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Mehdi Amini 78accf9f35 Make LLVM Linkage a first class attribute instead of using an integer attribute This makes the IR more readable, in particular when this will be used on the builtin func outside of the LLVM dialect. Reviewed By: wsmoses Differential Revision: https://reviews.llvm.org/D109209		2021-09-03 21:21:46 +00:00
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clang	[clang] Allow the OpenBSD driver to link the libclang_rt.profile library.	2021-09-03 17:18:40 -04:00
clang-tools-extra	Revert "[Coroutines] [Clang] Look up coroutine component in std namespace first"	2021-09-03 16:01:09 -04:00
compiler-rt	[compiler-rt][Profile] Wait for child threads in set-file-object test	2021-09-03 11:48:50 -07:00
cross-project-tests
flang	[flang] Use CMake to determine endianness.	2021-09-03 15:44:51 -05:00
libc	[libc] fix strtointeger hex prefix parsing	2021-09-03 20:39:15 +00:00
libclc	libclc: Fix rounding during type conversion	2021-08-19 22:24:19 -07:00
libcxx	[libc++] Add an assertion in the subrange constructors with a size hint	2021-09-03 16:04:02 -04:00
libcxxabi	[libc++abi] Remove workarounds for missing -Wno-exceptions on older GCCs	2021-09-03 14:23:28 -04:00
libunwind	[Unwind] Cast exception class pointer for strcpy	2021-09-02 19:01:30 +02:00
lld	DebugInfo: Fix a few bot failures for type dumping fixes	2021-09-03 14:08:58 -07:00
lldb	[lldb] Adjust parse_frames for unnamed images	2021-09-03 13:23:24 -07:00
llvm	DebugInfo: Fix a few bot failures for type dumping fixes	2021-09-03 14:08:58 -07:00
mlir	Make LLVM Linkage a first class attribute instead of using an integer attribute	2021-09-03 21:21:46 +00:00
openmp	[openmp] NFC add bitcode comment	2021-09-02 18:21:39 -05:00
parallel-libs
polly	[Polly] Use subtyped isl::schedule_nodes for ScheduleTreeVisitor. NFC.	2021-08-31 20:54:12 -05:00
pstl	[libc++] Remove test-suite annotations for unsupported Clang versions	2021-08-20 15:05:13 -04:00
runtimes
utils	[Bazel] Add explicit dependency on llvm:Support to reflect layering	2021-09-02 10:34:30 -07:00
.arcconfig
.arclint
.clang-format
.clang-tidy
.git-blame-ignore-revs
.gitignore
.mailmap	Simplify a .mailmap entry	2021-08-18 09:16:16 -04:00
CONTRIBUTING.md
README.md
SECURITY.md

README.md

The LLVM Compiler Infrastructure

This directory and its sub-directories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

The README briefly describes how to get started with building LLVM. For more information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

Getting Started with the LLVM System

Taken from https://llvm.org/docs/GettingStarted.html.

Overview

Welcome to the LLVM project!

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. It also contains basic regression tests.

C-like languages use the Clang front end. 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

The LLVM Getting Started documentation may be out of date. The Clang Getting Started page might have more accurate information.

This is an example work-flow and configuration to get and build the LLVM source:

Checkout LLVM (including related sub-projects like Clang):
- git clone https://github.com/llvm/llvm-project.git
- Or, on windows, git clone --config core.autocrlf=false https://github.com/llvm/llvm-project.git
Configure and build LLVM and Clang:
- cd llvm-project
- cmake -S llvm -B build -G <generator> [options]
  
  Some common build system generators are:
  - Ninja --- for generating Ninja build files. Most llvm developers use Ninja.
  - Unix Makefiles --- for generating make-compatible parallel makefiles.
  - Visual Studio --- for generating Visual Studio projects and solutions.
  - Xcode --- for generating Xcode projects.
  Some Common options:
  - -DLLVM_ENABLE_PROJECTS='...' --- semicolon-separated list of the LLVM sub-projects you'd like to additionally build. Can include any of: clang, clang-tools-extra, libcxx, libcxxabi, libunwind, lldb, compiler-rt, lld, polly, or cross-project-tests.
    
    For example, to build LLVM, Clang, libcxx, and libcxxabi, use -DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi".
  - -DCMAKE_INSTALL_PREFIX=directory --- Specify for directory the full path name of where you want the LLVM tools and libraries to be installed (default /usr/local).
  - -DCMAKE_BUILD_TYPE=type --- Valid options for type are Debug, Release, RelWithDebInfo, and MinSizeRel. Default is Debug.
  - -DLLVM_ENABLE_ASSERTIONS=On --- Compile with assertion checks enabled (default is Yes for Debug builds, No for all other build types).
- cmake --build build [-- [options] <target>] or your build system specified above directly.
  - The default target (i.e. ninja or make) will build all of LLVM.
  - The check-all target (i.e. ninja check-all) will run the regression tests to ensure everything is in working order.
  - CMake will generate targets for each tool and library, and most LLVM sub-projects generate their own check-<project> target.
  - Running a serial build will be slow. To improve speed, try running a parallel build. That's done by default in Ninja; for make, use the option -j NNN, where NNN is the number of parallel jobs, e.g. the number of CPUs you have.
- For more information see CMake

Consult the Getting Started with LLVM page for detailed information on configuring and compiling LLVM. You can visit Directory Layout to learn about the layout of the source code tree.