------- Comment #42 from matz at suse dot de 2006-01-23 11:28 -------
Created an attachment (id=10711)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10711&action=view)
Testprogram
This program generates the following output for 3.3-hammer-branch on x86-64:
S_normal_i size 8 align 4 ofs 4
S_pragma_i size 8 align 1 ofs 4
S_packed_i size 12 align 1 ofs 8
S_pragma_packed_i size 12 align 1 ofs 8
S_normal_ll size 16 align 8 ofs 8
S_pragma_ll size 16 align 1 ofs 8
S_packed_ll size 16 align 1 ofs 8
S_pragma_packed_ll size 16 align 1 ofs 8
With -m32 it's:
S_normal_i size 8 align 4 ofs 4
S_pragma_i size 8 align 1 ofs 4
S_packed_i size 8 align 1 ofs 4
S_pragma_packed_i size 8 align 1 ofs 4
S_normal_ll size 16 align 4 ofs 8
S_pragma_ll size 16 align 1 ofs 8
S_packed_ll size 12 align 1 ofs 4
S_pragma_packed_ll size 12 align 1 ofs 4
Note how 3.3 handled packed structs (in difference to those under #pragma)
really strange.
With 4.1 plus patch on x86-64:
S_normal_i size 8 align 4 ofs 4
S_pragma_i size 8 align 1 ofs 4
S_packed_i size 8 align 1 ofs 4
S_pragma_packed_i size 8 align 1 ofs 4
S_normal_ll size 16 align 8 ofs 8
S_pragma_ll size 16 align 1 ofs 8
S_packed_ll size 16 align 1 ofs 8
S_pragma_packed_ll size 16 align 1 ofs 8
With -m32:
S_normal_i size 8 align 4 ofs 4
S_pragma_i size 8 align 1 ofs 4
S_packed_i size 8 align 1 ofs 4
S_pragma_packed_i size 8 align 1 ofs 4
S_normal_ll size 12 align 4 ofs 4
S_pragma_ll size 12 align 1 ofs 4
S_packed_ll size 12 align 1 ofs 4
S_pragma_packed_ll size 12 align 1 ofs 4
So, it's at least consistent, and maybe even senseful
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22275
