Bug 532044

Summary: php fails to build on ARM because of an alignment error
Product: [Fedora] Fedora Reporter: Kedar Sovani <kedars>
Component: phpAssignee: Joe Orton <jorton>
Status: CLOSED WONTFIX QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: low    
Version: 12CC: fedora, jitesh.1337, jorton, rpm
Target Milestone: ---   
Target Release: ---   
Hardware: arm9   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2010-12-03 22:36:02 EST Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Bug Depends On:    
Bug Blocks: 245418    
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Description Flags
proposed fix none

Description Kedar Sovani 2009-10-30 08:49:32 EDT
When the "php" binary is executed to create phar.php, an alignment error is encountered thus causing the build to fail.
Comment 1 Kedar Sovani 2009-10-30 08:52:10 EDT
Created attachment 366794 [details]
proposed fix

proposed fix
Comment 2 Joe Orton 2009-10-30 09:48:46 EDT
-	(z)->value = (v)->value; \
+	memcpy(&(z)->value, &(v)->value, sizeof((z)->value)); \

those are logically equivalent in C, surely?  Where's the alignment issue occurring with the use of this macro?
Comment 3 Jitesh Shah 2009-10-30 11:51:08 EDT
If (z)->value or (v)->value is improperly aligned, the first statement will fault. But, memcpy falls back to a byte-by-byte copy, thus, eliminating any unaligned accesses.
Comment 4 Kedar Sovani 2009-10-30 12:07:46 EDT
http://lecs.cs.ucla.edu/wiki/index.php/XScale_alignment
http://netwinder.osuosl.org/users/b/brianbr/public_html/alignment.html#q3

ARM expects pointers/words are aligned on word boundary. The pointer values that are passed to this assignment are now aligned on such a boundary, thus causing the problems. 

Here is the failed log:
http://arm.koji.fedoraproject.org/koji/taskinfo?taskID=75564

Here is the successful build after applying this patch:
http://arm.koji.fedoraproject.org/koji/taskinfo?taskID=75686
Comment 5 Bug Zapper 2009-11-16 09:41:04 EST
This bug appears to have been reported against 'rawhide' during the Fedora 12 development cycle.
Changing version to '12'.

More information and reason for this action is here:
http://fedoraproject.org/wiki/BugZappers/HouseKeeping
Comment 6 Bug Zapper 2010-11-04 02:58:50 EDT
This message is a reminder that Fedora 12 is nearing its end of life.
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Comment 7 Bug Zapper 2010-12-03 22:36:02 EST
Fedora 12 changed to end-of-life (EOL) status on 2010-12-02. Fedora 12 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of 
Fedora please feel free to reopen this bug against that version.

Thank you for reporting this bug and we are sorry it could not be fixed.