2012-07-06 13:51:50 +08:00
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========================
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Building LLVM with CMake
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========================
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.. contents::
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:local:
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Introduction
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============
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`CMake <http://www.cmake.org/>`_ is a cross-platform build-generator tool. CMake
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does not build the project, it generates the files needed by your build tool
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(GNU make, Visual Studio, etc.) for building LLVM.
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2016-02-07 03:29:23 +08:00
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If **you are a new contributor**, please start with the :doc:`GettingStarted`
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page. This page is geared for existing contributors moving from the
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legacy configure/make system.
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If you are really anxious about getting a functional LLVM build, go to the
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`Quick start`_ section. If you are a CMake novice, start with `Basic CMake usage`_
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and then go back to the `Quick start`_ section once you know what you are doing. The
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2012-07-06 13:51:50 +08:00
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`Options and variables`_ section is a reference for customizing your build. If
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you already have experience with CMake, this is the recommended starting point.
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2016-04-30 05:23:24 +08:00
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This page is geared towards users of the LLVM CMake build. If you're looking for
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information about modifying the LLVM CMake build system you may want to see the
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:doc:`CMakePrimer` page. It has a basic overview of the CMake language.
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2012-07-06 13:51:50 +08:00
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.. _Quick start:
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Quick start
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===========
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We use here the command-line, non-interactive CMake interface.
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#. `Download <http://www.cmake.org/cmake/resources/software.html>`_ and install
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CMake. Version 3.4.3 is the minimum required.
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#. Open a shell. Your development tools must be reachable from this shell
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through the PATH environment variable.
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#. Create a build directory. Building LLVM in the source
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directory is not supported. cd to this directory:
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.. code-block:: console
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$ mkdir mybuilddir
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$ cd mybuilddir
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#. Execute this command in the shell replacing `path/to/llvm/source/root` with
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the path to the root of your LLVM source tree:
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2012-12-12 22:23:14 +08:00
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.. code-block:: console
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$ cmake path/to/llvm/source/root
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CMake will detect your development environment, perform a series of tests, and
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generate the files required for building LLVM. CMake will use default values
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for all build parameters. See the `Options and variables`_ section for
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a list of build parameters that you can modify.
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This can fail if CMake can't detect your toolset, or if it thinks that the
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environment is not sane enough. In this case, make sure that the toolset that
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you intend to use is the only one reachable from the shell, and that the shell
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itself is the correct one for your development environment. CMake will refuse
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to build MinGW makefiles if you have a POSIX shell reachable through the PATH
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environment variable, for instance. You can force CMake to use a given build
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tool; for instructions, see the `Usage`_ section, below.
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#. After CMake has finished running, proceed to use IDE project files, or start
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the build from the build directory:
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.. code-block:: console
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$ cmake --build .
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The ``--build`` option tells ``cmake`` to invoke the underlying build
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tool (``make``, ``ninja``, ``xcodebuild``, ``msbuild``, etc.)
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The underlying build tool can be invoked directly, of course, but
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the ``--build`` option is portable.
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#. After LLVM has finished building, install it from the build directory:
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.. code-block:: console
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$ cmake --build . --target install
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The ``--target`` option with ``install`` parameter in addition to
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the ``--build`` option tells ``cmake`` to build the ``install`` target.
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It is possible to set a different install prefix at installation time
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by invoking the ``cmake_install.cmake`` script generated in the
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build directory:
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.. code-block:: console
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$ cmake -DCMAKE_INSTALL_PREFIX=/tmp/llvm -P cmake_install.cmake
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2012-07-06 13:51:50 +08:00
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.. _Basic CMake usage:
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.. _Usage:
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Basic CMake usage
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=================
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This section explains basic aspects of CMake
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which you may need in your day-to-day usage.
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CMake comes with extensive documentation, in the form of html files, and as
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online help accessible via the ``cmake`` executable itself. Execute ``cmake
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--help`` for further help options.
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CMake allows you to specify a build tool (e.g., GNU make, Visual Studio,
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or Xcode). If not specified on the command line, CMake tries to guess which
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build tool to use, based on your environment. Once it has identified your
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build tool, CMake uses the corresponding *Generator* to create files for your
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build tool (e.g., Makefiles or Visual Studio or Xcode project files). You can
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explicitly specify the generator with the command line option ``-G "Name of the
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generator"``. To see a list of the available generators on your system, execute
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.. code-block:: console
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$ cmake --help
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This will list the generator names at the end of the help text.
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Generators' names are case-sensitive, and may contain spaces. For this reason,
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you should enter them exactly as they are listed in the ``cmake --help``
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output, in quotes. For example, to generate project files specifically for
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Visual Studio 12, you can execute:
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.. code-block:: console
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$ cmake -G "Visual Studio 12" path/to/llvm/source/root
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For a given development platform there can be more than one adequate
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generator. If you use Visual Studio, "NMake Makefiles" is a generator you can use
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for building with NMake. By default, CMake chooses the most specific generator
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supported by your development environment. If you want an alternative generator,
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you must tell this to CMake with the ``-G`` option.
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.. todo::
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Explain variables and cache. Move explanation here from #options section.
