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115 lines
3.2 KiB
Markdown
115 lines
3.2 KiB
Markdown
## For users - how to compile FluidSynth
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The latest information on how to compile FluidSynth using the cmake build system can be found in our wiki:
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https://github.com/FluidSynth/fluidsynth/wiki/BuildingWithCMake
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## For developers - how to add a new feature to the CMake build system
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Let's explain this issue with an example. We are adding D-Bus support to
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FluidSynth as an optional feature, conditionally adding source files that
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require this feature. The first step is to add a macro "option()" to the main
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CMakeLists.txt file, the one that is located at the fluidsynth root directory.
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file CMakeLists.txt, line 64:
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```cmake
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option ( enable-dbus "compile DBUS support (if it is available)" on )
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```
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Now, let's check if the dbus-1 library and headers are installed, using
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pkg-config:
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file CMakeLists.txt, lines 371-377:
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```cmake
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unset ( DBUS_SUPPORT CACHE )
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if ( enable-dbus )
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pkg_check_modules ( DBUS dbus-1>=1.0.0 )
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set ( DBUS_SUPPORT ${DBUS_FOUND} )
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else ( enable-dbus )
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unset_pkg_config ( DBUS )
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endif ( enable-dbus )
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```
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The first line clears the value of the CMake variable DBUS_SUPPORT. If the
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value of the option "enable-dbus" is true, then the macro pkg_check_modules()
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is used to test a package named "dbus-1" with version 1.0.0 or later. This macro
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automatically defines the variables DBUS_LIBRARIES, DBUS_INCLUDEDIR, DBUS_FOUND
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and others. The value of the last one is assigned to our variable DBUS_SUPPORT
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for later use.
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There is a report to summarize the performed checks and the enabled features
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after the configuration steps, so let's add a line in this report regarding
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the D-Bus support.
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file cmake_admin/report.cmake, lines 14-18:
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```cmake
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if ( DBUS_SUPPORT )
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message ( "D-Bus: yes" )
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else ( DBUS_SUPPORT )
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message ( "D-Bus: no" )
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endif ( DBUS_SUPPORT )
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```
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The variable DBUS_SUPPORT is available for the CMake files, but we want to make
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it available to the compilers as well, to conditionally build code using
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"#ifdef DBUS_SUPPORT". This can be done adding a line to the config.cmake file:
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file src/config.cmake, lines 22-23:
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```c
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/* Define if D-Bus support is enabled */
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#cmakedefine DBUS_SUPPORT @DBUS_SUPPORT@
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```
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The file config.cmake will be processed at configure time, producing a header
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file "config.h" in the build directory with this content, if the dbus support
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has been enabled and found:
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```c
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/* Define if D-Bus support is enabled */
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#define DBUS_SUPPORT 1
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```
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Finally, we can add the new source files to the build system for the compiler
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target with the macro add_library(), and the libraries for the linker target
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with the macros link_directories() and target_link_libraries().
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file src/CMakeLists.txt, lines 57-60
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```cmake
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if ( DBUS_SUPPORT )
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set ( fluid_dbus_SOURCES fluid_rtkit.c fluid_rtkit.h )
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include_directories ( ${DBUS_INCLUDEDIR} ${DBUS_INCLUDE_DIRS} )
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endif ( DBUS_SUPPORT )
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```
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file src/CMakeLists.txt, lines 163-197
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```cmake
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link_directories (
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...
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${DBUS_LIBDIR}
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${DBUS_LIBRARY_DIRS}
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)
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add_library ( libfluidsynth
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...
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${fluid_dbus_SOURCES}
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...
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)
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```
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file src/CMakeLists.txt, lines 163-197
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```cmake
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target_link_libraries ( libfluidsynth
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...
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${DBUS_LIBRARIES}
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...
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)
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```
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