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merge with the LLVM_original
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 14:37:49 +0900
parents 95c75e76d11b
children 54457678186b
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1 ========================
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2 Creating an LLVM Project
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3 ========================
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4
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5 .. contents::
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6 :local:
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7
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8 Overview
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9 ========
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10
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11 The LLVM build system is designed to facilitate the building of third party
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12 projects that use LLVM header files, libraries, and tools. In order to use
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13 these facilities, a ``Makefile`` from a project must do the following things:
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14
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15 * Set ``make`` variables. There are several variables that a ``Makefile`` needs
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16 to set to use the LLVM build system:
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17
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18 * ``PROJECT_NAME`` - The name by which your project is known.
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19 * ``LLVM_SRC_ROOT`` - The root of the LLVM source tree.
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20 * ``LLVM_OBJ_ROOT`` - The root of the LLVM object tree.
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21 * ``PROJ_SRC_ROOT`` - The root of the project's source tree.
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22 * ``PROJ_OBJ_ROOT`` - The root of the project's object tree.
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23 * ``PROJ_INSTALL_ROOT`` - The root installation directory.
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24 * ``LEVEL`` - The relative path from the current directory to the
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25 project's root ``($PROJ_OBJ_ROOT)``.
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26
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27 * Include ``Makefile.config`` from ``$(LLVM_OBJ_ROOT)``.
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28
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29 * Include ``Makefile.rules`` from ``$(LLVM_SRC_ROOT)``.
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30
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31 There are two ways that you can set all of these variables:
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32
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33 * You can write your own ``Makefiles`` which hard-code these values.
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34
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35 * You can use the pre-made LLVM sample project. This sample project includes
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36 ``Makefiles``, a configure script that can be used to configure the location
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37 of LLVM, and the ability to support multiple object directories from a single
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38 source directory.
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39
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40 This document assumes that you will base your project on the LLVM sample project
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41 found in ``llvm/projects/sample``. If you want to devise your own build system,
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42 studying the sample project and LLVM ``Makefiles`` will probably provide enough
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43 information on how to write your own ``Makefiles``.
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44
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45 Create a Project from the Sample Project
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46 ========================================
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47
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48 Follow these simple steps to start your project:
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49
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50 1. Copy the ``llvm/projects/sample`` directory to any place of your choosing.
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51 You can place it anywhere you like. Rename the directory to match the name
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52 of your project.
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53
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54 2. If you downloaded LLVM using Subversion, remove all the directories named
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55 ``.svn`` (and all the files therein) from your project's new source tree.
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56 This will keep Subversion from thinking that your project is inside
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57 ``llvm/trunk/projects/sample``.
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58
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59 3. Add your source code and Makefiles to your source tree.
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60
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61 4. If you want your project to be configured with the ``configure`` script then
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62 you need to edit ``autoconf/configure.ac`` as follows:
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63
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64 * **AC_INIT** - Place the name of your project, its version number and a
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65 contact email address for your project as the arguments to this macro
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66
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67 * **AC_CONFIG_AUX_DIR** - If your project isn't in the ``llvm/projects``
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68 directory then you might need to adjust this so that it specifies a
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69 relative path to the ``llvm/autoconf`` directory.
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70
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71 * **LLVM_CONFIG_PROJECT** - Just leave this alone.
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72
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73 * **AC_CONFIG_SRCDIR** - Specify a path to a file name that identifies your
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74 project; or just leave it at ``Makefile.common.in``.
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75
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76 * **AC_CONFIG_FILES** - Do not change.
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77
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78 * **AC_CONFIG_MAKEFILE** - Use one of these macros for each Makefile that
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79 your project uses. This macro arranges for your makefiles to be copied from
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80 the source directory, unmodified, to the build directory.
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81
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82 5. After updating ``autoconf/configure.ac``, regenerate the configure script
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83 with these commands. (You must be using ``Autoconf`` version 2.59 or later
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84 and your ``aclocal`` version should be 1.9 or later.)
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85
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86 .. code-block:: bash
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87
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88 % cd autoconf
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89 % ./AutoRegen.sh
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90
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91 6. Run ``configure`` in the directory in which you want to place object code.
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92 Use the following options to tell your project where it can find LLVM:
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93
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94 ``--with-llvmsrc=<directory>``
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95 Tell your project where the LLVM source tree is located.
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96
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97 ``--with-llvmobj=<directory>``
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98 Tell your project where the LLVM object tree is located.
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99
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100 ``--prefix=<directory>``
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101 Tell your project where it should get installed.
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102
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103 That's it! Now all you have to do is type ``gmake`` (or ``make`` if you're on a
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104 GNU/Linux system) in the root of your object directory, and your project should
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105 build.