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.. _Options and variables:
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Options and variables
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=====================
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Variables customize how the build will be generated. Options are boolean
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variables, with possible values ON/OFF. Options and variables are defined on the
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CMake command line like this:
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.. code-block:: console
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$ cmake -DVARIABLE=value path/to/llvm/source
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You can set a variable after the initial CMake invocation to change its
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value. You can also undefine a variable:
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.. code-block:: console
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$ cmake -UVARIABLE path/to/llvm/source
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Variables are stored in the CMake cache. This is a file named ``CMakeCache.txt``
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stored at the root of your build directory that is generated by ``cmake``.
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Editing it yourself is not recommended.
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Variables are listed in the CMake cache and later in this document with
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the variable name and type separated by a colon. You can also specify the
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variable and type on the CMake command line:
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.. code-block:: console
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$ cmake -DVARIABLE:TYPE=value path/to/llvm/source
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Frequently-used CMake variables
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-------------------------------
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2014-05-29 04:07:37 +08:00
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Here are some of the CMake variables that are used often, along with a
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brief explanation and LLVM-specific notes. For full documentation, consult the
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CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
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**CMAKE_BUILD_TYPE**:STRING
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Sets the build type for ``make``-based generators. Possible values are
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Release, Debug, RelWithDebInfo and MinSizeRel. If you are using an IDE such as
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Visual Studio, you should use the IDE settings to set the build type.
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**CMAKE_INSTALL_PREFIX**:PATH
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Path where LLVM will be installed if "make install" is invoked or the
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"install" target is built.
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**LLVM_LIBDIR_SUFFIX**:STRING
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Extra suffix to append to the directory where libraries are to be
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installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
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to install libraries to ``/usr/lib64``.
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**CMAKE_C_FLAGS**:STRING
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Extra flags to use when compiling C source files.
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**CMAKE_CXX_FLAGS**:STRING
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Extra flags to use when compiling C++ source files.
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.. _LLVM-specific variables:
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LLVM-specific variables
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-----------------------
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**LLVM_TARGETS_TO_BUILD**:STRING
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Semicolon-separated list of targets to build, or *all* for building all
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targets. Case-sensitive. Defaults to *all*. Example:
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``-DLLVM_TARGETS_TO_BUILD="X86;PowerPC"``.
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**LLVM_BUILD_TOOLS**:BOOL
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Build LLVM tools. Defaults to ON. Targets for building each tool are generated
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in any case. You can build a tool separately by invoking its target. For
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example, you can build *llvm-as* with a Makefile-based system by executing *make
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llvm-as* at the root of your build directory.
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**LLVM_INCLUDE_TOOLS**:BOOL
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Generate build targets for the LLVM tools. Defaults to ON. You can use this
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option to disable the generation of build targets for the LLVM tools.
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**LLVM_BUILD_EXAMPLES**:BOOL
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Build LLVM examples. Defaults to OFF. Targets for building each example are
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generated in any case. See documentation for *LLVM_BUILD_TOOLS* above for more
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details.
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**LLVM_INCLUDE_EXAMPLES**:BOOL
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Generate build targets for the LLVM examples. Defaults to ON. You can use this
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option to disable the generation of build targets for the LLVM examples.
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**LLVM_BUILD_TESTS**:BOOL
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Build LLVM unit tests. Defaults to OFF. Targets for building each unit test
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are generated in any case. You can build a specific unit test using the
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targets defined under *unittests*, such as ADTTests, IRTests, SupportTests,
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etc. (Search for ``add_llvm_unittest`` in the subdirectories of *unittests*
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for a complete list of unit tests.) It is possible to build all unit tests
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with the target *UnitTests*.
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**LLVM_INCLUDE_TESTS**:BOOL
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Generate build targets for the LLVM unit tests. Defaults to ON. You can use
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this option to disable the generation of build targets for the LLVM unit
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tests.
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**LLVM_APPEND_VC_REV**:BOOL
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Append version control revision info (svn revision number or Git revision id)
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to LLVM version string (stored in the PACKAGE_VERSION macro). For this to work
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cmake must be invoked before the build. Defaults to OFF.
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**LLVM_ENABLE_THREADS**:BOOL
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Build with threads support, if available. Defaults to ON.
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**LLVM_ENABLE_CXX1Y**:BOOL
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Build in C++1y mode, if available. Defaults to OFF.
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**LLVM_ENABLE_ASSERTIONS**:BOOL
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Enables code assertions. Defaults to ON if and only if ``CMAKE_BUILD_TYPE``
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is *Debug*.
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**LLVM_ENABLE_EH**:BOOL
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Build LLVM with exception-handling support. This is necessary if you wish to
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link against LLVM libraries and make use of C++ exceptions in your own code
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that need to propagate through LLVM code. Defaults to OFF.
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2016-05-01 23:27:47 +08:00
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**LLVM_ENABLE_EXPENSIVE_CHECKS**:BOOL
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Enable additional time/memory expensive checking. Defaults to OFF.
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**LLVM_ENABLE_PIC**:BOOL
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Add the ``-fPIC`` flag to the compiler command-line, if the compiler supports
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this flag. Some systems, like Windows, do not need this flag. Defaults to ON.
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**LLVM_ENABLE_RTTI**:BOOL
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Build LLVM with run-time type information. Defaults to OFF.
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**LLVM_ENABLE_WARNINGS**:BOOL
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Enable all compiler warnings. Defaults to ON.
