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Update GettingStarted guide to recommend that people use the new 

official Git repository.

Remove the directions for using git-svn, and demote the prominence of
the svn instructions.

Also, fix a few other issues while I'm in there:

* Mention LLVM_ENABLE_PROJECTS more.
* Getting started doesn't need to mention test-suite, but should
  mention clang and the other projects.
* Remove mentions of "configure", since that's long gone.

I've also adjusted a few other mentions of svn to point to github, but
have not done so comprehensively.

Differential Revision: https://reviews.llvm.org/D56654

llvm-svn: 351130
This commit is contained in:
James Y Knight 2019-01-14 22:27:32 +00:00
parent 5885eec35a
commit 786558882c
8 changed files with 234 additions and 458 deletions
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22
llvm/docs/DeveloperPolicy.rst
View File

@ -22,7 +22,7 @@ This policy is also designed to accomplish the following objectives:
#. Make life as simple and easy for contributors as possible.
#. Keep the top of Subversion trees as stable as possible.
#. Keep the tip of tree as stable as possible.
#. Establish awareness of the project's :ref:`copyright, license, and patent
policies <copyright-license-patents>` with contributors to the project.
@ -80,23 +80,19 @@ Making and Submitting a Patch
When making a patch for review, the goal is to make it as easy for the reviewer
to read it as possible. As such, we recommend that you:
#. Make your patch against the Subversion trunk, not a branch, and not an old
version of LLVM. This makes it easy to apply the patch. For information on
how to check out SVN trunk, please see the `Getting Started
Guide <GettingStarted.html#checkout>`_.
#. Make your patch against git master, not a branch, and not an old version
of LLVM. This makes it easy to apply the patch. For information on how to
clone from git, please see the :ref:`Getting Started Guide
<checkout>`.
#. Similarly, patches should be submitted soon after they are generated. Old
patches may not apply correctly if the underlying code changes between the
time the patch was created and the time it is applied.
#. Patches should be made with ``svn diff``, or similar. If you use a
#. Patches should be made with ``git format-patch``, or similar. If you use a
different tool, make sure it uses the ``diff -u`` format and that it
doesn't contain clutter which makes it hard to read.
#. If you are modifying generated files, such as the top-level ``configure``
script, please separate out those changes into a separate patch from the rest
of your changes.
Once your patch is ready, submit it by emailing it to the appropriate project's
commit mailing list (or commit it directly if applicable). Alternatively, some
patches get sent to the project's development list or component of the LLVM bug
@ -187,9 +183,9 @@ someone else will review it, allowing the patch to go unreviewed. To solve this
problem, we have a notion of an 'owner' for a piece of the code. The sole
responsibility of a code owner is to ensure that a commit to their area of the
code is appropriately reviewed, either by themself or by someone else. The list
of current code owners can be found in the file
`CODE_OWNERS.TXT <http://git.llvm.org/klaus/llvm/blob/master/CODE_OWNERS.TXT>`_
in the root of the LLVM source tree.
of current code owners can be found in the file `CODE_OWNERS.TXT
<https://github.com/llvm/llvm-project/blob/master/llvm/CODE_OWNERS.TXT>`_ in the
root of the LLVM source tree.
Note that code ownership is completely different than reviewers: anyone can
review a piece of code, and we welcome code review from anyone who is

