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---
title: Vala
...
# Compiling Vala applications
Meson has support for compiling Vala programs. A skeleton Vala file looks like this.
```meson
project('valaprog', ['vala', 'c'])
glib = dependency('glib-2.0')
gobject = dependency('gobject-2.0')
executable('valaprog', 'prog.vala',
dependencies : [glib, gobject])
```
You must always specify `glib` and `gobject` as dependencies, because all Vala applications use them.
## Using a custom VAPI
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.
```meson
glib = dependency('glib-2.0')
gobject = dependency('gobject-2.0')
foo = dependency('foo')
executable('app',
dependencies: [glib, gobject, foo]
vala_args: ['--pkg=foo', '--vapidir=' + meson.current_source_dir()])
```
## GObject Introspection
To generate GObject Introspection metadata, the --gir flags has to be set explicitly in vala_args.
```meson
foo_lib = library('foo',
dependencies: [glib, gobject],
vala_args: ['--gir=Foo-1.0.gir'])
```
For the typelib, use a custom_target depending on the library:
```meson
g_ir_compiler = find_program('g_ir_compiler')
custom_target('foo-typelib',
command: [g_ir_compiler, '--output', '@OUTPUT@', meson.current_build_dir() + '/foo@sha/Foo-1.0.gir'],
output: 'Foo-1.0.typelib',
depends: foo_lib,
install: true,
install_dir: get_option('libdir') + '/girepository-1.0')
```
## Installing VAPI and GIR files
To install generated VAPI and GIR files, it is necessary to add a custom install script.
```meson
meson.add_install_script('install.sh')
```
```bash
#!/bin/sh
mkdir -p "${DESTDIR}${MESON_INSTALL_PREFIX}/share/vala/vapi"
mkdir -p "${DESTDIR}${MESON_INSTALL_PREFIX}/share/gir-1.0"
install -m 0644 \
"${MESON_BUILD_ROOT}/foo-1.0.vapi" \
$"{DESTDIR}${MESON_INSTALL_PREFIX}/share/vala/vapi"
install -m 0644 \
"${MESON_BUILD_ROOT}/foo@sha/Foo-1.0.gir" \
"${DESTDIR}${MESON_INSTALL_PREFIX}/share/gir-1.0"
```
|
