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llvm / llvm-project / c04958381e90c32381ddabf1552d17c63cdd060b
commitc04958381e90c32381ddabf1552d17c63cdd060b[log] [tgz]
authorAndrew Rogers <andrurogerz@gmail.com>Tue Apr 22 09:49:18 2025 -0700
committerGitHub <noreply@github.com>Tue Apr 22 09:49:18 2025 -0700
tree1381052ec05da2e9765d61717871d423a79c1707
parentab4e181ea8a1b11546328cb71c330772b8720db7 [diff]
[llvm] add LLVM_ABI_FRIEND macro for friend function decls (#136595)

## Purpose
Introduce a new `LLVM_ABI_FRIEND` macro to `llvm/Support/Compiler.h` for
annotating `friend` function declarations for DLL export.

## Overview
1. Add a new `LLVM_ABI_FRIEND` macro, which behaves identically to the
existing `LLVM_ABI` macro on Windows and compiles to nothing on other
platforms.
2. Update existing documentation to describe proper usage of the
`LLVM_ABI_FRIEND` annotation.

## Background
* MSVC issues a warning when it encounters a `friend` function
declaration that does not match the DLL import/export annotation of the
original function.
* When compiling ELF and Mach-O shared libraries, `friend` function
declarations with visibility annotations produce compilation errors
(GCC) and warnings (Clang).
* Additional context on the effort to annotate LLVM's public interface
is in [this
discourse](https://discourse.llvm.org/t/psa-annotating-llvm-public-interface/85307).
2 files changed
tree: 1381052ec05da2e9765d61717871d423a79c1707
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-format-ignore
  30. .clang-tidy
  31. .git-blame-ignore-revs
  32. .gitattributes
  33. .gitignore
  34. .mailmap
  35. CODE_OF_CONDUCT.md
  36. CONTRIBUTING.md
  37. LICENSE.TXT
  38. pyproject.toml
  39. README.md
  40. SECURITY.md
README.md

The LLVM Compiler Infrastructure

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Welcome to the LLVM project!

This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.

C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.

Other components include: the libc++ C++ standard library, the LLD linker, and more.

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For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

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