Review Request 116866: Use std::isnan on compilers that support it (fixes MinGW on Windows)

[Alex Merry]

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In general, I would prefer configure-time checks for the presence of these functions, rather than using Q_CC_ defines.  See KJS for examples of these tests.

- Alex Merry


On March 17, 2014, 8:53 p.m., Michael Hansen wrote:
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> https://git.reviewboard.kde.org/r/116866/
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> (Updated March 17, 2014, 8:53 p.m.)
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> Review request for KDE Frameworks.
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> Repository: kguiaddons
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> Description
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> Use std::isnan from <cmath> instead of isnan from <math.h>, as MinGW-32 on Windows does not include the latter.  This keeps the _isnan hack for MSVC, since that compiler doesn't include either standard version :(.
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> Diffs
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>   src/colors/kcolorutils.cpp 7df25b3d7acbb65b29513d2139d7b83de53ee4c2 
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> Diff: https://git.reviewboard.kde.org/r/116866/diff/
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> Testing
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> Compiled with MSVC10 (32-bit), MinGW 4.8 (32-bit, Windows native), and GCC 4.8 (Arch x86_64).
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> Thanks,
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> Michael Hansen
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