[Bug c++/34747] __attribute__((aligned(x)))+__alignof != correct behaviour
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=34747 Martin Sebor changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED CC||msebor at gcc dot gnu.org Blocks||58601 Resolution|--- |DUPLICATE --- Comment #5 from Martin Sebor --- When compiled with the current trunk (7.0), the test produces the output below (same as in comment #4). After reviewing the tests I believe all the failures are false positives. The failing tests assume that a #pragma pack directive doesn't affect the alignment of struct members. However, according to GCC documentation for attribute packed: "Specifying this attribute [packed] for struct and union types is equivalent to specifying the packed attribute on each of the structure or union members." And specifying the attribute on a member reduces its alignment to the one specified. So test5, for instance, expects the alignment of a struct defined just following #pragma pack not to be affected by the #pragma. Similarly for all the other failing tests. Since the valid tests pass (fixed by PR 10179) I'll go ahead and close this report as a duplicate of that bug. (Based on the summary of this I'm assuming the expectation is that #pragma pack have the same effect as attribute packed and not something else.) FAILED: test5 FAILED: test7 FAILED: test20 FAILED: test21 FAILED: test25 FAILED: test26 FAILED: test37 FAILED: test46 FAILED: test47 FAILED: test48 10 tests failed! *** This bug has been marked as a duplicate of bug 10179 *** Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58601 [Bug 58601] [meta-bug] alignas
[Bug c++/34747] __attribute__((aligned(x)))+__alignof != correct behaviour
--- Comment #4 from andry at inbox dot ru 2008-05-15 14:06 --- Version 4.3.0 (Release), the same tests still failing. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34747
[Bug c++/34747] __attribute__((aligned(x)))+__alignof != correct behaviour
--- Comment #3 from andry at inbox dot ru 2008-01-28 01:16 --- I build trunk (2008.01.27) and run test. Several tests still failing: FAILED: test5 FAILED: test7 FAILED: test20 FAILED: test21 FAILED: test25 FAILED: test26 FAILED: test37 FAILED: test46 FAILED: test47 FAILED: test48 10 tests failed! -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34747
[Bug c++/34747] __attribute__((aligned(x)))+__alignof != correct behaviour
--- Comment #2 from andry at inbox dot ru 2008-01-12 08:42 ---
(In reply to comment #1)
I think this is really just PR 10179 which was fixed for 4.3.0.
Could you test it on 4.3?
I tried to make trunk, but stopped with error:
configure: failed program was:
| /* confdefs.h. */
|
| #define PACKAGE_NAME GNU C Runtime Library
| #define PACKAGE_TARNAME libgcc
| #define PACKAGE_VERSION 1.0
| #define PACKAGE_STRING GNU C Runtime Library 1.0
| #define PACKAGE_BUGREPORT
| /* end confdefs.h. */
|
| int
| main ()
| {
|
| ;
| return 0;
| }
configure:2605: error: cannot compute suffix of object files: cannot compile
could you run my test on g++ 4.3 to see is that all ok?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34747
[Bug c++/34747] __attribute__((aligned(x)))+__alignof != correct behaviour
--- Comment #1 from pinskia at gcc dot gnu dot org 2008-01-12 03:27 --- I think this is really just PR 10179 which was fixed for 4.3.0. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34747
