vcs_tag: Add install kwargs

Fixes: #4893

docs/markdown/snippets/vcs_tag.md

@@ -0,0 +1,4 @@
+## Install vcs_tag() output
+
+[[vcs_tag]] now has `install`, `install_dir`, `install_tag` and `install_mode`
+keyword arguments to install the generated file.

docs/yaml/functions/vcs_tag.yaml

@@ -55,3 +55,34 @@ kwargs:
     type: str
     default: "'@VCS_TAG@'"
     description: String in the input file to substitute with the commit information.
+
+  install:
+    type: bool
+    default: false
+    since: 1.7.0
+    description: |
+      When true, this generated file is installed during
+      the install step, and `install_dir` must be set and not empty.
+
+  install_dir:
+    type: str
+    since: 1.7.0
+    description: |
+      The subdirectory to install the generated file to (e.g. `share/myproject`).
+
+  install_mode:
+    type: list[str | int]
+    since: 1.7.0
+    description: |
+      Specify the file mode in symbolic format
+      and optionally the owner/uid and group/gid for the installed files.
+
+      See the `install_mode` kwarg of [[install_data]] for more information.
+
+  install_tag:
+    type: str
+    since: 1.7.0
+    description: |
+      A string used by the `meson install --tags` command
+      to install only a subset of the files. By default the file has no install
+      tag which means it is not being installed when `--tags` argument is specified.

mesonbuild/interpreter/interpreter.py

@@ -1954,6 +1954,10 @@ class Interpreter(InterpreterBase, HoldableObject):
         ),
         KwargInfo('fallback', (str, NoneType)),
         KwargInfo('replace_string', str, default='@VCS_TAG@'),
+        INSTALL_KW.evolve(since='1.7.0'),
+        INSTALL_DIR_KW.evolve(since='1.7.0'),
+        INSTALL_TAG_KW.evolve(since='1.7.0'),
+        INSTALL_MODE_KW.evolve(since='1.7.0'),
     )
     def func_vcs_tag(self, node: mparser.BaseNode, args: T.List['TYPE_var'], kwargs: 'kwtypes.VcsTag') -> build.CustomTarget:
         if kwargs['fallback'] is None:
@@ -1994,6 +1998,13 @@ class Interpreter(InterpreterBase, HoldableObject):
              replace_string,
              regex_selector] + vcs_cmd
 
+        install = kwargs['install']
+        install_mode = self._warn_kwarg_install_mode_sticky(kwargs['install_mode'])
+        install_dir = [] if kwargs['install_dir'] is None else [kwargs['install_dir']]
+        install_tag = [] if kwargs['install_tag'] is None else [kwargs['install_tag']]
+        if install and not install_dir:
+            raise InvalidArguments('vcs_tag: "install_dir" keyword argument must be set when "install" is true.')
+
         tg = build.CustomTarget(
             kwargs['output'][0],
             self.subdir,
@@ -2004,6 +2015,10 @@ class Interpreter(InterpreterBase, HoldableObject):
             kwargs['output'],
             build_by_default=True,
             build_always_stale=True,
+            install=install,
+            install_dir=install_dir,
+            install_mode=install_mode,
+            install_tag=install_tag,
         )
         self.add_target(tg.name, tg)
         return tg

test cases/common/66 vcstag/meson.build

@@ -32,7 +32,9 @@ tagprog = executable('tagprog', 'tagprog.c', version_src)
 
 version_src_executable = vcs_tag(input : 'vcstag.c.in',
 output : 'vcstag-executable.c',
-command : [tagprog])
+command : [tagprog],
+install: true,
+install_dir: get_option('includedir'))
 
 executable('tagprog-custom', 'tagprog.c', version_src_custom)
 executable('tagprog-fallback', 'tagprog.c', version_src_fallback)

test cases/common/66 vcstag/test.json

@@ -0,0 +1,8 @@
+{
+  "installed": [
+    {
+      "type": "file",
+      "file": "usr/include/vcstag-executable.c"
+    }
+  ]
+}