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Csaba Keszegh 2aa18ca3e9 fix: use CXX_STANDARD when extracting compiler flags for PCH with GNUCXX
When compiling with cmake using -DCMAKE_CXX_STANDARD=11 use `-std=gnu++11`
for PCH compiler flags, otherwise it triggers an error:

   opencv_core_Release.gch: not used because `__cplusplus' defined as ` 201103L' not ` 199711L' [-Winvalid-pch]

Use CXX_EXTENSIONS property to select `gnu++11` or `c++11`.
Trying to mimic cmake logic here: https://gitlab.kitware.com/cmake/cmake/blob/master/Source/cmLocalGenerator.cxx#L1527-1557
2018-01-16 20:32:21 +01:00
2018-01-06 16:15:43 -08:00
2017-11-07 17:24:48 +03:00
2014-02-26 17:46:52 +08:00
2016-01-18 10:11:01 +05:30
2017-09-13 17:58:34 +03:00

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