83 lines
3.0 KiB
HTML
83 lines
3.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<!--#include virtual="/CMake/HTML/Head.html"-->
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<body bgcolor="#FFFFFF" leftmargin=0 topmargin=0 text="black" link="#FFFFFF"
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vlink="#000000" alink="#000000">
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<!--#include virtual="/CMake/HTML/Table.html"-->
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<tr>
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<!--#include virtual="/CMake/HTML/SideBar.html"-->
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<td width="550" valign="top" bgcolor="#FFFFFF">
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<div align="left">
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<font size=5>The following example </font> demonstrates some key ideas
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of CMake. (You may wish to download this
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<a href="/CMake/HTML/cmakeExample.tar.gz">example code</a> and try it
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out for yourself.) Make sure that you have CMake installed prior to
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running this example (go <a href="/CMake/HTML/Install.html">here</a>
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for instructions).
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<p>
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There are three directories involved. The top level directory has two
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subdirectories called ./Demo and ./Hello. In the directory ./Hello, a
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library is built. In the directory ./Demo, an executable is built by
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linking to the library. A total of three CMakeList.txt files are
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created: one for each directory.
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<p>
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The first, top-level directory contains the following CMakeLists.txt file.
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<pre>
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# The name of our project is "HELLO". CMakeLists files in this project can
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# refer to the root source directory of the project as ${HELLO_SOURCE_DIR} and
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# to the root binary directory of the project as ${HELLO_BINARY_DIR}.
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PROJECT(HELLO)
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# Recurse into the "Hello" and "Demo" subdirectories. This does not actually
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# cause another cmake executable to run. The same process will walk through
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# the project's entire directory structure.
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SUBDIRS(Hello Demo)
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</pre>
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Then for each subdirectory listed in the SUBDIRS command, CMakeLists.txt
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files are created. In the ./Hello directory, the following CMakeLists.txt
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file is created:
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<pre>
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# Create a library called "Hello" which includes the source file "hello.cxx".
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# The extension is already found. Any number of sources could be listed here.
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ADD_LIBRARY(Hello hello)
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</pre>
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Finally, in the ./Demo directory, the third and final CMakeLists.txt file
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is created:
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<pre>
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# Make sure the compiler can find include files from our Hello library.
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INCLUDE_DIRECTORIES(${HELLO_SOURCE_DIR}/Hello)
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# Make sure the linker can find the Hello library once it is built.
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LINK_DIRECTORIES(${HELLO_BINARY_DIR}/Hello)
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# Add executable called "helloDemo" that is built from the source files
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# "demo.cxx" and "demo_b.cxx". The extensions are automatically found.
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ADD_EXECUTABLE(helloDemo demo demo_b)
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# Link the executable to the Hello library.
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TARGET_LINK_LIBRARIES(helloDemo Hello)
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</pre>
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CMake when executed in the top-level directory will process the
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CMakeLists.txt file and then descend into the listed subdirectories.
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Variables, include paths, library paths, etc. are inherited. Depending
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on the system, makefiles (Unix) or workspaces/projects (MSVC) will be
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built. These can then be used in the usual way to build the code.
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</div>
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</td>
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</tr>
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</table>
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</td>
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</tr>
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</table>
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</body>
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</html>
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