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Miloš Stojanović 4bd40f71a7 Recommit: "[llvm-exegesis] Improve error reporting in Target.cpp"
Summary: Commit 141915963b was reverted in
abe01e17f6 because it broke builds testing
without libpfm. A preparatory commit <commit_sha1> was added to enable
this recommit.

Original commit message:

Followup to D74085.
Replace the use of `report_fatal_error()` with returning the error to
`llvm-exegesis.cpp` and handling it there.

Differential Revision: https://reviews.llvm.org/D74113
2020-02-07 14:34:58 +01:00
clang [OpenCL] Restrict addr space conversions in nested pointers 2020-02-07 12:04:35 +00:00
clang-tools-extra PR44684: Look through parens and similar constructs when determining 2020-02-06 12:21:54 -08:00
compiler-rt [CMake] Rename EXCLUDE_FROM_ALL and make it an argument to add_lit_testsuite 2020-02-06 15:33:18 -08:00
debuginfo-tests Rename prettyprinters test to llvm-support. 2020-02-07 14:05:26 +01:00
libc Remove leftover artifacts from use of gtest. 2020-02-04 21:41:45 -08:00
libclc libclc/asin: Switch to amd builtins version of asin 2020-02-04 14:29:20 -05:00
libcxx Revert "[libcxx] Force-cache LIBCXX_CXX_ABI_LIBRARY_PATH" 2020-02-03 11:03:58 +01:00
libcxxabi [libcxxabi] Fix layout of __cxa_exception for win64 2020-02-03 09:55:02 +02:00
libunwind Fix a -Wbitwise-conditional-parentheses warning in _LIBUNWIND_ARM_EHABI libunwind builds 2020-02-03 14:17:50 -05:00
lld [LLD][ELF] Add time-trace to ELF LLD 2020-02-06 12:14:13 +00:00
lldb [lldb] Improve error message when running static initializers in an expression fails 2020-02-07 13:46:28 +01:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm Recommit: "[llvm-exegesis] Improve error reporting in Target.cpp" 2020-02-07 14:34:58 +01:00
mlir [mlir][AsmPrinter] Fix edge case when printing floating point values. 2020-02-06 18:05:53 -08:00
openmp [CMake] Rename EXCLUDE_FROM_ALL and make it an argument to add_lit_testsuite 2020-02-06 15:33:18 -08:00
parallel-libs Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
polly Compile-fix after StringRef's conversion operator has been made explicit. 2020-02-05 22:28:05 -06:00
pstl Bump the trunk major version to 11 2020-01-15 13:38:01 +01:00
.arcconfig Include phabricator.uri in .arcconfig 2020-01-23 11:50:18 -08:00
.clang-format Add .clang-tidy and .clang-format files to the toplevel of the 2019-01-29 16:43:16 +00:00
.clang-tidy - Update .clang-tidy to ignore parameters of main like functions for naming violations in clang and llvm directory 2020-01-31 16:49:45 +00:00
.git-blame-ignore-revs Add LLDB reformatting to .git-blame-ignore-revs 2019-09-04 09:31:55 +00:00
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CONTRIBUTING.md Add contributing info to CONTRIBUTING.md and README.md 2019-12-02 15:47:15 +00:00
README.md Add contributing info to CONTRIBUTING.md and README.md 2019-12-02 15:47:15 +00:00

README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime 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 converts it 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 workflow and configuration to get and build the LLVM source:

  1. Checkout LLVM (including related subprojects 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

  2. Configure and build LLVM and Clang:

    • cd llvm-project

    • mkdir build

    • cd build

    • cmake -G <generator> [options] ../llvm

      Some common 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 subprojects you'd like to additionally build. Can include any of: clang, clang-tools-extra, libcxx, libcxxabi, libunwind, lldb, compiler-rt, lld, polly, or debuginfo-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 pathname 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).

    • Run your build tool of choice!

      • 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 build 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 make -j NNN (NNN is the number of parallel jobs, use e.g. 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.