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**LLVM_ENABLE_PEDANTIC**:BOOL
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Enable pedantic mode. This disables compiler-specific extensions, if
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possible. Defaults to ON.
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**LLVM_ENABLE_WERROR**:BOOL
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Stop and fail the build, if a compiler warning is triggered. Defaults to OFF.
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**LLVM_ABI_BREAKING_CHECKS**:STRING
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Used to decide if LLVM should be built with ABI breaking checks or
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not. Allowed values are `WITH_ASSERTS` (default), `FORCE_ON` and
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`FORCE_OFF`. `WITH_ASSERTS` turns on ABI breaking checks in an
|
|
|
|
assertion enabled build. `FORCE_ON` (`FORCE_OFF`) turns them on
|
2015-08-25 08:09:47 +08:00
|
|
|
(off) irrespective of whether normal (`NDEBUG`-based) assertions are
|
2015-03-27 03:25:01 +08:00
|
|
|
enabled or not. A version of LLVM built with ABI breaking checks
|
|
|
|
is not ABI compatible with a version built without it.
|
|
|
|
|
2012-07-06 13:51:50 +08:00
|
|
|
**LLVM_BUILD_32_BITS**:BOOL
|
2015-08-25 08:09:47 +08:00
|
|
|
Build 32-bit executables and libraries on 64-bit systems. This option is
|
|
|
|
available only on some 64-bit Unix systems. Defaults to OFF.
|
2012-07-06 13:51:50 +08:00
|
|
|
|
|
|
|
**LLVM_TARGET_ARCH**:STRING
|
|
|
|
LLVM target to use for native code generation. This is required for JIT
|
|
|
|
generation. It defaults to "host", meaning that it shall pick the architecture
|
|
|
|
of the machine where LLVM is being built. If you are cross-compiling, set it
|
|
|
|
to the target architecture name.
|
|
|
|
|
|
|
|
**LLVM_TABLEGEN**:STRING
|
2015-08-25 08:09:47 +08:00
|
|
|
Full path to a native TableGen executable (usually named ``llvm-tblgen``). This is
|
2012-07-06 13:51:50 +08:00
|
|
|
intended for cross-compiling: if the user sets this variable, no native
|
|
|
|
TableGen will be created.
|
|
|
|
|
|
|
|
**LLVM_LIT_ARGS**:STRING
|
|
|
|
Arguments given to lit. ``make check`` and ``make clang-test`` are affected.
|
|
|
|
By default, ``'-sv --no-progress-bar'`` on Visual C++ and Xcode, ``'-sv'`` on
|
|
|
|
others.
|
|
|
|
|
|
|
|
**LLVM_LIT_TOOLS_DIR**:PATH
|
2015-08-25 08:09:47 +08:00
|
|
|
The path to GnuWin32 tools for tests. Valid on Windows host. Defaults to
|
|
|
|
the empty string, in which case lit will look for tools needed for tests
|
|
|
|
(e.g. ``grep``, ``sort``, etc.) in your %PATH%. If GnuWin32 is not in your
|
|
|
|
%PATH%, then you can set this variable to the GnuWin32 directory so that
|
|
|
|
lit can find tools needed for tests in that directory.
|
2012-07-06 13:51:50 +08:00
|
|
|
|
|
|
|
**LLVM_ENABLE_FFI**:BOOL
|
2015-08-25 08:09:47 +08:00
|
|
|
Indicates whether the LLVM Interpreter will be linked with the Foreign Function
|
|
|
|
Interface library (libffi) in order to enable calling external functions.
|
|
|
|
If the library or its headers are installed in a custom
|
|
|
|
location, you can also set the variables FFI_INCLUDE_DIR and
|
|
|
|
FFI_LIBRARY_DIR to the directories where ffi.h and libffi.so can be found,
|
|
|
|
respectively. Defaults to OFF.
|
2012-07-06 13:51:50 +08:00
|
|
|
|
|
|
|
**LLVM_EXTERNAL_{CLANG,LLD,POLLY}_SOURCE_DIR**:PATH
|
2015-08-25 08:09:47 +08:00
|
|
|
These variables specify the path to the source directory for the external
|
|
|
|
LLVM projects Clang, lld, and Polly, respectively, relative to the top-level
|
|
|
|
source directory. If the in-tree subdirectory for an external project
|
|
|
|
exists (e.g., llvm/tools/clang for Clang), then the corresponding variable
|
|
|
|
will not be used. If the variable for an external project does not point
|
|
|
|
to a valid path, then that project will not be built.
|
2012-07-06 13:51:50 +08:00
|
|
|
|
2016-06-02 07:00:45 +08:00
|
|
|
**LLVM_EXTERNAL_PROJECTS**:STRING
|
|
|
|
Semicolon-separated list of additional external projects to build as part of
|
|
|
|
llvm. For each project LLVM_EXTERNAL_<NAME>_SOURCE_DIR have to be specified
|
|
|
|
with the path for the source code of the project. Example:
|
|
|
|
``-DLLVM_EXTERNAL_PROJECTS="Foo;Bar"
|
2016-06-02 08:26:18 +08:00
|
|
|
-DLLVM_EXTERNAL_FOO_SOURCE_DIR=/src/foo
|
|
|
|
-DLLVM_EXTERNAL_BAR_SOURCE_DIR=/src/bar``.