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106
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107 Source Tree Layout
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108 ==================
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109
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110 In order to use the LLVM build system, you will want to organize your source
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111 code so that it can benefit from the build system's features. Mainly, you want
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112 your source tree layout to look similar to the LLVM source tree layout. The
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113 best way to do this is to just copy the project tree from
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114 ``llvm/projects/sample`` and modify it to meet your needs, but you can certainly
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115 add to it if you want.
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116
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117 Underneath your top level directory, you should have the following directories:
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118
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119 **lib**
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120
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121 This subdirectory should contain all of your library source code. For each
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122 library that you build, you will have one directory in **lib** that will
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123 contain that library's source code.
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124
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125 Libraries can be object files, archives, or dynamic libraries. The **lib**
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126 directory is just a convenient place for libraries as it places them all in
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127 a directory from which they can be linked later.
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128
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129 **include**
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130
95c75e76d11b LLVM 3.4
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131 This subdirectory should contain any header files that are global to your
95c75e76d11b LLVM 3.4
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132 project. By global, we mean that they are used by more than one library or
95c75e76d11b LLVM 3.4
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133 executable of your project.
95c75e76d11b LLVM 3.4
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134
95c75e76d11b LLVM 3.4
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135 By placing your header files in **include**, they will be found
95c75e76d11b LLVM 3.4
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136 automatically by the LLVM build system. For example, if you have a file
95c75e76d11b LLVM 3.4
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137 **include/jazz/note.h**, then your source files can include it simply with
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138 **#include "jazz/note.h"**.
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139
95c75e76d11b LLVM 3.4
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140 **tools**
95c75e76d11b LLVM 3.4
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141
95c75e76d11b LLVM 3.4
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142 This subdirectory should contain all of your source code for executables.
95c75e76d11b LLVM 3.4
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143 For each program that you build, you will have one directory in **tools**
95c75e76d11b LLVM 3.4
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diff changeset
144 that will contain that program's source code.
95c75e76d11b LLVM 3.4
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diff changeset
145
95c75e76d11b LLVM 3.4
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146 **test**
95c75e76d11b LLVM 3.4
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diff changeset
147
95c75e76d11b LLVM 3.4
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148 This subdirectory should contain tests that verify that your code works
95c75e76d11b LLVM 3.4
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149 correctly. Automated tests are especially useful.
95c75e76d11b LLVM 3.4
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diff changeset
150
95c75e76d11b LLVM 3.4
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151 Currently, the LLVM build system provides basic support for tests. The LLVM
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152 system provides the following:
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153
95c75e76d11b LLVM 3.4
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154 * LLVM contains regression tests in ``llvm/test``. These tests are run by the
95c75e76d11b LLVM 3.4
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155 :doc:`Lit <CommandGuide/lit>` testing tool. This test procedure uses ``RUN``
95c75e76d11b LLVM 3.4
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parents:
diff changeset
156 lines in the actual test case to determine how to run the test. See the
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157 :doc:`TestingGuide` for more details.
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158
95c75e76d11b LLVM 3.4
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159 * LLVM contains an optional package called ``llvm-test``, which provides
95c75e76d11b LLVM 3.4
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160 benchmarks and programs that are known to compile with the Clang front
95c75e76d11b LLVM 3.4
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161 end. You can use these programs to test your code, gather statistical
95c75e76d11b LLVM 3.4
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parents:
diff changeset
162 information, and compare it to the current LLVM performance statistics.
95c75e76d11b LLVM 3.4
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diff changeset
163
95c75e76d11b LLVM 3.4
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diff changeset
164 Currently, there is no way to hook your tests directly into the ``llvm/test``
95c75e76d11b LLVM 3.4
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parents:
diff changeset
165 testing harness. You will simply need to find a way to use the source
95c75e76d11b LLVM 3.4
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parents:
diff changeset
166 provided within that directory on your own.
95c75e76d11b LLVM 3.4
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parents:
diff changeset
167
95c75e76d11b LLVM 3.4
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168 Typically, you will want to build your **lib** directory first followed by your
95c75e76d11b LLVM 3.4
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parents:
diff changeset
169 **tools** directory.
