[U-Boot] [PATCH 3/3 v2] Replace CONFIG_SYS_GBL_DATA_SIZE by auto-generated value
Alessandro Rubini
rubini-list at gnudd.com
Tue Oct 26 23:18:21 CEST 2010
> Is it guaranteed (I mean by the C standard) that the alignment of a
> struct (which affects only the possible start address) also has effect
> on the sizeof() for that struct, in the sense that sizeof() is
> guaranteed to be a multiple of that alignment requirement?
Yes. Because if you make an array, all of them must be aligned, and
the size of an array is a multiple of sizeof(array_item). While
alignment is not in the standard, the sizeof/array relationship is.
It's in C99 draft (http://busybox.net/~landley/c99-draft.html)
6.5.3.4 The sizeof operator
#6
EXAMPLE 2 Another use of the sizeof operator is to compute the
number of elements in an array:
sizeof array / sizeof array[0]
/alessandro
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