lib/reed_solomon: Fix array subscript 0 is outside array bounds

The grub_absolute_pointer() is a compound expression that can only work
within a function. We are out of luck here when the pointer variables
require global definition due to ATTRIBUTE_TEXT that have to use fully
initialized global definition because of the way linkers work.

  static gf_single_t * const gf_powx ATTRIBUTE_TEXT = (void *) 0x100000;

For the reason given above, use GCC diagnostic pragmas to suppress the
array-bounds warning.

Signed-off-by: Michael Chang <mchang@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

diff --git a/grub-core/lib/reed_solomon.c b/grub-core/lib/reed_solomon.c
index 82779a296b98c95b867accd1b13e810fc46c606f..562bd2e3e3f958672171903eb2b6263b5037deac 100644 (file)
--- a/grub-core/lib/reed_solomon.c
+++ b/grub-core/lib/reed_solomon.c
@@ -102,6 +102,11 @@ static gf_single_t errvals[256];
 static gf_single_t eqstat[65536 + 256];
 #endif
 
+#if __GNUC__ == 12
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Warray-bounds"
+#endif
+
 static gf_single_t
 gf_mul (gf_single_t a, gf_single_t b)
 {
@@ -319,6 +324,10 @@ decode_block (gf_single_t *ptr, grub_size_t s,
     }
 }
 
+#if __GNUC__ == 12
+#pragma GCC diagnostic pop
+#endif
+
 #if !defined (STANDALONE)
 static void
 encode_block (gf_single_t *ptr, grub_size_t s,