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SubjectRe: Subtleties of __attribute__((packed))
From
Jan Blunk wrote:
> Maybe the arm backend is somehow broken. AFAIK (and I verfied it on S390 and
> i386) the alignment shouldn't change.

To see a difference with your example structs you need to compare these two:

struct wibble1 {
char c;
struct bar1 b1;
};

struct wibble2 {
char c;
struct bar2 b2;
};

struct wibble1 w1 = { 1, { 2, {3,4,5} } };
struct wibble2 w2 = { 1, { 2, {3,4,5} } };

Can you try that with your compilers? I get:

w1:
.byte 1
.space 3 <<<----
.byte 2
.4byte 3
.byte 4
.space 3
.4byte 5
.space 3
.global w2
.align 2
.type w2, %object
.size w2, 16
w2:
.byte 1
.byte 2
.4byte 3
.byte 4
.space 3
.4byte 5
.space 2


Phil.




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