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<title>Creating your own projects using CMake</title>
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<div class="title">Creating your own projects using CMake </div> </div>
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<div class="textblock"><p>CMake provides modules to find a large number of modules to find common dependencies. A module to find openbabel is included in the release or can be copied below. The filename of modules to find packages must start with Find. For example, the default filename for the openbabel module is FindOpenBabel2.cmake. This file is usually placed in the cmake/modules directory of your project. This path must be specified by setting the CMAKE_MODULE_PATH variable. Next, calling find_package will execute the module to find openbabel and set 3 variables.</p>
<ul>
<li>OPENBABEL2_FOUND </li>
<li>OPENBABEL2_INCLUDE_DIR </li>
<li>OPENBABEL2_LIBRARIES</li>
</ul>
<p>The find_package command allows you to specify the package is required and cmake will handle this further. If openbabel is optional, the first variable can be used in your cmake logic to optionally build the additional code. Since find_package only sets variables, you still need to call include_directories with OPENBABEL2_INCLUDE_DIR in the argument list. The OPENBABEL2_LIBRARIES variable can be used directly in your target_link_libraries command.</p>
<p>Below is a minimal but working example of a project. For simplicity, only one CMakeLists.txt file and one source file is used. This can be used as a template to get started. The <a href="http://www.cmake.org/cmake/help/documentation.html">cmake documentation</a> can be consultated as your project becomes more complex.</p>
<p><b>CMakeLists.txt</b> </p>
<div class="fragment"><pre class="fragment"><span class="preprocessor"># this line is required for cmake backwards compatibility</span>
<span class="preprocessor"></span>cmake_minimum_required(VERSION 2.6)
<span class="preprocessor"># name of your project</span>
<span class="preprocessor"></span>project(myproject)
<span class="preprocessor"># set the module path</span>
<span class="preprocessor"></span><span class="keyword">set</span>(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/modules)
# find and setup openbabel
find_package(OpenBabel2 REQUIRED)
include_directories(${OPENBABEL2_INCLUDE_DIR})
# create a list of source files (easier to maintain)
<span class="keyword">set</span>(sources main.cpp)
# the executable
add_executable(myexe ${sources})
target_link_libraries(myexe ${OPENBABEL2_LIBRARIES})
install(TARGETS myexe DESTINATION bin)
</pre></div><p> <b>main.cpp</b> </p>
<div class="fragment"><pre class="fragment"><span class="preprocessor">#include <<a class="code" href="mol_8h.shtml" title="Handle molecules. Declarations of OBMol, OBAtom, OBBond, OBResidue. (the main header for Open Babel)...">openbabel/mol.h</a>></span>
<span class="keyword">using namespace </span>OpenBabel;
<span class="keywordtype">int</span> main()
{
<a class="code" href="classOpenBabel_1_1OBMol.shtml" title="Molecule Class.">OBMol</a> mol;
<span class="comment">// ... see examples for code ...</span>
<span class="keywordflow">return</span> 0;
}
</pre></div><p><b>cmake/modules/FindOpenBabel2.cmake</b> </p>
<div class="fragment"><pre class="fragment"><span class="preprocessor"># - Try to find OpenBabel2</span>
<span class="preprocessor"></span><span class="preprocessor"># Once done this will define</span>
<span class="preprocessor"></span><span class="preprocessor">#</span>
<span class="preprocessor"></span><span class="preprocessor"># OPENBABEL2_FOUND - system has OpenBabel2</span>
<span class="preprocessor"></span><span class="preprocessor"># OPENBABEL2_INCLUDE_DIR - the OpenBabel2 include directory</span>
<span class="preprocessor"></span><span class="preprocessor"># OPENBABEL2_LIBRARIES - Link these to use OpenBabel2</span>
<span class="preprocessor"></span><span class="preprocessor">#</span>
<span class="preprocessor"></span><span class="preprocessor"># Copyright (c) 2006, 2007 Carsten Niehaus, <cniehaus@gmx.de></span>
<span class="preprocessor"></span><span class="preprocessor"># Copyright (C) 2008 Marcus D. Hanwell <marcus@cryos.org></span>
<span class="preprocessor"></span><span class="preprocessor"># Redistribution and use is allowed according to the terms of the BSD license.</span>
<span class="preprocessor"></span><span class="preprocessor"># For details see the accompanying COPYING-CMAKE-SCRIPTS file.</span>
