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Make sure to use defined(__GNUC__) instead of bare __GNUC__ in flann2 header.

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This fixes a compiler error on MSVC with Unreal Engine (at least).
This commit is contained in:
TheGoddessInari 2019-07-28 10:21:15 -07:00
parent 3debb98805
commit 4e998c9ade
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1 changed files with 1 additions and 1 deletions
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modules/flann/include/opencv2/flann/dist.h
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@ -441,7 +441,7 @@ struct Hamming
result = vgetq_lane_s32 (vreinterpretq_s32_u64(bitSet2),0);
result += vgetq_lane_s32 (vreinterpretq_s32_u64(bitSet2),2);
}
#elif __GNUC__
#elif defined(__GNUC__)
{
//for portability just use unsigned long -- and use the __builtin_popcountll (see docs for __builtin_popcountll)
typedef unsigned long long pop_t;