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David Sterba authored
Copied from linux kernel, 'make W=1' will build with various additional warnings turned on. There are 3 levels, combinations are possible. The build is quite noisy, not all warnings need to be fixed. A specific warning can be turned on by 'make EXTRA_CFLAGS=-Wsomething'. Signed-off-by: David Sterba <dsterba@suse.com>
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