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[Issue 5439] New: 64bit struct alignment inconsistent with C ABI
Jan 09, 2011
Iain Buclaw
Jan 09, 2011
Iain Buclaw
Jan 11, 2011
Walter Bright
January 09, 2011
Gravatar of Iain BuclawPosted by Iain BuclawReply
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http://d.puremagic.com/issues/show_bug.cgi?id=5439

           Summary: 64bit struct alignment inconsistent with C ABI
           Product: D
           Version: D1 & D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: ibuclaw@ubuntu.com


--- Comment #0 from Iain Buclaw <ibuclaw@ubuntu.com> 2011-01-09 11:03:22 PST ---
This was caused by bug2821. On 64bit, doubles are 8-byte aligned, not 4, so

struct { long, short }

Should have a sizeof = 16, not 12.

Btw, would be nice if you offered a -malign-double type flag to say "Yes, I want 8 byte aligned doubles on 32bit Linux" :)

Regards

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January 09, 2011
Gravatar of Iain BuclawPosted by Iain Buclaw
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http://d.puremagic.com/issues/show_bug.cgi?id=5439


Iain Buclaw <ibuclaw@ubuntu.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ibuclaw@ubuntu.com


--- Comment #1 from Iain Buclaw <ibuclaw@ubuntu.com> 2011-01-09 11:05:08 PST ---
To save you searching for it, lookup "TypeBasic::alignsize"

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January 11, 2011
Gravatar of Walter BrightPosted by Walter Bright
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http://d.puremagic.com/issues/show_bug.cgi?id=5439


Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla@digitalmars.com
         Resolution|                            |FIXED


--- Comment #2 from Walter Bright <bugzilla@digitalmars.com> 2011-01-11 00:05:55 PST ---
http://www.dsource.org/projects/dmd/changeset/861

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