<span class="preprocessor"></span>
<span class="keywordflow">if</span> (OPENBABEL2_INCLUDE_DIR AND OPENBABEL2_LIBRARIES AND OPENBABEL2_VERSION_MET)
<span class="preprocessor"> # in cache already</span>
<span class="preprocessor"></span> <span class="keyword">set</span>(OPENBABEL2_FOUND TRUE)
<span class="keywordflow">else</span> (OPENBABEL2_INCLUDE_DIR AND OPENBABEL2_LIBRARIES AND OPENBABEL2_VERSION_MET)
<span class="keywordflow">if</span>(NOT WIN32)
<span class="preprocessor"> # Use the newer PkgConfig stuff</span>
<span class="preprocessor"></span> find_package(PkgConfig REQUIRED)
pkg_check_modules(OPENBABEL2 openbabel-2.0>=2.2.0)
<span class="preprocessor"># Maintain backwards compatibility with previous version of module</span>
<span class="preprocessor"></span> <span class="keywordflow">if</span>(OPENBABEL2_FOUND STREQUAL <span class="stringliteral">"1"</span>)
<span class="keyword">set</span>(OPENBABEL2_VERSION_MET TRUE)
<span class="keyword">set</span>(OPENBABEL2_INCLUDE_DIR ${OPENBABEL2_INCLUDE_DIRS})
endif(OPENBABEL2_FOUND STREQUAL <span class="stringliteral">"1"</span>)
<span class="keywordflow">else</span>(NOT WIN32)
<span class="keyword">set</span>(OPENBABEL2_VERSION_MET TRUE)
endif(NOT WIN32)
<span class="keywordflow">if</span>(OPENBABEL2_VERSION_MET)
<span class="keywordflow">if</span>(WIN32)
<span class="keywordflow">if</span>(NOT OPENBABEL2_INCLUDE_DIR)
find_path(OPENBABEL2_INCLUDE_DIR openbabel-2.0/openbabel/obconversion.h
PATHS
${_obIncDir}
${GNUWIN32_DIR}/include
$ENV{OPENBABEL2_INCLUDE_DIR}
)
<span class="keywordflow">if</span>(OPENBABEL2_INCLUDE_DIR)
set(OPENBABEL2_INCLUDE_DIR ${OPENBABEL2_INCLUDE_DIR}/openbabel-2.0)
endif(OPENBABEL2_INCLUDE_DIR)
endif(NOT OPENBABEL2_INCLUDE_DIR)
endif(WIN32)
find_library(OPENBABEL2_LIBRARIES NAMES openbabel openbabel-2
PATHS
${_obLinkDir}
${GNUWIN32_DIR}/lib
$ENV{OPENBABEL2_LIBRARIES}
)
endif(OPENBABEL2_VERSION_MET)
if(OPENBABEL2_INCLUDE_DIR AND OPENBABEL2_LIBRARIES AND OPENBABEL2_VERSION_MET)
set(OPENBABEL2_FOUND TRUE)
endif(OPENBABEL2_INCLUDE_DIR AND OPENBABEL2_LIBRARIES AND OPENBABEL2_VERSION_MET)
if (OPENBABEL2_FOUND)
if (NOT OpenBabel2_FIND_QUIETLY)
message(STATUS "Found OpenBabel 2.2 or later: ${OPENBABEL2_LIBRARIES}<span class="stringliteral">")</span>
<span class="stringliteral"> endif (NOT OpenBabel2_FIND_QUIETLY)</span>
<span class="stringliteral"> else (OPENBABEL2_FOUND)</span>
<span class="stringliteral"> if (OpenBabel2_FIND_REQUIRED)</span>
<span class="stringliteral"> message(FATAL_ERROR "</span>Could NOT find OpenBabel 2.2 or later <span class="stringliteral">")</span>
<span class="stringliteral"> endif (OpenBabel2_FIND_REQUIRED)</span>
<span class="stringliteral"> endif (OPENBABEL2_FOUND)</span>
<span class="stringliteral"></span>
<span class="stringliteral"> mark_as_advanced(OPENBABEL2_INCLUDE_DIR OPENBABEL2_LIBRARIES)</span>
<span class="stringliteral"></span>
<span class="stringliteral">endif (OPENBABEL2_INCLUDE_DIR AND OPENBABEL2_LIBRARIES AND OPENBABEL2_VERSION_MET)</span>
<span class="stringliteral"></span>
<span class="stringliteral"># Search for Open Babel2 executable</span>
<span class="stringliteral">if(OPENBABEL2_EXECUTABLE)</span>
<span class="stringliteral"></span>
<span class="stringliteral"> # in cache already</span>
<span class="stringliteral"> set(OPENBABEL2_EXECUTABLE_FOUND TRUE)</span>
<span class="stringliteral"></span>
<span class="stringliteral">else(OPENBABEL2_EXECUTABLE)</span>
<span class="stringliteral"> find_program(OPENBABEL2_EXECUTABLE NAMES babel</span>
<span class="stringliteral"> PATHS</span>
<span class="stringliteral"> [HKEY_CURRENT_USER\\SOFTWARE\\OpenBabel\ 2.2.0]</span>
<span class="stringliteral"> $ENV{OPENBABEL2_EXECUTABLE}</span>
<span class="stringliteral"> )</span>
<span class="stringliteral"></span>
<span class="stringliteral"> if(OPENBABEL2_EXECUTABLE)</span>
<span class="stringliteral"> set(OPENBABEL2_EXECUTABLE_FOUND TRUE)</span>
<span class="stringliteral"> endif(OPENBABEL2_EXECUTABLE)</span>
<span class="stringliteral"></span>
<span class="stringliteral"> if(OPENBABEL2_EXECUTABLE_FOUND)</span>
<span class="stringliteral"> message(STATUS "</span>Found OpenBabel2 executable: ${OPENBABEL2_EXECUTABLE}<span class="stringliteral">")</span>
<span class="stringliteral"> endif(OPENBABEL2_EXECUTABLE_FOUND)</span>
<span class="stringliteral"></span>
<span class="stringliteral">endif(OPENBABEL2_EXECUTABLE)</span>
</pre></div> </div></div>
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