|
2016-06-02 07:00:45 +08:00
|
|
|
|
2012-07-06 13:51:50 +08:00
|
|
|
**LLVM_USE_OPROFILE**:BOOL
|
2015-08-25 08:09:47 +08:00
|
|
|
Enable building OProfile JIT support. Defaults to OFF.
|
2012-07-06 13:51:50 +08:00
|
|
|
|
2015-10-13 13:35:12 +08:00
|
|
|
**LLVM_PROFDATA_FILE**:PATH
|
|
|
|
Path to a profdata file to pass into clang's -fprofile-instr-use flag. This
|
|
|
|
can only be specified if you're building with clang.
|
|
|
|
|
2012-07-06 13:51:50 +08:00
|
|
|
**LLVM_USE_INTEL_JITEVENTS**:BOOL
|
2015-08-25 08:09:47 +08:00
|
|
|
Enable building support for Intel JIT Events API. Defaults to OFF.
|
2012-07-06 13:51:50 +08:00
|
|
|
|
2013-04-23 16:28:39 +08:00
|
|
|
**LLVM_ENABLE_ZLIB**:BOOL
|
2015-08-25 08:09:47 +08:00
|
|
|
Enable building with zlib to support compression/uncompression in LLVM tools.
|
2013-04-23 16:28:39 +08:00
|
|
|
Defaults to ON.
|
|
|
|
|
2013-07-09 18:56:13 +08:00
|
|
|
**LLVM_USE_SANITIZER**:STRING
|
|
|
|
Define the sanitizer used to build LLVM binaries and tests. Possible values
|
2015-06-23 02:55:46 +08:00
|
|
|
are ``Address``, ``Memory``, ``MemoryWithOrigins``, ``Undefined``, ``Thread``,
|
|
|
|
and ``Address;Undefined``. Defaults to empty string.
|
2013-07-09 18:56:13 +08:00
|
|
|
|
2016-02-09 05:01:24 +08:00
|
|
|
**LLVM_ENABLE_LTO**:STRING
|
|
|
|
Add ``-flto`` or ``-flto=`` flags to the compile and link command
|
|
|
|
lines, enabling link-time optimization. Possible values are ``Off``,
|
|
|
|
``On``, ``Thin`` and ``Full``. Defaults to OFF.
|
2016-02-04 15:28:30 +08:00
|
|
|
|
2014-11-19 18:30:02 +08:00
|
|
|
**LLVM_PARALLEL_COMPILE_JOBS**:STRING
|
|
|
|
Define the maximum number of concurrent compilation jobs.
|
|
|
|
|
|
|
|
**LLVM_PARALLEL_LINK_JOBS**:STRING
|
|
|
|
Define the maximum number of concurrent link jobs.
|
|
|
|
|
2014-04-30 00:13:27 +08:00
|
|
|
**LLVM_BUILD_DOCS**:BOOL
|
2016-02-07 23:42:12 +08:00
|
|
|
Adds all *enabled* documentation targets (i.e. Doxgyen and Sphinx targets) as
|
|
|
|
dependencies of the default build targets. This results in all of the (enabled)
|
|
|
|
documentation targets being as part of a normal build. If the ``install``
|
|
|
|
target is run then this also enables all built documentation targets to be
|
|
|
|
installed. Defaults to OFF. To enable a particular documentation target, see
|
|
|
|
see LLVM_ENABLE_SPHINX and LLVM_ENABLE_DOXYGEN.
|
2014-04-30 00:13:27 +08:00
|
|
|
|
2014-03-08 03:19:28 +08:00
|
|
|
**LLVM_ENABLE_DOXYGEN**:BOOL
|
|
|
|
Enables the generation of browsable HTML documentation using doxygen.
|
|
|
|
Defaults to OFF.
|
|
|
|
|
|
|
|
**LLVM_ENABLE_DOXYGEN_QT_HELP**:BOOL
|
|
|
|
Enables the generation of a Qt Compressed Help file. Defaults to OFF.
|
|
|
|
This affects the make target ``doxygen-llvm``. When enabled, apart from
|
|
|
|
the normal HTML output generated by doxygen, this will produce a QCH file
|
|
|
|
named ``org.llvm.qch``. You can then load this file into Qt Creator.
|
|
|
|
This option is only useful in combination with ``-DLLVM_ENABLE_DOXYGEN=ON``;
|
|
|
|
otherwise this has no effect.
|
|
|
|
|
|
|
|
**LLVM_DOXYGEN_QCH_FILENAME**:STRING
|
2015-02-10 10:04:29 +08:00
|
|
|
The filename of the Qt Compressed Help file that will be generated when
|
|
|
|
``-DLLVM_ENABLE_DOXYGEN=ON`` and
|
2014-03-08 03:19:28 +08:00
|
|
|
``-DLLVM_ENABLE_DOXYGEN_QT_HELP=ON`` are given. Defaults to
|
|
|
|
``org.llvm.qch``.
|
|
|
|
This option is only useful in combination with
|
|
|
|
``-DLLVM_ENABLE_DOXYGEN_QT_HELP=ON``;
|
2015-08-25 08:09:47 +08:00
|
|
|
otherwise it has no effect.
