cmake: fix popcnt detection

via GCC/Clang __POPCNT__ define

cmake: fix popcnt detection
via GCC/Clang __POPCNT__ define
a2d6fc7a · Alexander Alekhin · ff6ce6cd · a2d6fc7a
Commit a2d6fc7a authored Apr 24, 2018 by Alexander Alekhin
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cpu_popcnt.cpp cmake/checks/cpu_popcnt.cpp +3 -1

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--- a/cmake/checks/cpu_popcnt.cpp
+++ b/cmake/checks/cpu_popcnt.cpp
@@ -4,12 +4,14 @@
 #    define CV_POPCNT_U64 _mm_popcnt_u64
 #  endif
 #  define CV_POPCNT_U32 _mm_popcnt_u32
-#else
+#elif defined(__POPCNT__)
 #  include <popcntintrin.h>
 #  if defined(__x86_64__)
 #    define CV_POPCNT_U64 __builtin_popcountll
 #  endif
 #  define CV_POPCNT_U32 __builtin_popcount
+#else
+#  error "__POPCNT__ is not defined by compiler"
 #endif

 int main()