593
llvm/docs/GettingStarted.rst
View File

@ -8,23 +8,22 @@ Getting Started with the LLVM System
Overview
========
Welcome to LLVM! In order to get started, you first need to know some basic
information.
Welcome to the LLVM project! In order to get started, you first need to know
some basic information.
First, LLVM comes in three pieces. The first piece is the LLVM suite. This
contains all of the tools, libraries, and header files needed to use LLVM. It
contains an assembler, disassembler, bitcode analyzer and bitcode optimizer. It
also contains basic regression tests that can be used to test the LLVM tools and
the Clang front end.
First, 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 an intermediate representation and convert it into
object files. It contains an assembler, disassembler, bitcode analyzer and
bitcode optimizer. It also contains basic regression tests.
The second piece is the `Clang <http://clang.llvm.org/>`_ front end. This
component compiles C, C++, Objective C, and Objective C++ code into LLVM
bitcode. Once compiled into LLVM bitcode, a program can be manipulated with the
LLVM tools from the LLVM suite.
Another piece is the `Clang <http://clang.llvm.org/>`_ front end. This
component compiles C, C++, Objective C, and Objective C++ code into LLVM bitcode
-- and from there into object files, using LLVM.
There is a third, optional piece called Test Suite. It is a suite of programs
with a testing harness that can be used to further test LLVM's functionality
and performance.
There are other components as well:
the `libc++ C++ standard library <https://libcxx.llvm.org>`_,
the `LLD linker <https://lld.llvm.org>`_, and more.
Getting Started Quickly (A Summary)
===================================
@ -39,90 +38,38 @@ Here's the short story for getting up and running quickly with LLVM:
#. Read the documentation.
#. Remember that you were warned twice about reading the documentation.
* In particular, the *relative paths specified are important*.
#. Checkout LLVM (including related subprojects like Clang):
#. Checkout LLVM:
* ``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``
* ``cd where-you-want-llvm-to-live``
* ``svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm``
#. Configure and build LLVM and Clang:.
#. Checkout Clang:
* ``cd where-you-want-llvm-to-live``
* ``cd llvm/tools``
* ``svn co http://llvm.org/svn/llvm-project/cfe/trunk clang``
#. Checkout Extra Clang Tools **[Optional]**:
* ``cd where-you-want-llvm-to-live``
* ``cd llvm/tools/clang/tools``
* ``svn co http://llvm.org/svn/llvm-project/clang-tools-extra/trunk extra``
#. Checkout LLD linker **[Optional]**:
* ``cd where-you-want-llvm-to-live``
* ``cd llvm/tools``
* ``svn co http://llvm.org/svn/llvm-project/lld/trunk lld``
#. Checkout Polly Loop Optimizer **[Optional]**:
* ``cd where-you-want-llvm-to-live``
* ``cd llvm/tools``
* ``svn co http://llvm.org/svn/llvm-project/polly/trunk polly``
#. Checkout Compiler-RT (required to build the sanitizers) **[Optional]**:
* ``cd where-you-want-llvm-to-live``
* ``cd llvm/projects``
* ``svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt``
#. Checkout Libomp (required for OpenMP support) **[Optional]**:
* ``cd where-you-want-llvm-to-live``
* ``cd llvm/projects``
* ``svn co http://llvm.org/svn/llvm-project/openmp/trunk openmp``
#. Checkout libcxx and libcxxabi **[Optional]**:
* ``cd where-you-want-llvm-to-live``
* ``cd llvm/projects``
* ``svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx``
* ``svn co http://llvm.org/svn/llvm-project/libcxxabi/trunk libcxxabi``
#. Get the Test Suite Source Code **[Optional]**
* ``cd where-you-want-llvm-to-live``
* ``cd llvm/projects``
* ``svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite``
#. Configure and build LLVM and Clang:
*Warning:* Make sure you've checked out *all of* the source code
before trying to configure with cmake. cmake does not pickup newly
added source directories in incremental builds.
The build uses `CMake <CMake.html>`_. LLVM requires CMake 3.4.3 to build. It
is generally recommended to use a recent CMake, especially if you're
generating Ninja build files. This is because the CMake project is constantly
improving the quality of the generators, and the Ninja generator gets a lot
of attention.
* ``cd where you want to build llvm``
* ``cd llvm-project``
* ``mkdir build``
* ``cd build``
* ``cmake -G <generator> [options] <path to llvm sources>``
* ``cmake -G <generator> [options] ../llvm``
Some common generators are:
* ``Unix Makefiles`` --- for generating make-compatible parallel makefiles.
* ``Ninja`` --- for generating `Ninja <https://ninja-build.org>`_
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,
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``).
@ -135,16 +82,18 @@ Here's the short story for getting up and running quickly with LLVM:
* Run your build tool of choice!
* The default target (i.e. ``make``) will build all of LLVM
* The default target (i.e. ``ninja`` or ``make``) will build all of LLVM.
* The ``check-all`` target (i.e. ``make check-all``) will run the
