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1 .. _compiling:
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2
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3 Compiling Orthanc
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4 =================
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5
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6 Under Linux
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7 -----------
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8
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9 * Orthanc >= 0.7.1: See the `build instructions
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10 <https://bitbucket.org/sjodogne/orthanc/src/default/LinuxCompilation.txt>`_
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11 inside the source package.
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12 * Orthanc <= 0.7.0: See the :ref:`compiling-old`.
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13
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14 Under Microsoft Windows
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15 -----------------------
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16
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17 See the `build instructions for Windows
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18 <https://bitbucket.org/sjodogne/orthanc/src/default/INSTALL>`_ inside
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19 the source package.
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20
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21 Under OS X
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22 ----------
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23
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24 The mainline of Orthanc can compile under Apple OS X, with the XCode
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25 compiler, since June 24th, 2014. See the `build instructions for
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26 Darwin
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27 <https://bitbucket.org/sjodogne/orthanc/src/default/DarwinCompilation.txt>`_
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28 inside the source package.
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29
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30
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31 Please explain the build infrastructure
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32 ---------------------------------------
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33
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34 The build infrastructure of Orthanc is based upon `CMake
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35 <http://www.cmake.org/>`_. The build scripts are designed to embed all
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36 the third-party dependencies directly inside the Orthanc
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37 executable. This is the meaning of the ``-DSTATIC_BUILD=TRUE`` option,
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38 as described in the `INSTALL
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39 <http://orthanc.googlecode.com/hg/INSTALL>`_ file of Orthanc.
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40
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41 Such a static linking is very desirable under Windows, since the
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42 Orthanc binaries do not depend on any external DLL, which results in a
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43 straightforward installation procedure (just download the Windows
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44 binaries and execute them), which eases the setup of the development
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45 machines (no external library is to be manually installed, everything
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46 is downloaded during the build configuration), and which avoids the
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47 `DLL hell <http://en.wikipedia.org/wiki/Dll_hell>`_. As a downside,
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48 this makes our build infrastructure rather complex.
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49
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50 Static linking is not as desirable under Linux than under
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51 Windows. Linux prefers software that dynamically links against the
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52 system-wide libraries: This is explained by the fact that whenever a
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53 third-party dependency benefits from a bugfix, any software that is
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54 linked against it also immediately benefits from this fix. This also
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55 reduces the size of the binaries as well as the build time. Under
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56 Linux, it is thus recommended to use the ``-DSTATIC_BUILD=FALSE``
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57 option whenever possible.
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58
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59 When the dynamic build is used, some third-party dependencies may be
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60 unavailable or incompatible with Orthanc, depending on your Linux
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61 distribution. Some CMake options have thus been introduced to force
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62 the static linking against some individual third-party
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63 dependencies. Here are the most useful:
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64
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65 * ``-DUSE_SYSTEM_DCMTK=FALSE`` to statically link against DCMTK.
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66 * ``-DUSE_SYSTEM_JSONCPP=FALSE`` to statically link against JsonCpp.
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67
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68 You will also have to set the ``-DALLOW_DOWNLOADS=TRUE`` to
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69 explicitely allow the CMake script to download the source code of any
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70 required dependency. The source code of all these dependencies is
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71 self-hosted on our servers at the University Hospital of Liège.
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72
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73 Please also note that the option ``-DSTANDALONE_BUILD=TRUE`` must be
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74 used whenever your plan to move the binaries or to install them on
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75 another computer. This option will embed all the external resource
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76 files (notably Orthanc Explorer) into the resulting executable. If
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77 this option is set to ``FALSE``, the resources will be read from the
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78 source directories.
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79
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80
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81 Missing ``uuid-dev`` package
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82 ----------------------------
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83
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84 Orthanc might fail to compile, complaining about missing ``uuid-dev`` package.
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85
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86 This problem seems to occur when fist building Orthanc without the
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87 ``uuid-dev`` package installed, then installing ``uuid-dev``, then
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88 rebuilding Orthanc. It seems that the build scripts do not update the
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89 cached variable about the presence of ``uuid-dev``.
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90
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91 To solve this problem, `as reported
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92 <https://groups.google.com/d/msg/orthanc-users/hQYulBBvJvs/S1Pm125o59gJ>`_
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93 by Peter Somlo, it is necessary to entirely remove the build directory
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94 (e.g. with ``rm -rf Build``) and start again the build from a fresh
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95 directory.
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