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See http://gcc.gnu.org/ml/gcc/2003-08/msg00959.html
Compiling glibc-2.3.2 with a gcc-3.4 snapshot, I'm seeing
a whole bunch of warnings like this:
../string/bits/string2.h:80: warning: `packed' attribute ignored
../string/bits/string2.h:81: warning: `packed' attribute ignored
...
Looks like it was bad code that was silently ignored by previous compilers.
Ulrich fixed it as follows:
===================================================================
RCS file: /cvs/glibc/libc/string/bits/string2.h,v
retrieving revision 1.68
retrieving revision 1.69
diff -u -r1.68 -r1.69
--- libc/string/bits/string2.h 2002/05/25 06:10:18 1.68
+++ libc/string/bits/string2.h 2003/08/20 00:07:37 1.69
@@ -1,5 +1,5 @@
/* Machine-independant string function optimizations.
- Copyright (C) 1997,1998,1999,2000,2001,2002 Free Software Foundation, Inc.
+ Copyright (C) 1997-2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@@ -76,7 +76,7 @@
use unaligned memory accesses. */
# define __STRING2_COPY_TYPE(N) \
typedef struct { unsigned char __arr[N]; } \
- __STRING2_COPY_ARR##N __attribute__ ((packed))
+ __attribute__ ((__packed__)) __STRING2_COPY_ARR##N
__STRING2_COPY_TYPE (2);
__STRING2_COPY_TYPE (3);
__STRING2_COPY_TYPE (4);
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