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Bug 1279

Summary: Alignment error C2719 with AutoDiffScalar on MSVC 14
Product: Eigen Reporter: alejandro castro <alejandro.castro>
Component: Core - expression templatesAssignee: Nobody <eigen.nobody>
Status: RESOLVED DUPLICATE    
Severity: Unknown CC: chtz, gael.guennebaud, jacob.benoit.1
Priority: Normal    
Version: 3.2   
Hardware: All   
OS: Windows   
Whiteboard:

Description alejandro castro 2016-08-22 14:59:24 UTC 
I wrote in the forum here: https://forum.kde.org/viewtopic.php?f=74&t=135413

But I am think this might be bug. This happens when using AutoDiffScalar (unsupported) and compiling with MSVC14. With other platforms this error does not happen. 

I wrote a very simple test code that triggers this compilation error. You can see the version that fails here:
https://github.com/RobotLocomotion/drake/blob/5e78e6b07fa86a1ce3b873572abab42cadf3285b/drake/systems/framework/primitives/test/autodiff_alignment_test.cc

and the results of our CI here: 
https://drake-jenkins.csail.mit.edu/job/experimental/3657/


I "fix" the problem by using an unaligned vector of derivatives for the AutoDiffScalar. See commit showing the very simple diff here:
https://github.com/RobotLocomotion/drake/pull/3145/commits/359bafca05597329645e1aa953fb1c0e86af792e

Thank you in advance!
Comment 1 alejandro castro 2016-08-23 14:53:27 UTC 
This was already reported in http://eigen.tuxfamily.org/bz/show_bug.cgi?id=96.
Therefore I will close this.
Comment 2 alejandro castro 2016-08-23 14:55:55 UTC 

*** This bug has been marked as a duplicate of bug 96 ***
Comment 3 Gael Guennebaud 2016-08-23 16:23:26 UTC 
Do you confirm that the fix of bug 96 fixes your issue too? or in other words, that moving to a recent Eigen version fixes your issue?
Comment 4 Nobody 2019-12-04 16:08:09 UTC 
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