[offload] Fix duplicate __llvm_write_custom_profile on Windows PGO builds (#207366) MSVC/clang-cl lack __attribute__((weak)), so GlobalHandler.cpp provided a strong stub for __llvm_write_custom_profile. When clang_rt.profile is linked (e.g. instrumented/PGO builds) lld-link rejects the duplicate strong symbol. Replace the stub + CMake workaround with the /alternatename linker pragma, which is the standard Windows weak-symbol equivalent used by compiler-rt itself. The linker picks compiler-rt's strong definition when present. Fix the guard: use _WIN32 && !__MINGW32__ (not _MSC_VER) so the stub and /alternatename pragma apply to plain clang-on-Windows too, while MinGW (which supports __attribute__((weak)) natively) continues to use the real weak declaration. Also fix the stub signature from 8 to 10 parameters to match the header. Assisted-by: Claude
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.
Consult the Getting Started with LLVM page for information on building and running LLVM.
For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.
Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.
The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.