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gcc 4.4 produces tons of
"dereferencing type-punned pointer will break strict-aliasing rules"
warnings for fdisk code where is
char buffer[BUFSIZ];
((struct disklabel *) MBRBuffer)->foo
There are two ways how fix the problem:
1/ union {
char buffer[BUFSIZ], struct disklabel label
} MBRBuffer;
2/ use allocated buffer, this way seems less invasive.
This patch implements 2/.
Old version:
$ make -C fdisk | grep -c warning
236
New version:
$ make -C fdisk | grep -c warning
0
About aliasing:
- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40665
- http://cellperformance.beyond3d.com/articles/2006/06/understanding-strict-aliasing.html
- C99
Signed-off-by: Karel Zak <kzak@redhat.com>
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