modules/cmake: Fix setting install_dir

Fixes: #7301

mesonbuild/modules/cmake.py

@@ -252,8 +252,7 @@ class CmakeModule(ExtensionModule):
         (ofile_path, ofile_fname) = os.path.split(os.path.join(state.subdir, '{}Config.cmake'.format(name)))
         ofile_abs = os.path.join(state.environment.build_dir, ofile_path, ofile_fname)
 
-        if 'install_dir' not in kwargs:
+        install_dir = kwargs.get('install_dir', os.path.join(state.environment.coredata.get_builtin_option('libdir'), 'cmake', name))
-            install_dir = os.path.join(state.environment.coredata.get_builtin_option('libdir'), 'cmake', name)
         if not isinstance(install_dir, str):
             raise mesonlib.MesonException('"install_dir" must be a string.')
 

test cases/cmake/19 cmake file/foolib.cmake.in

@@ -0,0 +1 @@
+@foo@

test cases/cmake/19 cmake file/meson.build

@@ -0,0 +1,14 @@
+project(
+  'cmake config file',
+)
+
+cmake = import('cmake')
+
+cmake_conf = configuration_data()
+cmake_conf.set_quoted('foo', 'bar')
+cmake.configure_package_config_file(
+  name : 'foolib',
+  input : 'foolib.cmake.in',
+  install_dir : get_option('libdir') / 'cmake',
+  configuration : cmake_conf,
+)

test cases/cmake/19 cmake file/test.json

@@ -0,0 +1,5 @@
+{
+  "installed": [
+    {"file": "usr/lib/cmake/foolibConfig.cmake", "type": "file"}
+  ]
+}