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author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Sun, 31 Jan 2016 17:34:49 +0900
parents 95c75e76d11b
children 1172e4bd9c6f
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1 ===================================================================
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2 How To Cross-Compile Clang/LLVM using Clang/LLVM
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3 ===================================================================
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4
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5 Introduction
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6 ============
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7
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8 This document contains information about building LLVM and
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9 Clang on host machine, targeting another platform.
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10
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11 For more information on how to use Clang as a cross-compiler,
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12 please check http://clang.llvm.org/docs/CrossCompilation.html.
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13
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14 TODO: Add MIPS and other platforms to this document.
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15
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16 Cross-Compiling from x86_64 to ARM
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17 ==================================
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18
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19 In this use case, we'll be using CMake and Ninja, on a Debian-based Linux
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20 system, cross-compiling from an x86_64 host (most Intel and AMD chips
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21 nowadays) to a hard-float ARM target (most ARM targets nowadays).
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22
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23 The packages you'll need are:
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24
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25 * ``cmake``
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26 * ``ninja-build`` (from backports in Ubuntu)
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27 * ``gcc-4.7-arm-linux-gnueabihf``
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28 * ``gcc-4.7-multilib-arm-linux-gnueabihf``
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29 * ``binutils-arm-linux-gnueabihf``
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30 * ``libgcc1-armhf-cross``
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31 * ``libsfgcc1-armhf-cross``
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32 * ``libstdc++6-armhf-cross``
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33 * ``libstdc++6-4.7-dev-armhf-cross``
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34
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35 Configuring CMake
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36 -----------------
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37
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38 For more information on how to configure CMake for LLVM/Clang,
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39 see :doc:`CMake`.
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40
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41 The CMake options you need to add are:
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42 * ``-DCMAKE_CROSSCOMPILING=True``
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43 * ``-DCMAKE_INSTALL_PREFIX=<install-dir>``
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44 * ``-DLLVM_TABLEGEN=<path-to-host-bin>/llvm-tblgen``
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45 * ``-DCLANG_TABLEGEN=<path-to-host-bin>/clang-tblgen``
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46 * ``-DLLVM_DEFAULT_TARGET_TRIPLE=arm-linux-gnueabihf``
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47 * ``-DLLVM_TARGET_ARCH=ARM``
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48 * ``-DLLVM_TARGETS_TO_BUILD=ARM``
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49 * ``-DCMAKE_CXX_FLAGS='-target armv7a-linux-gnueabihf -mcpu=cortex-a9 -I/usr/arm-linux-gnueabihf/include/c++/4.7.2/arm-linux-gnueabihf/ -I/usr/arm-linux-gnueabihf/include/ -mfloat-abi=hard -ccc-gcc-name arm-linux-gnueabihf-gcc'``
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50
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51 The TableGen options are required to compile it with the host compiler,
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52 so you'll need to compile LLVM (or at least ``llvm-tblgen``) to your host
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53 platform before you start. The CXX flags define the target, cpu (which
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54 defaults to ``fpu=VFP3`` with NEON), and forcing the hard-float ABI. If you're
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55 using Clang as a cross-compiler, you will *also* have to set ``-ccc-gcc-name``,
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56 to make sure it picks the correct linker.
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57
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58 Most of the time, what you want is to have a native compiler to the
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59 platform itself, but not others. It might not even be feasible to
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60 produce x86 binaries from ARM targets, so there's no point in compiling
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61 all back-ends. For that reason, you should also set the
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62 ``TARGETS_TO_BUILD`` to only build the ARM back-end.
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63
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64 You must set the ``CMAKE_INSTALL_PREFIX``, otherwise a ``ninja install``
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65 will copy ARM binaries to your root filesystem, which is not what you
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66 want.
