Обсуждение: pgsql: Work around gcc 4.6.0 bug that breaks WAL replay.

Work around gcc 4.6.0 bug that breaks WAL replay.

ReadRecord's habit of using both direct references to tmpRecPtr and
references to *RecPtr (which is pointing at tmpRecPtr) triggers an
optimization bug in gcc 4.6.0, which apparently has forgotten about
aliasing rules.  Avoid the compiler bug, and make the code more readable
to boot, by getting rid of the direct references.  Improve the comments
while at it.

Back-patch to all supported versions, in case they get built with 4.6.0.

Tom Lane, with some cosmetic suggestions from Alex Hunsaker

Branch
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REL8_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/6ab58354df4000372f6b098c3a55fa5a1681569f

Modified Files
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src/backend/access/transam/xlog.c |   20 +++++++++++---------
1 files changed, 11 insertions(+), 9 deletions(-)