Compiling D applications
Meson has support for compiling D programs. A minimal
file for D looks like this:
project('myapp', 'd') executable('myapp', 'app.d')
If you are using the version() feature for conditional compilation,
you can use it using the
d_module_versions target property:
project('myapp', 'd') executable('myapp', 'app.d', d_module_versions: ['Demo', 'FeatureA'])
For debugging, debug() conditions are compiled automatically in debug builds, and extra identifiers can be added with the
project('myapp', 'd') executable('myapp', 'app.d', d_debug: [3, 'DebugFeatureA'])
Using embedded unittests
If you are using embedded unittest functions, your source code needs
to be compiled twice, once in regular
mode, and once with unittests active. This is done by setting the
d_unittest target property to
Meson will only ever pass the respective compiler's
and never have the compiler generate an empty main function.
If you need that feature in a portable way, create an empty
function for unittests yourself, since the GNU D compiler
does not have this feature.
This is an example for using D unittests with Meson:
project('myapp_tested', 'd') myapp_src = ['app.d', 'alpha.d', 'beta.d'] executable('myapp', myapp_src) test_exe = executable('myapp_test', myapp_src, d_unittest: true) test('myapptest', test_exe)
Compiling D libraries and installing them
Building D libraries is a straightforward process, not different from how C libraries are built in Meson. You should generate a pkg-config file and install it, in order to make other software on the system find the dependency once it is installed.
This is an example on how to build a D shared library:
project('mylib', 'd', version: '1.2.0') project_soversion = 0 glib_dep = dependency('glib-2.0') my_lib = library('mylib', ['src/mylib/libfunctions.d'], dependencies: [glib_dep], install: true, version: meson.project_version(), soversion: project_soversion, d_module_versions: ['FeatureA', 'featureB'] ) pkgc = import('pkgconfig') pkgc.generate(name: 'mylib', libraries: my_lib, subdirs: 'd/mylib', version: meson.project_version(), description: 'A simple example D library.', d_module_versions: ['FeatureA'] ) install_subdir('src/mylib/', install_dir: 'include/d/mylib/')
It is important to make the D sources install in a subdirectory in the
include path, in this case
All D compilers include the
/usr/include/d directory by default, and
if your library would be installed into
is a high chance that, when you compile your project again on a
machine where you installed it, the compiler will prefer the old
installed include over the new version in the source tree, leading to
very confusing errors.
This is an example of how to use the D library we just built and installed in an application:
project('myapp', 'd') mylib_dep = dependency('mylib', version: '>= 1.2.0') myapp_src = ['app.d', 'alpha.d', 'beta.d'] executable('myapp', myapp_src, dependencies: [mylib_dep])
Please keep in mind that the library and executable would both need to be built with the exact same D compiler and D compiler version. The D ABI is not stable across compilers and their versions, and mixing compilers will lead to problems.
Integrating with DUB
DUB is a fully integrated build system for D, but it is also a way to
provide dependencies. Adding dependencies from the D package registry
is pretty straight forward. You can find how to do this in
Dependencies. You can also automatically
dub.json file as explained in Dlang.
The results of the search are