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BUILDING WITH CMAKE

CMake  must  be  run to generate a build system for this project.
The build system may be placed either in the project source  tree
(an  in-source  build)  or  in a separate binary tree (an out-of-
source build). We strongly encourage use of out-of-source  builds
because  they make it easy to have multiple builds with different
configurations sharing the same source tree. Once  a  single  in-
source  build has been created it is the only build tree that can
be associated with that source tree. A source  tree  may  not  be
used  both for an in-source build and an out-of-source build, but
any number of out-of-source builds may share a source  tree  that
does  not  have an in-source build. Having multiple out-of-source
builds is particularly useful for installing this project on mul-
tiple  architectures using a single source tree on a shared disk.

CMake provides both a command-line tool  and  interactive  inter-
faces.  Advanced  users may wish to use the command-line tool but
here we document the CMake interactive interface for  each  plat-
form:

* UNIX / Cygwin / Mac OSX

CMake should be run from the command line on these platforms. The
current working directory should be set  to  the  desired  binary
tree  location in which the build system should be generated. One
command-line argument is used to  specify  the  location  of  the
source  tree. CMake will usually choose the system C and C++ com-
pilers automatically but it can be told to use specific compilers
through the "CC" and "CXX" environment variables.

A typical in-source build for this project might look like this:

  $ ls -d PROJECT_DIR
  PROJECT_DIR/
  $ cd PROJECT_DIR
  $ ccmake .
  $ make

A  typical  out-of-source  build for this project might look like
this:

  $ ls -d PROJECT_DIR
  PROJECT_DIR/
  $ cd PROJECT_DIR
  $ mkdir build
  $ cd build
  $ ccmake ../
  $ make

In the above example, the call to ccmake may be replaced by

  $ CC=/your/c/compiler CXX=/your/C++/compiler ccmake ../

in  order to tell CMake to use specific C and C++ compilers. Set-
ting the environment in this way will only change  the  compilers
the first time CMake is run for a specific build tree. Do not at-
tempt to change the compiler of an existing build  tree.  Instead
one  should create a separate build tree for each desired compil-
er.

The ccmake tool is a curses-based dialog that may be used to  in-
teractively  configure this project. When it appears press 'c' on
the keyboard to run the initial configuration of the  build  sys-
tem. Eventually a set of configuration options will appear. These
may be edited using the arrow-keys and the ENTER key for  naviga-
tion.  See  below for details on the meaning of each of these op-
tions.

Once the options have been set as desired press 'c' again to  re-
configure.  New  options  may appear when earlier options are ad-
justed. Keep adjusting options and pressing 'c' until the desired
configuration  is reached. Finally press 'g' to actually generate
the build system. Now that the build system  has  been  generated
just run make to build the project.

NOTE: The ccmake curses dialog is the most commonly used interac-
tive interface for CMake on UNIX-like  platforms,  so  these  in-
structions  assume  it  is available.  Some system administrators
may not have installed curses in which case ccmake  will  not  be
available.  On these platforms one may use the command "cmake -i"
in place of ccmake and follow the on-screen instructions to  con-
figure the build. A last resort is to use the command-line inter-
face to cmake. See the CMake documentation for further details.

* Windows

Run the CMakeSetup dialog to get started.  It  must  be  executed
from an environment configured to run the compiler to be used. In
the case of the Visual Studio IDE no special environment is need-
ed  and CMakeSetup can be started from its icon. In the case of a
Visual Studio NMake, Borland C++, or MinGW build  the  CMakeSetup
dialog  should  be executed from a command prompt with the appro-
priate environment set.

The dialog prompts for the location  of  the  source  and  binary
trees. There may also be prompt for the build system generator to
be used ("Build For:"). Once these are set then  CMake  is  ready
for a first pass at configuring the project build system. Use the
"Configure" button to initiate this process. If there was no ear-
lier prompt for the build system generator a separate dialog will
appear during the first configuration step to prompt for  genera-
tor  selection.  After  a  while the dialog will present a set of
configuration options. See below for details on  the  meaning  of
each of these options. After setting the options as desired press
"Configure"  again  to  make  another  pass  at  configuring  the
project.  New options may appear when earlier options are adjust-
ed. Keep adjusting options and pressing "Configure" until the de-
sired configuration is reached. Finally press the "Generate" but-
ton to actually generate the build system.

Now that the build system has been  generated  the  corresponding
native  tools  can  be used to build this project. In the case of
the Visual Studio IDE simply run it and load the workspace or so-
lution file from the binary tree specified in the CMakeSetup dia-
log. Select and build the ALL_BUILD target. In the case of a  Vi-
sual  Studio  NMake,  Borland  C++, or MinGW build use the corre-
sponding make tool (nmake, make, and make, respectively) from the
command line.

CONFIGURATION OPTIONS IN CMAKE

* CMAKE_BUILD_TYPE

Specifies  the  build type for the project. Possible  values  are
empty, Debug, Release, RelWithDebInfo and MinSizeRel.

* CMAKE_INSTALL_PREFIX

When  this  project is installed all files are placed in a direc-
tory structure rooted at the  directory  specified  by  CMAKE_IN-
STALL_PREFIX.

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