|
2014-03-08 03:19:28 +08:00
|
|
|
|
|
|
|
**LLVM_DOXYGEN_QHP_NAMESPACE**:STRING
|
|
|
|
Namespace under which the intermediate Qt Help Project file lives. See `Qt
|
2014-04-08 06:29:53 +08:00
|
|
|
Help Project`_
|
2014-03-08 03:19:28 +08:00
|
|
|
for more information. Defaults to "org.llvm". This option is only useful in
|
|
|
|
combination with ``-DLLVM_ENABLE_DOXYGEN_QT_HELP=ON``; otherwise
|
2015-08-25 08:09:47 +08:00
|
|
|
it has no effect.
|
2015-02-10 10:04:29 +08:00
|
|
|
|
2014-03-08 03:19:28 +08:00
|
|
|
**LLVM_DOXYGEN_QHP_CUST_FILTER_NAME**:STRING
|
2014-04-08 06:29:53 +08:00
|
|
|
See `Qt Help Project`_ for
|
2014-03-08 03:19:28 +08:00
|
|
|
more information. Defaults to the CMake variable ``${PACKAGE_STRING}`` which
|
|
|
|
is a combination of the package name and version string. This filter can then
|
|
|
|
be used in Qt Creator to select only documentation from LLVM when browsing
|
|
|
|
through all the help files that you might have loaded. This option is only
|
|
|
|
useful in combination with ``-DLLVM_ENABLE_DOXYGEN_QT_HELP=ON``;
|
2015-08-25 08:09:47 +08:00
|
|
|
otherwise it has no effect.
|
2014-03-08 03:19:28 +08:00
|
|
|
|
2014-04-08 06:29:53 +08:00
|
|
|
.. _Qt Help Project: http://qt-project.org/doc/qt-4.8/qthelpproject.html#custom-filters
|
|
|
|
|
2014-03-08 03:19:28 +08:00
|
|
|
**LLVM_DOXYGEN_QHELPGENERATOR_PATH**:STRING
|
|
|
|
The path to the ``qhelpgenerator`` executable. Defaults to whatever CMake's
|
|
|
|
``find_program()`` can find. This option is only useful in combination with
|
2015-08-25 08:09:47 +08:00
|
|
|
``-DLLVM_ENABLE_DOXYGEN_QT_HELP=ON``; otherwise it has no
|
2014-03-08 03:19:28 +08:00
|
|
|
effect.
|
|
|
|
|
2015-08-18 07:24:17 +08:00
|
|
|
**LLVM_DOXYGEN_SVG**:BOOL
|
|
|
|
Uses .svg files instead of .png files for graphs in the Doxygen output.
|
|
|
|
Defaults to OFF.
|
|
|
|
|
2014-04-30 00:13:27 +08:00
|
|
|
**LLVM_ENABLE_SPHINX**:BOOL
|
2016-02-07 23:42:12 +08:00
|
|
|
If specified, CMake will search for the ``sphinx-build`` executable and will make
|
2014-04-30 00:13:27 +08:00
|
|
|
the ``SPHINX_OUTPUT_HTML`` and ``SPHINX_OUTPUT_MAN`` CMake options available.
|
|
|
|
Defaults to OFF.
|
|
|
|
|
|
|
|
**SPHINX_EXECUTABLE**:STRING
|
|
|
|
The path to the ``sphinx-build`` executable detected by CMake.
|
|
|
|
|
|
|
|
**SPHINX_OUTPUT_HTML**:BOOL
|
|
|
|
If enabled (and ``LLVM_ENABLE_SPHINX`` is enabled) then the targets for
|
|
|
|
building the documentation as html are added (but not built by default unless
|
|
|
|
``LLVM_BUILD_DOCS`` is enabled). There is a target for each project in the
|
|
|
|
source tree that uses sphinx (e.g. ``docs-llvm-html``, ``docs-clang-html``
|
|
|
|
and ``docs-lld-html``). Defaults to ON.
|
|
|
|
|
|
|
|
**SPHINX_OUTPUT_MAN**:BOOL
|
|
|
|
If enabled (and ``LLVM_ENABLE_SPHINX`` is enabled) the targets for building
|
|
|
|
the man pages are added (but not built by default unless ``LLVM_BUILD_DOCS``
|
|
|
|
is enabled). Currently the only target added is ``docs-llvm-man``. Defaults
|
|
|
|
to ON.
|
|
|
|
|
2014-08-14 19:57:13 +08:00
|
|
|
**SPHINX_WARNINGS_AS_ERRORS**:BOOL
|
|
|
|
If enabled then sphinx documentation warnings will be treated as
|
|
|
|
errors. Defaults to ON.
|
|
|
|
|
2015-10-16 04:12:08 +08:00
|
|
|
**LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
|
|
|
|
OS X Only: If enabled CMake will generate a target named
|
|
|
|
'install-xcode-toolchain'. This target will create a directory at
|
|
|
|
$CMAKE_INSTALL_PREFIX/Toolchains containing an xctoolchain directory which can
|
|
|
|
be used to override the default system tools.
|
|
|
|
|
2016-01-15 11:33:35 +08:00
|
|
|
**LLVM_BUILD_LLVM_DYLIB**:BOOL
|
|
|
|
If enabled, the target for building the libLLVM shared library is added.
|
2016-01-19 13:43:21 +08:00
|
|
|
This library contains all of LLVM's components in a single shared library.
