[llvm] [RemoveDIs] Load into new debug info format by default in llvm-link (PR #86274)

[Orlando Cazalet-Hyams via llvm-commits]

https://github.com/OCHyams created https://github.com/llvm/llvm-project/pull/86274

Directly load all bitcode into the new debug info format in llvm-link. This means that new-mode bitcode no longer round-trips back to old-mode after parsing, and that old-mode bitcode gets auto-upgraded to new-mode debug info (which is the current in-memory default in LLVM).

>From 8a73729d21bf0661f1ceb6e363a9ad357912e8e3 Mon Sep 17 00:00:00 2001
From: Orlando Cazalet-Hyams <orlando.hyams at sony.com>
Date: Fri, 22 Mar 2024 11:52:09 +0000
Subject: [PATCH] llvm-link

---
 llvm/tools/llvm-link/llvm-link.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/llvm/tools/llvm-link/llvm-link.cpp b/llvm/tools/llvm-link/llvm-link.cpp
index 9e7f2c3ebac437..b125126556d430 100644
--- a/llvm/tools/llvm-link/llvm-link.cpp
+++ b/llvm/tools/llvm-link/llvm-link.cpp
@@ -135,6 +135,7 @@ static cl::opt<bool> TryUseNewDbgInfoFormat(
     cl::init(false));
 
 extern cl::opt<bool> UseNewDbgInfoFormat;
+extern cl::opt<cl::boolOrDefault> LoadBitcodeIntoNewDbgInfoFormat;
 
 static ExitOnError ExitOnErr;
 
@@ -479,6 +480,9 @@ int main(int argc, char **argv) {
 
   cl::HideUnrelatedOptions({&LinkCategory, &getColorCategory()});
   cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");
+  // Load bitcode into the new debug info format by default.
+  if (LoadBitcodeIntoNewDbgInfoFormat == cl::boolOrDefault::BOU_UNSET)
+    LoadBitcodeIntoNewDbgInfoFormat = cl::boolOrDefault::BOU_TRUE;
 
   // RemoveDIs debug-info transition: tests may request that we /try/ to use the
   // new debug-info format.