Louis Dionne 190b8d0b4f [clang][Darwin] Prefer the toolchain-provided libc++.dylib if there is one (#170303)
When libc++ is bootstrapped with clang, the resulting clang uses the just-built libc++
headers from <install>/bin/../include/c++/v1. However, before this patch, clang would
still use the system-provided libc++.dylib (usually in the Apple SDK) because it would
fail to add the corresponding linker flag to find the just-built libc++. After this
patch, Clang will instead link against the toolchain provided `libc++.dylib` in
`<install>/lib` if it exists, which will result in programs being linked against
corresponding libc++ headers and dylib.

Fixes #77653
rdar://107060541
2025-12-05 13:06:18 -05:00

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.

Getting the Source Code and Building LLVM

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.

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