boot: Build BCD parser only on arches supported by Windows

src/boot/efi/boot.c

@@ -1941,6 +1941,7 @@ static void config_entry_add_osx(Config *config) {
 }
 
 static void config_entry_add_windows(Config *config, EFI_HANDLE *device, EFI_FILE *root_dir) {
+#if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
         _cleanup_freepool_ CHAR8 *bcd = NULL;
         CHAR16 *title = NULL;
         EFI_STATUS err;
@@ -1961,6 +1962,7 @@ static void config_entry_add_windows(Config *config, EFI_HANDLE *device, EFI_FIL
         config_entry_add_loader_auto(config, device, root_dir, NULL,
                                      L"auto-windows", 'w', title ?: L"Windows Boot Manager",
                                      L"\\EFI\\Microsoft\\Boot\\bootmgfw.efi");
+#endif
 }
 
 static void config_entry_add_linux(

src/boot/efi/meson.build

@@ -331,7 +331,6 @@ common_sources = [
         'util.c']
 
 systemd_boot_sources = [
-        'bcd.c',
         'boot.c',
         'console.c',
         'drivers.c',
@@ -351,6 +350,18 @@ else
         stub_sources += 'linux.c'
 endif
 
+# BCD parser only makes sense on arches that Windows supports.
+if efi_arch[1] in ['ia32', 'x86_64', 'arm', 'aarch64']
+        systemd_boot_sources += 'bcd.c'
+        tests += [
+                [['src/boot/efi/test-bcd.c'],
+                 [],
+                 [libzstd],
+                 [],
+                 'HAVE_ZSTD'],
+        ]
+endif
+
 systemd_boot_objects = []
 stub_objects = []
 foreach file : fundamental_source_paths + common_sources + systemd_boot_sources + stub_sources
@@ -407,14 +418,6 @@ endforeach
 
 ############################################################
 
-tests += [
-        [['src/boot/efi/test-bcd.c'],
-         [],
-         [libzstd],
-         [],
-         'HAVE_ZSTD'],
-]
-
 test_efi_disk_img = custom_target(
         'test-efi-disk.img',
         input : [efi_stubs[0][0], efi_stubs[1][1]],