[PATCH] xfsprogs: don't warn about packed members

[Dave Chinner <david@fromorbit.com>]

From: Dave Chinner <dchinner@redhat.com>

gcc 9.2.1 throws lots of new warnings during the build like this:

xfs_format.h:790:3: warning: taking address of packed member of ‘struct xfs_agfl’ may result in an unaligned pointer value [-Waddress-of-packed-member]
  790 |   &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
xfs_alloc.c:3149:13: note: in expansion of macro ‘XFS_BUF_TO_AGFL_BNO’
 3149 |  agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp);
      |             ^~~~~~~~~~~~~~~~~~~

We know this packed structure aligned correctly, so turn off this
warning to shut gcc up.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
 include/builddefs.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/builddefs.in b/include/builddefs.in
index 4700b52706a7..6fdc9ebb70c7 100644
--- a/include/builddefs.in
+++ b/include/builddefs.in
@@ -13,7 +13,7 @@ OPTIMIZER = @opt_build@
 MALLOCLIB = @malloc_lib@
 LOADERFLAGS = @LDFLAGS@
 LTLDFLAGS = @LDFLAGS@
-CFLAGS = @CFLAGS@ -D_FILE_OFFSET_BITS=64
+CFLAGS = @CFLAGS@ -D_FILE_OFFSET_BITS=64 -Wno-address-of-packed-member
 BUILD_CFLAGS = @BUILD_CFLAGS@ -D_FILE_OFFSET_BITS=64
 
 LIBRT = @librt@
-- 
2.24.0.rc0