* 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*. Make sure you run a
parallel build; for ``make``, use ``make -j``.
* Running a serial build will be *slow*. Make sure you run a parallel
build. That's already done by default in Ninja; for ``make``, use
``make -j NNN`` (with an appropriate value of NNN, e.g. number of CPUs
you have.)
* For more information see `CMake <CMake.html>`_
@ -172,7 +121,7 @@ OS Arch Compilers
================== ===================== =============
Linux x86\ :sup:`1` GCC, Clang
Linux amd64 GCC, Clang
Linux ARM\ :sup:`4` GCC, Clang
Linux ARM GCC, Clang
Linux PowerPC GCC, Clang
Solaris V9 (Ultrasparc) GCC
FreeBSD x86\ :sup:`1` GCC, Clang
@ -192,7 +141,6 @@ Windows x64 x86-64 Visual Studio
#. Code generation supported for 32-bit ABI only
#. To use LLVM modules on Win32-based system, you may configure LLVM
with ``-DBUILD_SHARED_LIBS=On``.
#. MCJIT not working well pre-v7, old JIT engine not supported any more.
Note that Debug builds require a lot of time and disk space. An LLVM-only build
will need about 1-3 GB of space. A full build of LLVM and Clang will need around
@ -433,10 +381,9 @@ Unpacking the LLVM Archives
---------------------------
If you have the LLVM distribution, you will need to unpack it before you can
begin to compile it. LLVM is distributed as a set of two files: the LLVM suite
and the LLVM GCC front end compiled for your platform. There is an additional
test suite that is optional. Each file is a TAR archive that is compressed with
the gzip program.
begin to compile it. LLVM is distributed as a number of different
subprojects. Each one has its own download which is a TAR archive that is
compressed with the gzip program.
The files are as follows, with *x.y* marking the version number:
@ -444,18 +391,132 @@ The files are as follows, with *x.y* marking the version number:
Source release for the LLVM libraries and tools.
``llvm-test-x.y.tar.gz``
``cfe-x.y.tar.gz``
Source release for the LLVM test-suite.
Source release for the Clang frontend.
.. _checkout:
Checkout LLVM from Subversion
-----------------------------
Checkout LLVM from Git
----------------------
If you have access to our Subversion repository, you can get a fresh copy of the
entire source code. All you need to do is check it out from Subversion as
follows:
You can also checkout the source code for LLVM from Git. While the LLVM
project's official source-code repository is Subversion, we are in the process
of migrating to git. We currently recommend that all developers use Git for
day-to-day development.
.. note::
Passing ``--config core.autocrlf=false`` should not be required in
the future after we adjust the .gitattribute settings correctly, but
is required for Windows users at the time of this writing.
Simply run:
.. code-block:: console
% git clone https://github.com/llvm/llvm-project.git`
or on Windows,
.. code-block:: console
% git clone --config core.autocrlf=false https://github.com/llvm/llvm-project.git
This will create an '``llvm-project``' directory in the current directory and
fully populate it with all of the source code, test directories, and local
copies of documentation files for LLVM and all the related subprojects. Note
that unlike the tarballs, which contain each subproject in a separate file, the
git repository contains all of the projects together.
If you want to get a specific release (as opposed to the most recent revision),
you can check out a tag after cloning the repository. E.g., `git checkout
llvmorg-6.0.1` inside the ``llvm-project`` directory created by the above
command. Use `git tag -l` to list all of them.
Sending patches
^^^^^^^^^^^^^^^
Please read `Developer Policy <DeveloperPolicy.html#one-off-patches>`_, too.
We don't currently accept github pull requests, so you'll need to send patches
either via emailing to llvm-commits, or, preferably, via :ref:`Phabricator
<phabricator-reviews>`.
You'll generally want to make sure your branch has a single commit,
corresponding to the review you wish to send, up-to-date with the upstream
``origin/master`` branch, and doesn't contain merges. Once you have that, you
can use ``git show`` or ``git format-patch`` to output the diff, and attach it
to a Phabricator review (or to an email message).
However, using the "Arcanist" tool is often easier. After `installing
arcanist`_, you can upload the latest commit using:
.. code-block:: console
% arc diff HEAD~1
Additionally, before sending a patch for review, please also try to ensure it's
formatted properly. We use ``clang-format`` for this, which has git integration
through the ``git-clang-format`` script. On some systems, it may already be
installed (or be installable via your package manager). If so, you can simply
run it -- the following command will format only the code changed in the most
recent commit:
.. code-block:: console
% git clang-format HEAD~1
Note that this modifies the files, but doesn't commit them -- you'll likely want
to run
.. code-block:: console
% git commit --amend -a
in order to update the last commit with all pending changes.