|
2016-01-15 11:33:35 +08:00
|
|
|
Defaults to OFF. This cannot be used in conjunction with BUILD_SHARED_LIBS.
|
2016-01-19 13:43:21 +08:00
|
|
|
Tools will only be linked to the libLLVM shared library if LLVM_LINK_LLVM_DYLIB
|
|
|
|
is also ON.
|
|
|
|
The components in the library can be customised by setting LLVM_DYLIB_COMPONENTS
|
|
|
|
to a list of the desired components.
|
2016-01-15 11:33:35 +08:00
|
|
|
|
|
|
|
**LLVM_LINK_LLVM_DYLIB**:BOOL
|
|
|
|
If enabled, tools will be linked with the libLLVM shared library. Defaults
|
|
|
|
to OFF. Setting LLVM_LINK_LLVM_DYLIB to ON also sets LLVM_BUILD_LLVM_DYLIB
|
|
|
|
to ON.
|
|
|
|
|
|
|
|
**BUILD_SHARED_LIBS**:BOOL
|
2016-01-19 13:43:21 +08:00
|
|
|
Flag indicating if each LLVM component (e.g. Support) is built as a shared
|
|
|
|
library (ON) or as a static library (OFF). Its default value is OFF. On
|
|
|
|
Windows, shared libraries may be used when building with MinGW, including
|
|
|
|
mingw-w64, but not when building with the Microsoft toolchain.
|
2016-01-15 11:33:35 +08:00
|
|
|
|
|
|
|
.. note:: BUILD_SHARED_LIBS is only recommended for use by LLVM developers.
|
|
|
|
If you want to build LLVM as a shared library, you should use the
|
|
|
|
``LLVM_BUILD_LLVM_DYLIB`` option.
|
|
|
|
|
2016-03-25 02:46:43 +08:00
|
|
|
**LLVM_OPTIMIZED_TABLEGEN**:BOOL
|
|
|
|
If enabled and building a debug or asserts build the CMake build system will
|
|
|
|
generate a Release build tree to build a fully optimized tablegen for use
|
|
|
|
during the build. Enabling this option can significantly speed up build times
|
|
|
|
especially when building LLVM in Debug configurations.
|
|
|
|
|
2016-03-19 05:16:26 +08:00
|
|
|
CMake Caches
|
|
|
|
============
|
|
|
|
|
|
|
|
Recently LLVM and Clang have been adding some more complicated build system
|
|
|
|
features. Utilizing these new features often involves a complicated chain of
|
|
|
|
CMake variables passed on the command line. Clang provides a collection of CMake
|
|
|
|
cache scripts to make these features more approachable.
|
|
|
|
|
|
|
|
CMake cache files are utilized using CMake's -C flag:
|
|
|
|
|
|
|
|
.. code-block:: console
|
|
|
|
|
|
|
|
$ cmake -C <path to cache file> <path to sources>
|
|
|
|
|
|
|
|
CMake cache scripts are processed in an isolated scope, only cached variables
|
|
|
|
remain set when the main configuration runs. CMake cached variables do not reset
|
|
|
|
variables that are already set unless the FORCE option is specified.
|
|
|
|
|
|
|
|
A few notes about CMake Caches:
|
|
|
|
|
|
|
|
- Order of command line arguments is important
|
|
|
|
|
|
|
|
- -D arguments specified before -C are set before the cache is processed and
|
|
|
|
can be read inside the cache file
|
|
|
|
- -D arguments specified after -C are set after the cache is processed and
|
|
|
|
are unset inside the cache file
|
|
|
|
|
|
|
|
- All -D arguments will override cache file settings
|
|
|
|
- CMAKE_TOOLCHAIN_FILE is evaluated after both the cache file and the command
|
|
|
|
line arguments
|
|
|
|
- It is recommended that all -D options should be specified *before* -C
|
|
|
|
|
|
|
|
For more information about some of the advanced build configurations supported
|
2016-03-19 05:57:51 +08:00
|
|
|
via Cache files see :doc:`AdvancedBuilds`.
|
2016-03-19 05:16:26 +08:00
|
|
|
|
2012-07-06 13:51:50 +08:00
|
|
|
Executing the test suite
|
|
|
|
========================
|
|
|
|
|
2015-08-25 08:09:47 +08:00
|
|
|
Testing is performed when the *check-all* target is built. For instance, if you are
|
|
|
|
using Makefiles, execute this command in the root of your build directory:
|
2012-07-06 13:51:50 +08:00
|
|
|
|
2012-12-12 22:23:14 +08:00
|
|
|
.. code-block:: console
|
2012-07-06 13:51:50 +08:00
|
|
|
|
2015-08-25 08:09:47 +08:00
|
|
|
$ make check-all
|
2012-07-06 13:51:50 +08:00
|
|
|
|
2015-08-25 08:09:47 +08:00
|
|
|
On Visual Studio, you may run tests by building the project "check-all".
|
|
|
|
For more information about testing, see the :doc:`TestingGuide`.