95c75e76d11b LLVM 3.4
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170
95c75e76d11b LLVM 3.4
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171 Writing LLVM Style Makefiles
95c75e76d11b LLVM 3.4
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172 ============================
95c75e76d11b LLVM 3.4
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173
95c75e76d11b LLVM 3.4
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174 The LLVM build system provides a convenient way to build libraries and
95c75e76d11b LLVM 3.4
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diff changeset
175 executables. Most of your project Makefiles will only need to define a few
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
176 variables. Below is a list of the variables one can set and what they can
95c75e76d11b LLVM 3.4
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177 do:
95c75e76d11b LLVM 3.4
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178
95c75e76d11b LLVM 3.4
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179 Required Variables
95c75e76d11b LLVM 3.4
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180 ------------------
95c75e76d11b LLVM 3.4
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181
95c75e76d11b LLVM 3.4
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diff changeset
182 ``LEVEL``
95c75e76d11b LLVM 3.4
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diff changeset
183
95c75e76d11b LLVM 3.4
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diff changeset
184 This variable is the relative path from this ``Makefile`` to the top
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185 directory of your project's source code. For example, if your source code
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
186 is in ``/tmp/src``, then the ``Makefile`` in ``/tmp/src/jump/high``
95c75e76d11b LLVM 3.4
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parents:
diff changeset
187 would set ``LEVEL`` to ``"../.."``.
95c75e76d11b LLVM 3.4
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diff changeset
188
95c75e76d11b LLVM 3.4
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diff changeset
189 Variables for Building Subdirectories
95c75e76d11b LLVM 3.4
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diff changeset
190 -------------------------------------
95c75e76d11b LLVM 3.4
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diff changeset
191
95c75e76d11b LLVM 3.4
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diff changeset
192 ``DIRS``
95c75e76d11b LLVM 3.4
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diff changeset
193
95c75e76d11b LLVM 3.4
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diff changeset
194 This is a space separated list of subdirectories that should be built. They
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
195 will be built, one at a time, in the order specified.
95c75e76d11b LLVM 3.4
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diff changeset
196
95c75e76d11b LLVM 3.4
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diff changeset
197 ``PARALLEL_DIRS``
95c75e76d11b LLVM 3.4
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diff changeset
198
95c75e76d11b LLVM 3.4
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199 This is a list of directories that can be built in parallel. These will be
95c75e76d11b LLVM 3.4
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diff changeset
200 built after the directories in DIRS have been built.
95c75e76d11b LLVM 3.4
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parents:
diff changeset
201
95c75e76d11b LLVM 3.4
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diff changeset
202 ``OPTIONAL_DIRS``
95c75e76d11b LLVM 3.4
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parents:
diff changeset
203
95c75e76d11b LLVM 3.4
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diff changeset
204 This is a list of directories that can be built if they exist, but will not
95c75e76d11b LLVM 3.4
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parents:
diff changeset
205 cause an error if they do not exist. They are built serially in the order
95c75e76d11b LLVM 3.4
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parents:
diff changeset
206 in which they are listed.
95c75e76d11b LLVM 3.4
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diff changeset
207
95c75e76d11b LLVM 3.4
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diff changeset
208 Variables for Building Libraries
95c75e76d11b LLVM 3.4
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diff changeset
209 --------------------------------
95c75e76d11b LLVM 3.4
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diff changeset
210
95c75e76d11b LLVM 3.4
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parents:
diff changeset
211 ``LIBRARYNAME``
95c75e76d11b LLVM 3.4
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diff changeset
212
95c75e76d11b LLVM 3.4
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diff changeset
213 This variable contains the base name of the library that will be built. For
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
214 example, to build a library named ``libsample.a``, ``LIBRARYNAME`` should
95c75e76d11b LLVM 3.4
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diff changeset
215 be set to ``sample``.
95c75e76d11b LLVM 3.4
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parents:
diff changeset
216
95c75e76d11b LLVM 3.4
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parents:
diff changeset
217 ``BUILD_ARCHIVE``
95c75e76d11b LLVM 3.4
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parents:
diff changeset
218
95c75e76d11b LLVM 3.4
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diff changeset
219 By default, a library is a ``.o`` file that is linked directly into a
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
220 program. To build an archive (also known as a static library), set the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
221 ``BUILD_ARCHIVE`` variable.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
222
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
223 ``SHARED_LIBRARY``
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
224
95c75e76d11b LLVM 3.4
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diff changeset
225 If ``SHARED_LIBRARY`` is defined in your Makefile, a shared (or dynamic)
95c75e76d11b LLVM 3.4
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parents:
diff changeset
226 library will be built.
95c75e76d11b LLVM 3.4
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diff changeset
227
95c75e76d11b LLVM 3.4
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parents:
diff changeset
228 Variables for Building Programs
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
229 -------------------------------
95c75e76d11b LLVM 3.4
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diff changeset
230
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
231 ``TOOLNAME``
95c75e76d11b LLVM 3.4
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parents:
diff changeset
232
95c75e76d11b LLVM 3.4
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parents:
diff changeset
233 This variable contains the name of the program that will be built. For
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
234 example, to build an executable named ``sample``, ``TOOLNAME`` should be set
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
235 to ``sample``.