.. note::
If you don't already have ``clang-format`` or ``git clang-format`` installed
on your system, the ``clang-format`` binary will be built alongside clang, and
the git integration can be run from
``clang/tools/clang-format/git-clang-format``.
.. _commit_from_git:
For developers to commit changes from Git
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
A helper script is provided in ``llvm/utils/git-svn/git-llvm``. After you add it
to your path, you can push committed changes upstream with ``git llvm
push``. While this creates a Subversion checkout and patches it under the hood,
it does not require you to have interaction with it.
.. code-block:: console
% export PATH=$PATH:$TOP_LEVEL_DIR/llvm-project/llvm/utils/git-svn/
% git llvm push
Within a couple minutes after pushing to subversion, the svn commit will have
been converted back to a Git commit, and made its way into the official Git
repository. At that point, ``git pull`` should get back the changes as they were
committed.
You'll likely want to ``git pull --rebase`` to get the official git commit
downloaded back to your repository. The SVN revision numbers of each commit can
be found at the end of the commit message, e.g. ``llvm-svn: 350914``.
You may also find the ``-n`` flag useful, like ``git llvm push -n``. This runs
through all the steps of committing _without_ actually doing the commit, and
tell you what it would have done. That can be useful if you're unsure whether
the right thing will happen.
Checkout via SVN (deprecated)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Until we have fully migrated to Git, you may also get a fresh copy of
the code from the official Subversion repository.
* ``cd where-you-want-llvm-to-live``
* Read-Only: ``svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm``
@ -475,305 +536,13 @@ directory:
* Release 1.1 through 2.8: **RELEASE_11** and so on
* Release 1.0: **RELEASE_1**
If you would like to get the LLVM test suite (a separate package as of 1.4), you
get it from the Subversion repository:
.. code-block:: console
% cd llvm/projects
% svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite
By placing it in the ``llvm/projects``, it will be automatically configured by
the LLVM cmake configuration.
Git Mirror
----------
Git mirrors are available for a number of LLVM subprojects. These mirrors sync
automatically with each Subversion commit and contain all necessary git-svn
marks (so, you can recreate git-svn metadata locally). Note that right now
mirrors reflect only ``trunk`` for each project.
.. note::
On Windows, first you will want to do ``git config --global core.autocrlf
false`` before you clone. This goes a long way toward ensuring that
line-endings will be handled correctly (the LLVM project mostly uses Linux
line-endings).
You can do the read-only Git clone of LLVM via:
.. code-block:: console
% git clone https://git.llvm.org/git/llvm.git/
If you want to check out clang too, run:
.. code-block:: console
% cd llvm/tools
% git clone https://git.llvm.org/git/clang.git/
If you want to check out compiler-rt (required to build the sanitizers), run:
.. code-block:: console
% cd llvm/projects
% git clone https://git.llvm.org/git/compiler-rt.git/
If you want to check out libomp (required for OpenMP support), run:
.. code-block:: console
% cd llvm/projects
% git clone https://git.llvm.org/git/openmp.git/
If you want to check out libcxx and libcxxabi (optional), run:
.. code-block:: console
% cd llvm/projects
% git clone https://git.llvm.org/git/libcxx.git/
% git clone https://git.llvm.org/git/libcxxabi.git/
If you want to check out the Test Suite Source Code (optional), run:
.. code-block:: console
% cd llvm/projects
% git clone https://git.llvm.org/git/test-suite.git/
Since the upstream repository is in Subversion, you should use ``git
pull --rebase`` instead of ``git pull`` to avoid generating a non-linear history
in your clone. To configure ``git pull`` to pass ``--rebase`` by default on the
master branch, run the following command:
.. code-block:: console
% git config branch.master.rebase true
Sending patches with Git
^^^^^^^^^^^^^^^^^^^^^^^^
Please read `Developer Policy <DeveloperPolicy.html#one-off-patches>`_, too.
Assume ``master`` points the upstream and ``mybranch`` points your working
branch, and ``mybranch`` is rebased onto ``master``. At first you may check
sanity of whitespaces:
.. code-block:: console
% git diff --check master..mybranch
The easiest way to generate a patch is as below:
.. code-block:: console
% git diff master..mybranch > /path/to/mybranch.diff
It is a little different from svn-generated diff. git-diff-generated diff has
prefixes like ``a/`` and ``b/``. Don't worry, most developers might know it
could be accepted with ``patch -p1 -N``.
But you may generate patchset with git-format-patch. It generates by-each-commit
patchset. To generate patch files to attach to your article:
.. code-block:: console
% git format-patch --no-attach master..mybranch -o /path/to/your/patchset
If you would like to send patches directly, you may use git-send-email or
git-imap-send. Here is an example to generate the patchset in Gmail's [Drafts].
.. code-block:: console
% git format-patch --attach master..mybranch --stdout | git imap-send
Then, your .git/config should have [imap] sections.
.. code-block:: ini
[imap]
host = imaps://imap.gmail.com
user = your.gmail.account@gmail.com
pass = himitsu!
port = 993
sslverify = false
; in English
folder = "[Gmail]/Drafts"
; example for Japanese, "Modified UTF-7" encoded.
folder = "[Gmail]/&Tgtm+DBN-"
; example for Traditional Chinese
folder = "[Gmail]/&g0l6Pw-"
.. _developers-work-with-git-svn:
For developers to work with git-svn
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
To set up clone from which you can submit code using ``git-svn``, run:
.. code-block:: console
% git clone https://git.llvm.org/git/llvm.git/
% cd llvm
% git svn init https://llvm.org/svn/llvm-project/llvm/trunk --username=<username>
% git config svn-remote.svn.fetch :refs/remotes/origin/master
% git svn rebase -l # -l avoids fetching ahead of the git mirror.
# If you have clang too:
% cd tools
% git clone https://git.llvm.org/git/clang.git/
% cd clang
% git svn init https://llvm.org/svn/llvm-project/cfe/trunk --username=<username>
% git config svn-remote.svn.fetch :refs/remotes/origin/master
% git svn rebase -l
Likewise for compiler-rt, libomp and test-suite.
To update this clone without generating git-svn tags that conflict with the
upstream Git repo, run:
.. code-block:: console
% git fetch && (cd tools/clang && git fetch) # Get matching revisions of both trees.
% git checkout master
% git svn rebase -l
% (cd tools/clang &&
git checkout master &&
git svn rebase -l)
Likewise for compiler-rt, libomp and test-suite.
This leaves your working directories on their master branches, so you'll need to
``checkout`` each working branch individually and ``rebase`` it on top of its
parent branch.
For those who wish to be able to update an llvm repo/revert patches easily using
git-svn, please look in the directory for the scripts ``git-svnup`` and
``git-svnrevert``.
To perform the aforementioned update steps go into your source directory and
just type ``git-svnup`` or ``git svnup`` and everything will just work.
If one wishes to revert a commit with git-svn, but do not want the git hash to
escape into the commit message, one can use the script ``git-svnrevert`` or
``git svnrevert`` which will take in the git hash for the commit you want to
revert, look up the appropriate svn revision, and output a message where all
references to the git hash have been replaced with the svn revision.
To commit back changes via git-svn, use ``git svn dcommit``:
.. code-block:: console
% git svn dcommit
Note that git-svn will create one SVN commit for each Git commit you have pending,
so squash and edit each commit before executing ``dcommit`` to make sure they all
conform to the coding standards and the developers' policy.
On success, ``dcommit`` will rebase against the HEAD of SVN, so to avoid conflict,
please make sure your current branch is up-to-date (via fetch/rebase) before
proceeding.
The git-svn metadata can get out of sync after you mess around with branches and
``dcommit``. When that happens, ``git svn dcommit`` stops working, complaining
about files with uncommitted changes. The fix is to rebuild the metadata:
.. code-block:: console
% rm -rf .git/svn
% git svn rebase -l
Please, refer to the Git-SVN manual (``man git-svn``) for more information.
For developers to work with a git monorepo
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. note::
This set-up is using an unofficial mirror hosted on GitHub, use with caution.
To set up a clone of all the llvm projects using a unified repository:
.. code-block:: console
% export TOP_LEVEL_DIR=`pwd`
% git clone https://github.com/llvm-project/llvm-project-20170507/ llvm-project
% cd llvm-project
% git config branch.master.rebase true
You can configure various build directory from this clone, starting with a build
of LLVM alone:
.. code-block:: console
% cd $TOP_LEVEL_DIR
% mkdir llvm-build && cd llvm-build
% cmake -GNinja ../llvm-project/llvm
Or lldb:
.. code-block:: console
% cd $TOP_LEVEL_DIR
% mkdir lldb-build && cd lldb-build
% cmake -GNinja ../llvm-project/llvm -DLLVM_ENABLE_PROJECTS=lldb
Or a combination of multiple projects:
.. code-block:: console
% cd $TOP_LEVEL_DIR
% mkdir clang-build && cd clang-build
% cmake -GNinja ../llvm-project/llvm -DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi"
A helper script is provided in ``llvm/utils/git-svn/git-llvm``. After you add it
to your path, you can push committed changes upstream with ``git llvm push``.
.. code-block:: console
% export PATH=$PATH:$TOP_LEVEL_DIR/llvm-project/llvm/utils/git-svn/
% git llvm push
While this is using SVN under the hood, it does not require any interaction from
you with git-svn.
After a few minutes, ``git pull`` should get back the changes as they were
committed. Note that a current limitation is that ``git`` does not directly
record file rename, and thus it is propagated to SVN as a combination of
