meson: support building .standalone variants for shared modules

Extend the module building logic to automatically generate '.standalone'
variants for non-NSS/PAM shared modules (such as cryptsetup tokens).

Like standalone executables, these are not built by default to keep
the base build time unaffected, but can be built explicitly on demand
via `ninja <module_name>.standalone`.

meson.build

@@ -2525,6 +2525,7 @@ test_dlopen = executables_by_name.get('test-dlopen')
 nss_targets = []
 pam_targets = []
 module_targets = []
+modules_by_name = {}
 foreach dict : modules
         name = dict.get('name')
         is_nss = name.startswith('nss_')
@@ -2570,6 +2571,40 @@ foreach dict : modules
         )
 
         module_targets += lib
+        modules_by_name += { name : lib }
+
+        if not is_nss and not is_pam
+                # Typically for cryptsetup token modules.
+
+                name_static = name + '.standalone'
+                kwargs_static = kwargs
+
+                link_with_static = []
+                foreach obj : kwargs_static.get('link_with', [])
+                        if obj.full_path() == libshared.full_path()
+                                link_with_static += [
+                                        libshared_static,
+                                        libsystemd_static,
+                                ]
+                        else
+                                link_with_static += obj
+                        endif
+                endforeach
+
+                kwargs_static += {
+                        'link_with' : link_with_static,
+                        'install' : false,
+                        'build_by_default' : false,
+                }
+
+                lib_static = shared_library(
+                        name_static,
+                        kwargs : kwargs_static,
+                        implicit_include_directories : false,
+                )
+
+                modules_by_name += { name_static : lib_static }
+        endif
 
         if is_nss
                 # We cannot use shared_module because it does not support version suffix.

src/cryptsetup/cryptsetup-tokens/meson.build

@@ -9,7 +9,6 @@ lib_cryptsetup_token_common = static_library(
                 libcryptsetup_cflags,
                 userspace,
         ],
-        link_with : libshared,
         build_by_default : false)
 
 cryptsetup_token_systemd_tpm2_sources = files(