LLVM Compiler

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The LLVM compiler infrastructure project is a set of compiler and toolchain technologies, which can be used to develop a front end for any programming language and a back end for any instruction set architecture. LLVM is designed around a language-independent intermediate representation (IR) that serves as a portable, high-level assembly language that can be optimized with a variety of transformations over multiple passes.

Installation[edit | edit source]

LLVM Compiler/Installation

Main Components[edit | edit source]

LLVM contains a list components

OpenMP support[edit | edit source]

see more at LLVM Compiler/OpenMP Support

With the release of Clang 3.8.0, OpenMP 3.1 support is enabled in Clang by default, and the OpenMP runtime is therefore built as a normal part of the Clang build, and distributed with the binary distributions. You do not, therefore, need explicitly to check out this code, or build it out of tree; a normal Clang check out and build will automatically include building these runtime libraries.

https://openmp.llvm.org/


cmake -G Ninja -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=$LLVM_PATH -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;compiler-rt;openmp" -DCLANG_BUILD_EXAMPLES=1 $LLVM_SRC/llvm

ninja install -j8 -l8

Development Support[edit | edit source]

Code review of LLVM is handled by Phabricator https://reviews.llvm.org/. Regression tests are run by Buildbot http://lab.llvm.org:8011/ using test suite under https://github.com/llvm/llvm-test-suite .


LLVM uses Buildbot to run some regression tests.

Their website has JSON API: http://lab.llvm.org:8011/json/help

Take the OpenMP testing’s API results as an example

This get request will get a json file, with links to each step’s logs among other information. You check the log files from the links to see the command lines used. For example: here is the log file for the configuring step: