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Silence MSVC warnings about redefinition of isnan
authorAndrew Dunstan <andrew@dunslane.net>
Sun, 18 Nov 2018 17:36:31 +0000 (12:36 -0500)
committerAndrew Dunstan <andrew@dunslane.net>
Sun, 18 Nov 2018 17:36:31 +0000 (12:36 -0500)
commitd5d7f7f3b78e00009ee87ad01d1fb87b28968f65
tree5672298ae5e372d24b7c76354105ba9c8ca5374ctree
parent0b59b0e8bcc9e85bad6fffa7828344db1a36f20acommit | diff
Silence MSVC warnings about redefinition of isnan

Some versions of perl.h define isnan when the compiler is MSVC. To avoid
warnings about this, undefine the symbol before including perl.h and
re-add the definition afterwards if it wasn't recreated.

Discussion: https://postgr.es/m/caf0568e-3c1f-07fd-6914-d903f22560f2@2ndQuadrant.com
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