[llvm-dev] [DebugInfo] Enabling constructor homing by default in clang

Amy Huang via llvm-dev
Thu, 15 Jul 2021 18:06:09 -0000

A while back I tried turning on constructor homing
(-debug-info-kind=constructor) by default in clang. Ctor homing is a debug
info optimization that reduces the amount of debug info that is emitted for
class types.

The main blocker was that for some libc++ types we avoid calling the
constructor. Since then I've added a attribute for classes that ignores
ctor homing (`__attribute__((standlone_debug))`) and added it to the libc++
types (7c2f58278e66).

I think at this point we can try enabling it by default in Clang -- it's
currently being used in chromium and google codebases. Thought I'd email
the llvm-dev list in case people have thoughts/opinions/concerns about
this. (patch is at https://reviews.llvm.org/D106084)
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