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107 lines
4.2 KiB
Markdown
107 lines
4.2 KiB
Markdown
Build Instructions for NetCDF-C using CMake {#netCDF-CMake}
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===========================================
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[TOC]
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# Overview {#cmake_overview}
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Starting with netCDF-C 4.3.0, we are happy to announce the inclusion of CMake support. CMake will allow for building netCDF on a wider range of platforms, include Microsoft Windows with Visual Studio. CMake support also provides robust unit and regression testing tools. We will also maintain the standard autotools-based build system in parallel.
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In addition to providing new build options for netCDF-C, we will also provide pre-built binary downloads for the shared versions of netCDF for use with Visual Studio.
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# Requirements {#cmake_requirements}
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The following packages are required to build netCDF-C using CMake.
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* netCDF-C Source Code
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* CMake version 2.8.12 or greater.
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* Optional Requirements:
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* HDF5 Libraries for netCDF4/HDF5 support.
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* libcurl for DAP support.
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<center>
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<img src="deptree.jpg" height="250px" />
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</center>
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# The CMake Build Process {#cmake_build}
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There are four steps in the Build Process when using CMake
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1. Configuration: Before compiling, the software is configured based on the desired options.
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2. Building: Once configuration is complete, the libraries are compiled.
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3. Testing: Post-build, it is possible to run tests to ensure the functionality of the netCDF-C libraries.
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4. Installation: If all tests pass, the libraries can be installed in the location specified during configuration.
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For users who prefer pre-built binaries, installation packages are available at \ref winbin
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## Configuration {#cmake_configuration}
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The output of the configuration step is a project file based on the appropriate configurator specified. Common configurators include:
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* Unix Makefiles
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* Visual Studio
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* CodeBlocks
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* ... and others
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### Common CMake Options {#cmake_common_options}
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| **Option** | **Autotools** | **CMake** |
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| :------- | :---- | :----- |
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Specify Install Location | --prefix=PREFIX | -D"CMAKE\_INSTALL\_PREFIX=PREFIX"
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Enable/Disable netCDF-4 | --enable-netcdf-4<br>--disable-netcdf-4 | -D"ENABLE\_NETCDF\_4=ON" <br> -D"ENABLE\_NETCDF\_4=OFF"
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Enable/Disable DAP | --enable-dap <br> --disable-dap | -D"ENABLE\_DAP=ON" <br> -D"ENABLE\_DAP=OFF"
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Enable/Disable Utilities | --enable-utilities <br> --disable-utilities | -D"BUILD\_UTILITIES=ON" <br> -D"BUILD\_UTILITIES=OFF"
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Specify shared/Static Libraries | --enable-shared <br> --enable-static | -D"BUILD\_SHARED\_LIBS=ON" <br> -D"BUILD\_SHARED\_LIBS=OFF"
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Enable/Disable Tests | --enable-testsets <br> --disable-testsets | -D"ENABLE\_TESTS=ON" <br> -D"ENABLE\_TESTS=OFF"
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Specify a custom library location | Use *CFLAGS* and *LDFLAGS* | -D"CMAKE\_PREFIX\_PATH=/usr/custom_libs/"
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A full list of *basic* options can be found by invoking `cmake [Source Directory] -L`. To enable a list of *basic* and *advanced* options, one would invoke `cmake [Source Directory] -LA`.
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### Configuring your build from the command line. {#cmake_command_line}
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The easiest configuration case would be one in which all of the dependent libraries are installed on the system path (in either Unix/Linux or Windows) and all the default options are desired. From the build directory (often, but not required to be located within the source directory):
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> $ cmake [Source Directory]
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If you have libraries installed in a custom directory, you may need to specify the **CMAKE\_PREFIX_PATH** variable to tell cmake where the libraries are installed. For example:
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> $ cmake [Source Directory] -DCMAKE\_PREFIX\_PATH=/usr/custom_libraries/
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## Building {#cmake_building}
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The compiler can be executed directly with 'make' or the appropriate command for the configurator which was used.
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> $ make
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Building can also be executed indirectly via cmake:
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> $ cmake --build [Build Directory]
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## Testing {#cmake_testing}
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Testing can be executed several different ways:
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> $ make test
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or
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> $ ctest
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or
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> $ cmake --build [Build Directory] --target test
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## Installation {#cmake_installation}
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Once netCDF has been built and tested, it may be installed using the following commands:
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> $ make install
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or
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> $ cmake --build [Build Directory] --target install
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# See Also {#cmake_see_also}
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For further information regarding NetCDF and CMake, see \ref cmake_faq
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