95c75e76d11b LLVM 3.4
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parents:
diff changeset
236
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
237 ``USEDLIBS``
95c75e76d11b LLVM 3.4
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parents:
diff changeset
238
95c75e76d11b LLVM 3.4
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parents:
diff changeset
239 This variable holds a space separated list of libraries that should be
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
240 linked into the program. These libraries must be libraries that come from
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 your **lib** directory. The libraries must be specified without their
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 ``lib`` prefix. For example, to link ``libsample.a``, you would set
95c75e76d11b LLVM 3.4
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parents:
diff changeset
243 ``USEDLIBS`` to ``sample.a``.
95c75e76d11b LLVM 3.4
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parents:
diff changeset
244
95c75e76d11b LLVM 3.4
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parents:
diff changeset
245 Note that this works only for statically linked libraries.
95c75e76d11b LLVM 3.4
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parents:
diff changeset
246
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
247 ``LLVMLIBS``
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
248
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
249 This variable holds a space separated list of libraries that should be
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
250 linked into the program. These libraries must be LLVM libraries. The
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
251 libraries must be specified without their ``lib`` prefix. For example, to
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
252 link with a driver that performs an IR transformation you might set
95c75e76d11b LLVM 3.4
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parents:
diff changeset
253 ``LLVMLIBS`` to this minimal set of libraries ``LLVMSupport.a LLVMCore.a
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
254 LLVMBitReader.a LLVMAsmParser.a LLVMAnalysis.a LLVMTransformUtils.a
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
255 LLVMScalarOpts.a LLVMTarget.a``.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
256
95c75e76d11b LLVM 3.4
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parents:
diff changeset
257 Note that this works only for statically linked libraries. LLVM is split
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
258 into a large number of static libraries, and the list of libraries you
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
259 require may be much longer than the list above. To see a full list of
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
260 libraries use: ``llvm-config --libs all``. Using ``LINK_COMPONENTS`` as
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
261 described below, obviates the need to set ``LLVMLIBS``.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
262
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263 ``LINK_COMPONENTS``
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264
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265 This variable holds a space separated list of components that the LLVM
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266 ``Makefiles`` pass to the ``llvm-config`` tool to generate a link line for
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267 the program. For example, to link with all LLVM libraries use
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268 ``LINK_COMPONENTS = all``.
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269
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270 ``LIBS``
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271
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272 To link dynamic libraries, add ``-l<library base name>`` to the ``LIBS``
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273 variable. The LLVM build system will look in the same places for dynamic
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274 libraries as it does for static libraries.
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275
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276 For example, to link ``libsample.so``, you would have the following line in
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277 your ``Makefile``:
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278
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279 .. code-block:: makefile
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280
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281 LIBS += -lsample
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282
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283 Note that ``LIBS`` must occur in the Makefile after the inclusion of
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284 ``Makefile.common``.
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285
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286 Miscellaneous Variables
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287 -----------------------
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288
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289 ``CFLAGS`` & ``CPPFLAGS``
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290
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291 This variable can be used to add options to the C and C++ compiler,
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292 respectively. It is typically used to add options that tell the compiler
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293 the location of additional directories to search for header files.
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294
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295 It is highly suggested that you append to ``CFLAGS`` and ``CPPFLAGS`` as
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296 opposed to overwriting them. The master ``Makefiles`` may already have
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297 useful options in them that you may not want to overwrite.
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298
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299 Placement of Object Code
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300 ========================
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301
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302 The final location of built libraries and executables will depend upon whether
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303 you do a ``Debug``, ``Release``, or ``Profile`` build.
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304
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305 Libraries
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306
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307 All libraries (static and dynamic) will be stored in
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308 ``PROJ_OBJ_ROOT/<type>/lib``, where *type* is ``Debug``, ``Release``, or
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309 ``Profile`` for a debug, optimized, or profiled build, respectively.
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310
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311 Executables
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312
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313 All executables will be stored in ``PROJ_OBJ_ROOT/<type>/bin``, where *type*
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314 is ``Debug``, ``Release``, or ``Profile`` for a debug, optimized, or
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315 profiled build, respectively.
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316
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317 Further Help
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318 ============
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319
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320 If you have any questions or need any help creating an LLVM project, the LLVM
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321 team would be more than happy to help. You can always post your questions to
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322 the `LLVM Developers Mailing List
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323 <http://lists.cs.uiuc.edu/pipermail/llvmdev/>`_.