[all-commits] [llvm/llvm-project] 74e76a: [LinkerWrapper] Switch to add_clang_tool() macro

[Andrew Ng via All-commits]

  Branch: refs/heads/release/16.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 74e76ab7b6f8b2847521950f31d56bcaedc1678d
      https://github.com/llvm/llvm-project/commit/74e76ab7b6f8b2847521950f31d56bcaedc1678d
  Author: Evangelos Foutras <https://foutrelis.com/>
  Date:   2023-04-14 (Fri, 14 Apr 2023)

  Changed paths:
    M clang/tools/clang-linker-wrapper/CMakeLists.txt

  Log Message:
  -----------
  [LinkerWrapper] Switch to add_clang_tool() macro

Summary:
This creates install-clang-linker-wrapper{,-stripped} targets which are
useful for Linux distro builds when using LLVM_DISTRIBUTION_COMPONENTS.

Fixes: https://bugs.archlinux.org/task/77814

Differential Revision: https://reviews.llvm.org/D145862

(cherry picked from commit c2aabcfc8395ba30884dd3c1ecc2b192ae85a78d)


  Commit: b5aa566a7e5326e9aecf795a3fef148798092715
      https://github.com/llvm/llvm-project/commit/b5aa566a7e5326e9aecf795a3fef148798092715
  Author: Andrew Ng <andrew.ng at sony.com>
  Date:   2023-04-14 (Fri, 14 Apr 2023)

  Changed paths:
    M llvm/lib/Support/raw_ostream.cpp

  Log Message:
  -----------
  [Support] Improve Windows performance of buffered raw_ostream

The "preferred" buffer size for raw_ostream is set to BUFSIZ which on
Windows is only 512. This results in more calls to write and this
overhead can have a significant negative impact on performance,
especially when Anti-Virus is also involved.

Therefore increase the "preferred" buffer size to 16KB for Windows.

One example of where this helps is the LLD --Map option which dumps out
the symbol map for a link. In a link of UE4, this change has been seen
to improve the performance of the symbol map writing by more than a
factor of 6.

Differential Revision: https://reviews.llvm.org/D147340

(cherry picked from commit a3aa916d019c8deb10c750acecdef650b3365f22)


Compare: https://github.com/llvm/llvm-project/compare/02aa966c1351...b5aa566a7e53