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Port my bug fix from MySQL 8.0.0:
commit 29a427db00846c70d1eee2b8e5727886c0af911d
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Author: Marko Mäkelä <marko.makela@oracle.com>
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Date: Tue Mar 29 13:20:32 2016 +0300
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Bug#22996442 INNODB: MAKE UNIV_DEBUG DEPEND ON DBUG_OFF, AND
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REPLACE REFERENCES TO DBUG_OFF
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InnoDB used two independent compile-time flags that distinguish
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debug and non-debug builds, which is confusing.
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We replace all DBUG_OFF references in InnoDB with UNIV_DEBUG.
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Also, make ut_ad() and alias of DBUG_ASSERT().
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RB: 12244
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Reviewed-by: Jimmy Yang <jimmy.yang@oracle.com>
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During the review of the above work, I was requested to replace all occurrences of #ifndef DBUG_OFF with #ifdef UNIV_DEBUG.
I would not want to do that, because DBUG_OFF is the MySQL/MariaDB native symbol, and UNIV_DEBUG is derived from that.
Also, avoiding those changes reduces the size of the commit and makes future merges from MySQL 5.7 to 10.2 easier.
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