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79 lines
2.2 KiB
79 lines
2.2 KiB
8 years ago
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---
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title: Vala
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...
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# Compiling Vala applications
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Meson has support for compiling Vala programs. A skeleton Vala file looks like this.
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```meson
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project('valaprog', ['vala', 'c'])
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glib = dependency('glib-2.0')
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gobject = dependency('gobject-2.0')
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executable('valaprog', 'prog.vala',
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dependencies : [glib, gobject])
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```
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You must always specify `glib` and `gobject` as dependencies, because all Vala applications use them.
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## Using a custom VAPI
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When dealing with libraries that are not providing Vala bindings, you can point --vapidir to a directory relative to meson.current_source_dir containing the binding and include a --pkg flag.
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```meson
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glib = dependency('glib-2.0')
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gobject = dependency('gobject-2.0')
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foo = dependency('foo')
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executable('app',
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dependencies: [glib, gobject, foo]
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vala_args: ['--pkg=foo', '--vapidir=' + meson.current_source_dir()])
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```
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## GObject Introspection
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To generate GObject Introspection metadata, the --gir flags has to be set explicitly in vala_args.
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```meson
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foo_lib = library('foo',
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dependencies: [glib, gobject],
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vala_args: ['--gir=Foo-1.0.gir'])
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```
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For the typelib, use a custom_target depending on the library:
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```meson
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g_ir_compiler = find_program('g_ir_compiler')
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custom_target('foo-typelib',
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command: [g_ir_compiler, '--output', '@OUTPUT@', meson.current_build_dir() + '/foo@sha/Foo-1.0.gir'],
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output: 'Foo-1.0.typelib',
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depends: foo_lib,
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install: true,
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install_dir: get_option('libdir') + '/girepository-1.0')
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```
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## Installing VAPI and GIR files
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To install generated VAPI and GIR files, it is necessary to add a custom install script.
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```meson
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meson.add_install_script('install.sh')
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```
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```bash
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#!/bin/sh
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mkdir -p "${DESTDIR}${MESON_INSTALL_PREFIX}/share/vala/vapi"
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mkdir -p "${DESTDIR}${MESON_INSTALL_PREFIX}/share/gir-1.0"
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install -m 0644 \
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"${MESON_BUILD_ROOT}/foo-1.0.vapi" \
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$"{DESTDIR}${MESON_INSTALL_PREFIX}/share/vala/vapi"
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install -m 0644 \
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"${MESON_BUILD_ROOT}/foo@sha/Foo-1.0.gir" \
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"${DESTDIR}${MESON_INSTALL_PREFIX}/share/gir-1.0"
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```
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