Support multiple install dirs for built/custom targets

You can now pass a list of strings to the install_dir: kwarg to
build_target and custom_target.

Custom Targets:
===============
Allows you to specify the installation directory for each
corresponding output. For example:

    custom_target('different-install-dirs',
      output : ['first.file', 'second.file'],
      ...
      install : true,
      install_dir : ['somedir', 'otherdir])

This would install first.file to somedir and second.file to otherdir.

If only one install_dir is provided, all outputs are installed there
(same behaviour as before).

To only install some outputs, pass `false` for the outputs that you
don't want installed. For example:

    custom_target('only-install-second',
      output : ['first.file', 'second.file'],
      ...
      install : true,
      install_dir : [false, 'otherdir])

This would install second.file to otherdir and not install first.file.

Build Targets:
==============
With build_target() (which includes executable(), library(), etc),
usually there is only one primary output. However some types of
targets have multiple outputs.

For example, while generating Vala libraries, valac also generates
a header and a .vapi file both of which often need to be installed.
This allows you to specify installation directories for those too.

    # This will only install the library (same as before)
    shared_library('somevalalib', 'somesource.vala',
      ...
      install : true)

    # This will install the library, the header, and the vapi into the
    # respective directories
    shared_library('somevalalib', 'somesource.vala',
      ...
      install : true,
      install_dir : ['libdir', 'incdir', 'vapidir'])

    # This will install the library into the default libdir and
    # everything else into the specified directories
    shared_library('somevalalib', 'somesource.vala',
      ...
      install : true,
      install_dir : [true, 'incdir', 'vapidir'])

    # This will NOT install the library, and will install everything
    # else into the specified directories
    shared_library('somevalalib', 'somesource.vala',
      ...
      install : true,
      install_dir : [false, 'incdir', 'vapidir'])

true/false can also be used for secondary outputs in the same way.

Valac can also generate a GIR file for libraries when the `vala_gir:`
keyword argument is passed to library(). In that case, `install_dir:`
must be given a list with four elements, one for each output.

Includes tests for all these.

Closes https://github.com/mesonbuild/meson/issues/705
Closes https://github.com/mesonbuild/meson/issues/891
Closes https://github.com/mesonbuild/meson/issues/892
Closes https://github.com/mesonbuild/meson/issues/1178
Closes https://github.com/mesonbuild/meson/issues/1193

2 files changed, 40 insertions, 0 deletions

diff --git a/test cases/vala/7 shared library/installed_files.txt b/test cases/vala/7 shared library/installed_files.txt
new file mode 100644
index 0000000..16ea442
--- /dev/null
+++ b/test cases/vala/7 shared library/installed_files.txt
@@ -0,0 +1,8 @@
+usr/lib/libinstalled_vala_lib.so
+usr/lib/libinstalled_vala_all.so
+usr/include/installed_vala_all.h
+usr/include/installed_vala_all_nolib.h
+usr/include/installed_vala_onlyh.h
+usr/share/vala/vapi/installed_vala_all.vapi
+usr/share/vala/vapi/installed_vala_all_nolib.vapi
+usr/share/vala/vapi/installed_vala_onlyvapi.vapi
diff --git a/test cases/vala/7 shared library/lib/meson.build b/test cases/vala/7 shared library/lib/meson.build
index 8eca0d4..bb1e800 100644
--- a/test cases/vala/7 shared library/lib/meson.build
+++ b/test cases/vala/7 shared library/lib/meson.build
@@ -1 +1,33 @@
 l = shared_library('valalib', 'mylib.vala', dependencies : valadeps)
+
+shared_library('installed_vala_lib', 'mylib.vala',
+  dependencies : valadeps,
+  install : true)
+
+shared_library('installed_vala_all', 'mylib.vala',
+  dependencies : valadeps,
+  install : true,
+  install_dir : [true,
+                 join_paths(get_option('prefix'), get_option('includedir')),
+                 join_paths(get_option('prefix'), get_option('datadir'), 'vala', 'vapi')])
+
+shared_library('installed_vala_all_nolib', 'mylib.vala',
+  dependencies : valadeps,
+  install : true,
+  install_dir : [false,
+                 join_paths(get_option('prefix'), get_option('includedir')),
+                 join_paths(get_option('prefix'), get_option('datadir'), 'vala', 'vapi')])
+
+shared_library('installed_vala_onlyh', 'mylib.vala',
+  dependencies : valadeps,
+  install : true,
+  install_dir : [false,
+                 join_paths(get_option('prefix'), get_option('includedir')),
+                 false])
+
+shared_library('installed_vala_onlyvapi', 'mylib.vala',
+  dependencies : valadeps,
+  install : true,
+  install_dir : [false,
+                 false,
+                 join_paths(get_option('prefix'), get_option('datadir'), 'vala', 'vapi')])