm-bc hello.f90 -o -| llvm-bcanalyzer -dump
does not have FULL_LTO_GLOBALVAL_SUMMARY_BLOCK where as,
clang -cc1 -triple x86_64-unknown-linux-gnu -flto -emit-llvm-bc hello.c -o -| llvm-bcanalyzer -dump
has. 

I will work on enabling summary block for fatlto as a follow up
 

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