delete-add instead of a file rename.
The SVN revision of each monorepo commit can be found in the commit notes. git
does not fetch notes by default. The following commands will fetch the notes and
configure git to fetch future notes. Use ``git notes show $commit`` to look up
the SVN revision of a git commit. The notes show up ``git log``, and searching
the log is currently the recommended way to look up the git commit for a given
SVN revision.
.. code-block:: console
% git config --add remote.origin.fetch +refs/notes/commits:refs/notes/commits
% git fetch
If you are using `arc` to interact with Phabricator, you need to manually put it
at the root of the checkout:
.. code-block:: console
% cd $TOP_LEVEL_DIR
% cp llvm/.arcconfig ./
% mkdir -p .git/info/
% echo .arcconfig >> .git/info/exclude
Local LLVM Configuration
------------------------
Once checked out from the Subversion repository, the LLVM suite source code must
be configured before being built. This process uses CMake.
Unlinke the normal ``configure`` script, CMake
generates the build files in whatever format you request as well as various
``*.inc`` files, and ``llvm/include/Config/config.h``.
Once checked out repository, the LLVM suite source code must be configured
before being built. This process uses CMake. Unlinke the normal ``configure``
script, CMake generates the build files in whatever format you request as well
as various ``*.inc`` files, and ``llvm/include/Config/config.h``.
Variables are passed to ``cmake`` on the command line using the format
``-D<variable name>=<value>``. The following variables are some common options
@ -797,19 +566,26 @@ used by people developing LLVM.
| | running the install action of the build files. |
+-------------------------+----------------------------------------------------+
| LLVM_TARGETS_TO_BUILD | A semicolon delimited list controlling which |
| | targets will be built and linked into llc. This is |
| | equivalent to the ``--enable-targets`` option in |
| | the configure script. The default list is defined |
| | as ``LLVM_ALL_TARGETS``, and can be set to include |
| | targets will be built and linked into llvm. |
| | The default list is defined as |
| | ``LLVM_ALL_TARGETS``, and can be set to include |
| | out-of-tree targets. The default value includes: |
| | ``AArch64, AMDGPU, ARM, BPF, Hexagon, Mips, |
| | MSP430, NVPTX, PowerPC, Sparc, SystemZ, X86, |
| | XCore``. |
| | |
+-------------------------+----------------------------------------------------+
| LLVM_ENABLE_DOXYGEN | Build doxygen-based documentation from the source |
| | code This is disabled by default because it is |
| | slow and generates a lot of output. |
+-------------------------+----------------------------------------------------+
| LLVM_ENABLE_PROJECTS | A semicolon-delimited list selecting which of the |
| | other LLVM subprojects to additionally build. (Only|
| | effective when using a side-by-side project layout |
| | e.g. via git). The default list is empty. Can |
| | include: clang, libcxx, libcxxabi, libunwind, lldb,|
| | compiler-rt, lld, polly, or debuginfo-tests. |
+-------------------------+----------------------------------------------------+
| LLVM_ENABLE_SPHINX | Build sphinx-based documentation from the source |
| | code. This is disabled by default because it is |
| | slow and generates a lot of output. Sphinx version |
@ -1030,10 +806,10 @@ Public header files exported from the LLVM library. The three main subdirectorie
``llvm/include/llvm/Config``
Header files configured by the ``configure`` script.
They wrap "standard" UNIX and C header files. Source code can include these
header files which automatically take care of the conditional #includes that
the ``configure`` script generates.
Header files configured by ``cmake``. They wrap "standard" UNIX and
C header files. Source code can include these header files which
automatically take care of the conditional #includes that ``cmake``
generates.
``llvm/lib``
------------
@ -1105,10 +881,11 @@ are intended to run quickly and cover a lot of territory without being exhaustiv
``test-suite``
--------------
A comprehensive correctness, performance, and benchmarking test suite for LLVM.
Comes in a separate Subversion module because not every LLVM user is interested
in such a comprehensive suite. For details see the :doc:`Testing Guide
<TestingGuide>` document.
A comprehensive correctness, performance, and benchmarking test suite
for LLVM. This comes in a ``separate git repository
<https://github.com/llvm/llvm-test-suite>``, because it contains a
large amount of third-party code under a variety of licenses. For
details see the :doc:`Testing Guide <TestingGuide>` document.
.. _tools:
@ -1322,3 +1099,5 @@ write something up!). For more information about LLVM, check out:
* `LLVM Homepage <http://llvm.org/>`_
* `LLVM Doxygen Tree <http://llvm.org/doxygen/>`_
* `Starting a Project that Uses LLVM <http://llvm.org/docs/Projects.html>`_
.. _installing arcanist: https://secure.phabricator.com/book/phabricator/article/arcanist_quick_start/

