================
@@ -1060,23 +1060,17 @@ void
CodeGenAction::runOptimizationPipeline(llvm::raw_pwrite_stream &os) {
if (action == BackendActionTy::Backend_EmitBC ||
action == BackendActionTy::Backend_EmitLL || opts.PrepareForFatLTO) {
- if (opts.PrepareForThinLTO) {
- // TODO: ThinLTO module summary support is yet to be enabled.
- if (action == BackendActionTy::Backend_EmitBC)
- mpm.addPass(llvm::BitcodeWriterPass(os));
- else if (action == BackendActionTy::Backend_EmitLL)
- mpm.addPass(llvm::PrintModulePass(os));
- } else {
+ if (!opts.PrepareForThinLTO)
----------------
kkwli wrote:
This is basically the original logic. It emits `!3 = !{i32 1, !"ThinLTO", i32
0}` when <u>not</u> `-flto=thin` is specified. In this case, "ThinLTO" is set
to off. This particular behavior is the same as what clang has:
```
$ build/bin/clang -S -emit-llvm -flto -o - main.c | grep LTO
!4 = !{i32 1, !"ThinLTO", i32 0}
!5 = !{i32 1, !"EnableSplitLTOUnit", i32 1}
^0 = module: (path: "[Regular LTO]", hash: (0, 0, 0, 0, 0))
$ build/bin/clang -S -emit-llvm -flto=thin -o - main.c | grep LTO
!4 = !{i32 1, !"EnableSplitLTOUnit", i32 0}
^0 = module: (path: "[Regular LTO]", hash: (0, 0, 0, 0, 0))
```
I add a comment to clarify it.
https://github.com/llvm/llvm-project/pull/195999
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