[PATCH] D129401: [libLTO] Set data-sections by default in libLTO for ELF and XCOFF.

Fangrui Song via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Tue Jul 19 22:28:38 PDT 2022


MaskRay added a comment.

I am unsure about the `llvm/lib/LTO/LTOCodeGenerator.cpp` logic. Can't your downstream project set `Config.Options.DataSections = true;` instead?



================
Comment at: clang/lib/Driver/ToolChains/CommonArgs.cpp:572
     CmdArgs.push_back("-plugin-opt=-function-sections");
   }
 
----------------
Shouldn't function-sections be updated as well?


================
Comment at: llvm/lib/LTO/LTOCodeGenerator.cpp:352
+  if (!codegen::getExplicitDataSections() &&
+      (ObjectFormat == llvm::Triple::ObjectFormatType::ELF ||
+       ObjectFormat == llvm::Triple::ObjectFormatType::XCOFF))
----------------
No need to check ObjectFormat. All (except Mach-O) lld ports default to function-sections/data-sections.

function-sections/data-sections is a no-op in Mach-O and setting the options don't hurt.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D129401/new/

https://reviews.llvm.org/D129401



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