67
llvm/docs/Phabricator.rst
View File

@ -1,3 +1,5 @@
.. _phabricator-reviews:
=============================
Code Reviews with Phabricator
=============================
@ -16,7 +18,7 @@ to respond to free-form comments in mail sent to the commits list.
Sign up
-------
To get started with Phabricator, navigate to `http://reviews.llvm.org`_ and
To get started with Phabricator, navigate to `https://reviews.llvm.org`_ and
click the power icon in the top right. You can register with a GitHub account,
a Google account, or you can create your own profile.
@ -151,7 +153,7 @@ ends with the line:
Differential Revision: <URL>
where ``<URL>`` is the URL for the code review, starting with
``http://reviews.llvm.org/``.
``https://reviews.llvm.org/``.
This allows people reading the version history to see the review for
context. This also allows Phabricator to detect the commit, close the
@ -162,11 +164,11 @@ be added automatically. If you don't want to use Arcanist, you can add the
``Differential Revision`` line (as the last line) to the commit message
yourself.
Using the Arcanist tool can simplify the process of committing reviewed code
as it will retrieve reviewers, the ``Differential Revision``, etc from the review
and place it in the commit message. Several methods of using Arcanist to commit
code are given below. If you do not wish to use Arcanist then simply commit
the reviewed patch as you would normally.
Using the Arcanist tool can simplify the process of committing reviewed code as
it will retrieve reviewers, the ``Differential Revision``, etc from the review
and place it in the commit message. You may also commit an accepted change
directly using ``git llvm push``, per the section in the :ref:`getting started
guide <commit_from_git>`.
Note that if you commit the change without using Arcanist and forget to add the
``Differential Revision`` line to your commit message then it is recommended
@ -174,24 +176,9 @@ that you close the review manually. In the web UI, under "Leap Into Action" put
the SVN revision number in the Comment, set the Action to "Close Revision" and
click Submit. Note the review must have been Accepted first.
Subversion and Arcanist
^^^^^^^^^^^^^^^^^^^^^^^
On a clean Subversion working copy run the following (where ``<Revision>`` is
the Phabricator review number):
::
arc patch D<Revision>
arc commit --revision D<Revision>
The first command will take the latest version of the reviewed patch and apply it to the working
copy. The second command will commit this revision to trunk.
git-svn and Arcanist
^^^^^^^^^^^^^^^^^^^^
This presumes that the git repository has been configured as described in :ref:`developers-work-with-git-svn`.
Committing someone's change from Phabricator
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
On a clean Git repository on an up to date ``master`` branch run the
following (where ``<Revision>`` is the Phabricator review number):
@ -205,17 +192,31 @@ This will create a new branch called ``arcpatch-D<Revision>`` based on the
current ``master`` and will create a commit corresponding to ``D<Revision>`` with a
commit message derived from information in the Phabricator review.
Check you are happy with the commit message and amend it if necessary. Now switch to
the ``master`` branch and add the new commit to it and commit it to trunk. This
can be done by running the following:
Check you are happy with the commit message and amend it if necessary. Then,
make sure the commit is up-to-date, and commit it. This can be done by running
the following:
::
git checkout master
git merge --ff-only arcpatch-D<Revision>
git svn dcommit
git pull --rebase origin master
git show # Ensure the patch looks correct.
ninja check-$whatever # Rerun the appropriate tests if needed.
git llvm push
Subversion and Arcanist (deprecated)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
To download a change from Phabricator and commit it with subversion, you should
first make sure you have a clean working directory. Then run the following
(where ``<Revision>`` is the Phabricator review number):
::
arc patch D<Revision>
arc commit --revision D<Revision>
The first command will take the latest version of the reviewed patch and apply
it to the working copy. The second command will commit this revision to trunk.
Abandoning a change
-------------------
@ -241,9 +242,9 @@ requests. We're looking into what the right long-term hosting for this is, but
note that it is a derivative of an existing open source project, and so not
trivially a good fit for an official LLVM project.
.. _LLVM's Phabricator: http://reviews.llvm.org
.. _`http://reviews.llvm.org`: http://reviews.llvm.org
.. _Code Repository Browser: http://reviews.llvm.org/diffusion/
.. _LLVM's Phabricator: https://reviews.llvm.org
.. _`https://reviews.llvm.org`: https://reviews.llvm.org
.. _Code Repository Browser: https://reviews.llvm.org/diffusion/
.. _Arcanist Quick Start: https://secure.phabricator.com/book/phabricator/article/arcanist_quick_start/
.. _Arcanist User Guide: https://secure.phabricator.com/book/phabricator/article/arcanist/
.. _llvm-reviews GitHub project: https://github.com/r4nt/llvm-reviews/