|
2012-07-06 13:51:50 +08:00
|
|
|
|
|
|
|
Cross compiling
|
|
|
|
===============
|
|
|
|
|
|
|
|
See `this wiki page <http://www.vtk.org/Wiki/CMake_Cross_Compiling>`_ for
|
|
|
|
generic instructions on how to cross-compile with CMake. It goes into detailed
|
|
|
|
explanations and may seem daunting, but it is not. On the wiki page there are
|
|
|
|
several examples including toolchain files. Go directly to `this section
|
|
|
|
<http://www.vtk.org/Wiki/CMake_Cross_Compiling#Information_how_to_set_up_various_cross_compiling_toolchains>`_
|
|
|
|
for a quick solution.
|
|
|
|
|
|
|
|
Also see the `LLVM-specific variables`_ section for variables used when
|
|
|
|
cross-compiling.
|
|
|
|
|
|
|
|
Embedding LLVM in your project
|
|
|
|
==============================
|
|
|
|
|
2014-07-28 21:36:37 +08:00
|
|
|
From LLVM 3.5 onwards both the CMake and autoconf/Makefile build systems export
|
|
|
|
LLVM libraries as importable CMake targets. This means that clients of LLVM can
|
2015-08-25 08:09:47 +08:00
|
|
|
now reliably use CMake to develop their own LLVM-based projects against an
|
2014-07-28 21:36:37 +08:00
|
|
|
installed version of LLVM regardless of how it was built.
|
|
|
|
|
2015-08-25 08:09:47 +08:00
|
|
|
Here is a simple example of a CMakeLists.txt file that imports the LLVM libraries
|
2014-07-28 21:36:37 +08:00
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and uses them to build a simple application ``simple-tool``.
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2012-07-06 13:51:50 +08:00
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.. code-block:: cmake
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2016-06-01 04:21:32 +08:00
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cmake_minimum_required(VERSION 3.4.3)
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project(SimpleProject)
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2014-07-28 21:36:37 +08:00
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find_package(LLVM REQUIRED CONFIG)
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2012-07-06 13:51:50 +08:00
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2014-07-28 21:36:37 +08:00
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message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
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message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")
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2014-07-28 21:36:37 +08:00
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# Set your project compile flags.
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# E.g. if using the C++ header files
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# you will need to enable C++11 support
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# for your compiler.
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2012-07-06 13:51:50 +08:00
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include_directories(${LLVM_INCLUDE_DIRS})
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add_definitions(${LLVM_DEFINITIONS})
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# Now build our tools
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add_executable(simple-tool tool.cpp)
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2014-07-28 21:36:37 +08:00
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# Find the libraries that correspond to the LLVM components
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# that we wish to use
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llvm_map_components_to_libnames(llvm_libs support core irreader)
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# Link against LLVM libraries
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target_link_libraries(simple-tool ${llvm_libs})
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2014-07-28 21:36:37 +08:00
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The ``find_package(...)`` directive when used in CONFIG mode (as in the above
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example) will look for the ``LLVMConfig.cmake`` file in various locations (see
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cmake manual for details). It creates a ``LLVM_DIR`` cache entry to save the
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directory where ``LLVMConfig.cmake`` is found or allows the user to specify the
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2016-02-05 04:08:19 +08:00
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directory (e.g. by passing ``-DLLVM_DIR=/usr/lib/cmake/llvm`` to
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2014-07-28 21:36:37 +08:00
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the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
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This file is available in two different locations.
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2016-02-05 04:08:19 +08:00
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* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
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2014-07-28 21:36:37 +08:00
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``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
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On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
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2014-07-28 21:36:37 +08:00
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2016-02-05 04:08:19 +08:00
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* ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
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``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
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available when building LLVM with CMake.**
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2014-07-28 21:36:37 +08:00
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If LLVM is installed in your operating system's normal installation prefix (e.g.
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on Linux this is usually ``/usr/``) ``find_package(LLVM ...)`` will
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automatically find LLVM if it is installed correctly. If LLVM is not installed
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or you wish to build directly against the LLVM build tree you can use
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``LLVM_DIR`` as previously mentioned.
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The ``LLVMConfig.cmake`` file sets various useful variables. Notable variables
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include
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``LLVM_CMAKE_DIR``
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The path to the LLVM CMake directory (i.e. the directory containing
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LLVMConfig.cmake).
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``LLVM_DEFINITIONS``
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A list of preprocessor defines that should be used when building against LLVM.
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``LLVM_ENABLE_ASSERTIONS``
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This is set to ON if LLVM was built with assertions, otherwise OFF.
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``LLVM_ENABLE_EH``
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This is set to ON if LLVM was built with exception handling (EH) enabled,
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otherwise OFF.
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``LLVM_ENABLE_RTTI``
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This is set to ON if LLVM was built with run time type information (RTTI),
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otherwise OFF.
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2012-07-06 13:51:50 +08:00
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2014-07-28 21:36:37 +08:00
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``LLVM_INCLUDE_DIRS``
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A list of include paths to directories containing LLVM header files.