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67
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68 Hacks
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69 -----
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70
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71 There are some bugs in current LLVM, which require some fiddling before
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72 running CMake:
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73
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74 #. If you're using Clang as the cross-compiler, there is a problem in
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75 the LLVM ARM back-end that is producing absolute relocations on
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76 position-independent code (``R_ARM_THM_MOVW_ABS_NC``), so for now, you
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77 should disable PIC:
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78
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79 .. code-block:: bash
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80
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81 -DLLVM_ENABLE_PIC=False
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82
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83 This is not a problem, since Clang/LLVM libraries are statically
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84 linked anyway, it shouldn't affect much.
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85
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86 #. The ARM libraries won't be installed in your system, and possibly
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87 not easily installable anyway, so you'll have to build/download
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88 them separately. But the CMake prepare step, which checks for
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89 dependencies, will check the *host* libraries, not the *target*
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90 ones.
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91
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92 A quick way of getting the libraries is to download them from
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93 a distribution repository, like Debian (http://packages.debian.org/wheezy/),
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94 and download the missing libraries. Note that the ``libXXX``
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95 will have the shared objects (``.so``) and the ``libXXX-dev`` will
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96 give you the headers and the static (``.a``) library. Just in
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97 case, download both.
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98
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99 The ones you need for ARM are: ``libtinfo``, ``zlib1g``,
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100 ``libxml2`` and ``liblzma``. In the Debian repository you'll
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101 find downloads for all architectures.
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102
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103 After you download and unpack all ``.deb`` packages, copy all
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104 ``.so`` and ``.a`` to a directory, make the appropriate
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105 symbolic links (if necessary), and add the relevant ``-L``
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106 and ``-I`` paths to ``-DCMAKE_CXX_FLAGS`` above.
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107
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108
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109 Running CMake and Building
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110 --------------------------
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111
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112 Finally, if you're using your platform compiler, run:
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113
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114 .. code-block:: bash
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115
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116 $ cmake -G Ninja <source-dir> <options above>
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117
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118 If you're using Clang as the cross-compiler, run:
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119
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120 .. code-block:: bash
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121
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122 $ CC='clang' CXX='clang++' cmake -G Ninja <source-dir> <options above>
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123
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124 If you have ``clang``/``clang++`` on the path, it should just work, and special
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125 Ninja files will be created in the build directory. I strongly suggest
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126 you to run ``cmake`` on a separate build directory, *not* inside the
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127 source tree.
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128
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129 To build, simply type:
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130
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131 .. code-block:: bash
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132
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133 $ ninja
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134
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135 It should automatically find out how many cores you have, what are
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136 the rules that needs building and will build the whole thing.
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137
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138 You can't run ``ninja check-all`` on this tree because the created
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139 binaries are targeted to ARM, not x86_64.
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140
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141 Installing and Using
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142 --------------------
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143
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144 After the LLVM/Clang has built successfully, you should install it
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145 via:
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146
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147 .. code-block:: bash
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148
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149 $ ninja install
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150
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151 which will create a sysroot on the install-dir. You can then tar
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152 that directory into a binary with the full triple name (for easy
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153 identification), like:
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154
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155 .. code-block:: bash
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156
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157 $ ln -sf <install-dir> arm-linux-gnueabihf-clang
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158 $ tar zchf arm-linux-gnueabihf-clang.tar.gz arm-linux-gnueabihf-clang
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159
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160 If you copy that tarball to your target board, you'll be able to use
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161 it for running the test-suite, for example. Follow the guidelines at
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162 http://llvm.org/docs/lnt/quickstart.html, unpack the tarball in the
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163 test directory, and use options:
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164
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165 .. code-block:: bash
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166
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167 $ ./sandbox/bin/python sandbox/bin/lnt runtest nt \
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168 --sandbox sandbox \
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169 --test-suite `pwd`/test-suite \
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170 --cc `pwd`/arm-linux-gnueabihf-clang/bin/clang \
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171 --cxx `pwd`/arm-linux-gnueabihf-clang/bin/clang++
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172
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173 Remember to add the ``-jN`` options to ``lnt`` to the number of CPUs
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174 on your board. Also, the path to your clang has to be absolute, so
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175 you'll need the `pwd` trick above.