efi_loader: avoid initializer element is not constant

When building with -pedantic the current definition of EFI_GUID() causes
an error 'initializer element is not constant'.

Currently EFI_GUID() is used both as an anonymous constant and as an
intializer. A conversion to efi_guid_t is not allowable when using
EFI_GUID() as an initializer. But it is needed when using it as an
anonymous constant.

We should not use EFI_GUID() for anything but an initializer. So let's
introduce a variable where needed and remove the conversion.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

disk/part_efi.c

@@ -23,6 +23,11 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+/*
+ * GUID for basic data partions.
+ */
+static const efi_guid_t partition_basic_data_guid = PARTITION_BASIC_DATA_GUID;
+
 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 /**
  * efi_crc32() - EFI version of crc32 function
@@ -502,12 +507,12 @@ int gpt_fill_pte(struct blk_desc *dev_desc,
 		} else {
 			/* default partition type GUID */
 			memcpy(bin_type_guid,
-			       &PARTITION_BASIC_DATA_GUID, 16);
+			       &partition_basic_data_guid, 16);
 		}
 #else
 		/* partition type GUID */
 		memcpy(gpt_e[i].partition_type_guid.b,
-			&PARTITION_BASIC_DATA_GUID, 16);
+			&partition_basic_data_guid, 16);
 #endif
 
 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)

include/efi.h

@@ -89,12 +89,11 @@ typedef u64 efi_virtual_addr_t;
 typedef void *efi_handle_t;
 
 #define EFI_GUID(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
-	((efi_guid_t) \
 	{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, \
 		((a) >> 24) & 0xff, \
 		(b) & 0xff, ((b) >> 8) & 0xff, \
 		(c) & 0xff, ((c) >> 8) & 0xff, \
-		(d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) } })
+		(d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) } }
 
 /* Generic EFI table header */
 struct efi_table_hdr {