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2012-07-06 13:51:50 +08:00
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2014-07-28 21:36:37 +08:00
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``LLVM_PACKAGE_VERSION``
|
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The LLVM version. This string can be used with CMake conditionals, e.g., ``if
|
2014-07-28 21:36:37 +08:00
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(${LLVM_PACKAGE_VERSION} VERSION_LESS "3.5")``.
|
2012-07-06 13:51:50 +08:00
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|
2014-07-28 21:36:37 +08:00
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``LLVM_TOOLS_BINARY_DIR``
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|
The path to the directory containing the LLVM tools (e.g. ``llvm-as``).
|
2012-07-06 13:51:50 +08:00
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|
2014-07-28 21:36:37 +08:00
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Notice that in the above example we link ``simple-tool`` against several LLVM
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|
libraries. The list of libraries is determined by using the
|
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|
``llvm_map_components_to_libnames()`` CMake function. For a list of available
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|
|
components look at the output of running ``llvm-config --components``.
|
2012-07-06 13:51:50 +08:00
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|
2014-07-28 21:36:37 +08:00
|
|
|
Note that for LLVM < 3.5 ``llvm_map_components_to_libraries()`` was
|
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|
|
used instead of ``llvm_map_components_to_libnames()``. This is now deprecated
|
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|
|
and will be removed in a future version of LLVM.
|
2012-07-06 13:51:50 +08:00
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|
2012-12-13 01:02:44 +08:00
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|
.. _cmake-out-of-source-pass:
|
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|
|
|
2014-07-28 21:36:37 +08:00
|
|
|
Developing LLVM passes out of source
|
|
|
|
------------------------------------
|
2012-07-06 13:51:50 +08:00
|
|
|
|
2014-07-28 21:36:37 +08:00
|
|
|
It is possible to develop LLVM passes out of LLVM's source tree (i.e. against an
|
|
|
|
installed or built LLVM). An example of a project layout is provided below.
|
2012-07-06 13:51:50 +08:00
|
|
|
|
2012-12-12 22:23:14 +08:00
|
|
|
.. code-block:: none
|
2012-07-06 13:51:50 +08:00
|
|
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|
|
|
|
<project dir>/
|
|
|
|
|
|
|
|
|
CMakeLists.txt
|
|
|
|
<pass name>/
|
|
|
|
|
|
|
|
|
CMakeLists.txt
|
|
|
|
Pass.cpp
|
|
|
|
...
|
|
|
|
|
|
|
|
Contents of ``<project dir>/CMakeLists.txt``:
|
|
|
|
|
|
|
|
.. code-block:: cmake
|
|
|
|
|
2014-07-28 21:36:37 +08:00
|
|
|
find_package(LLVM REQUIRED CONFIG)
|
2012-07-06 13:51:50 +08:00
|
|
|
|
|
|
|
add_definitions(${LLVM_DEFINITIONS})
|
|
|
|
include_directories(${LLVM_INCLUDE_DIRS})
|
|
|
|
|
|
|
|
add_subdirectory(<pass name>)
|
|
|
|
|
|
|
|
Contents of ``<project dir>/<pass name>/CMakeLists.txt``:
|
|
|
|
|
2014-07-28 21:36:37 +08:00
|
|
|
.. code-block:: cmake
|
|
|
|
|
|
|
|
add_library(LLVMPassname MODULE Pass.cpp)
|
|
|
|
|
|
|
|
Note if you intend for this pass to be merged into the LLVM source tree at some
|
|
|
|
point in the future it might make more sense to use LLVM's internal
|
2015-08-25 08:09:47 +08:00
|
|
|
``add_llvm_loadable_module`` function instead by...
|
2014-07-28 21:36:37 +08:00
|
|
|
|
|
|
|
|
|
|
|
Adding the following to ``<project dir>/CMakeLists.txt`` (after
|
|
|
|
``find_package(LLVM ...)``)
|
|
|
|
|
|
|
|
.. code-block:: cmake
|
|
|
|
|
|
|
|
list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_DIR}")
|
|
|
|
include(AddLLVM)
|
|
|
|
|
|
|
|
And then changing ``<project dir>/<pass name>/CMakeLists.txt`` to
|
|
|
|
|
2012-07-06 13:51:50 +08:00
|
|
|
.. code-block:: cmake
|
|
|
|
|
|
|
|
add_llvm_loadable_module(LLVMPassname
|
|
|
|
Pass.cpp
|
|
|
|
)
|
|
|
|
|
|
|
|
When you are done developing your pass, you may wish to integrate it
|
2015-08-25 08:09:47 +08:00
|
|
|
into the LLVM source tree. You can achieve it in two easy steps:
|
2012-07-06 13:51:50 +08:00
|
|
|
|
|
|
|
#. Copying ``<pass name>`` folder into ``<LLVM root>/lib/Transform`` directory.
|
|
|
|
|
|
|
|
#. Adding ``add_subdirectory(<pass name>)`` line into
|
|
|
|
``<LLVM root>/lib/Transform/CMakeLists.txt``.
|
|
|
|
|
2014-07-01 02:57:16 +08:00
|
|
|
Compiler/Platform-specific topics
|
2012-07-06 13:51:50 +08:00
|
|
|
=================================
|
|
|
|
|
|
|
|
Notes for specific compilers and/or platforms.
|
|
|
|
|
|
|
|
Microsoft Visual C++
|
|
|
|
--------------------
|
|
|
|
|
|
|
|
**LLVM_COMPILER_JOBS**:STRING
|
2015-08-25 08:09:47 +08:00
|
|
|
Specifies the maximum number of parallel compiler jobs to use per project
|
2013-07-24 01:44:01 +08:00
|
|
|
when building with msbuild or Visual Studio. Only supported for the Visual
|
|
|
|
Studio 2010 CMake generator. 0 means use all processors. Default is 0.
|