2
llvm/docs/TypeMetadata.rst
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@ -223,4 +223,4 @@ efficiently to minimize the sizes of the underlying bitsets.
ret void
}
.. _GlobalLayoutBuilder: http://git.llvm.org/klaus/llvm/blob/master/include/llvm/Transforms/IPO/LowerTypeTests.h
.. _GlobalLayoutBuilder: https://github.com/llvm/llvm-project/blob/master/llvm/include/llvm/Transforms/IPO/LowerTypeTests.h

2
llvm/docs/Vectorizers.rst
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@ -374,7 +374,7 @@ Performance
-----------
This section shows the execution time of Clang on a simple benchmark:
`gcc-loops <http://llvm.org/viewvc/llvm-project/test-suite/trunk/SingleSource/UnitTests/Vectorizer/>`_.
`gcc-loops <https://github.com/llvm/llvm-test-suite/tree/master/SingleSource/UnitTests/Vectorizer>`_.
This benchmarks is a collection of loops from the GCC autovectorization
`page <http://gcc.gnu.org/projects/tree-ssa/vectorization.html>`_ by Dorit Nuzman.

2
llvm/docs/index.rst
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@ -232,7 +232,7 @@ For developers of applications which use LLVM as a library.
`Documentation for Go bindings <http://godoc.org/llvm.org/llvm/bindings/go/llvm>`_
`ViewVC Repository Browser <http://llvm.org/viewvc/>`_
`Github Source Repository Browser <http://github.com/llvm/llvm-project//>`_
..
:doc:`CompilerWriterInfo`

2
llvm/test/Transforms/SLPVectorizer/AArch64/matmul.ll
View File

@ -4,7 +4,7 @@
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
; This test is reduced from the matrix multiplication benchmark in the test-suite:
; http://www.llvm.org/viewvc/llvm-project/test-suite/trunk/SingleSource/Benchmarks/Misc/matmul_f64_4x4.c
; https://github.com/llvm/llvm-test-suite/tree/master/SingleSource/Benchmarks/Misc/matmul_f64_4x4.c
; The operations here are expected to be vectorized to <2 x double>.
; Otherwise, performance will suffer on Cortex-A53.

2
llvm/test/Transforms/SLPVectorizer/AArch64/tsc-s352.ll
View File

@ -4,7 +4,7 @@
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
; This test is reduced from the TSVC evaluation of vectorizers:
; http://www.llvm.org/viewvc/llvm-project/test-suite/trunk/MultiSource/Benchmarks/TSVC/LoopRerolling-flt/tsc.c?view=log
; https://github.com/llvm/llvm-test-suite/commits/master/MultiSource/Benchmarks/TSVC/LoopRerolling-flt/tsc.c
; Two loads and an fmul are expected to be vectorized to <2 x float>.
; Otherwise, performance will suffer on Cortex-A53.
; See https://bugs.llvm.org/show_bug.cgi?id=36280 for more details.