[all-commits] [llvm/llvm-project] 28efe1: [Clang] Implement -fkeep-inline-functions (#218533)

[Zaara Syeda via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 28efe19f92567ec666e205b860cfd77f6f1764fc
      https://github.com/llvm/llvm-project/commit/28efe19f92567ec666e205b860cfd77f6f1764fc
  Author: Zaara Syeda <syzaara at ca.ibm.com>
  Date:   2026-09-11 (Fri, 11 Sep 2026)

  Changed paths:
    M clang/docs/UsersManual.md
    M clang/include/clang/Basic/CodeGenOptions.def
    M clang/include/clang/Options/Options.td
    M clang/lib/CodeGen/CodeGenModule.cpp
    M clang/lib/Driver/ToolChains/Clang.cpp
    A clang/test/CodeGen/keep-inline-functions.c
    A clang/test/CodeGen/keep-inline-functions.cpp
    A clang/test/CodeGen/keep-inline-functions.cppm
    M clang/test/Driver/clang_f_opts.c
    A clang/test/Driver/fkeep-inline-functions.c

  Log Message:
  -----------
  [Clang] Implement -fkeep-inline-functions (#218533)

Implement the -fkeep-inline-functions flag, which forces selected inline
function definitions to be emitted into the object file even if they
have been inlined into all their callers. The function retention
behavior follows GCC's semantics.

The front-end has been modified to:
- emit the selected functions even if they are unused; and
- add the selected functions to llvm.compiler.used/llvm.used to ensure
they are retained.

The functions selected for emission are inline function definitions that
are available in the current translation unit. available_externally
definitions are excluded because their authoritative definitions are
expected to be emitted by another translation unit.

This is also done for C99 inline function external definitions with
external linkage, which would normally be emitted into the object file
anyway, to ensure the functions are retained for LTO purposes.

See the proposed Clang documentation update for details on the function
selection criteria.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications