From 85b0b0cd7701f03f8053a59e17cf8c6f08dffdfc Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.a.alekhin@gmail.com>
Date: Sun, 24 Jul 2022 12:19:37 +0300
Subject: [PATCH] build: add missing GCC condition for pragma

---
 modules/features2d/src/sift.simd.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/modules/features2d/src/sift.simd.hpp b/modules/features2d/src/sift.simd.hpp
index dfe113b9b3..8a038612c4 100644
--- a/modules/features2d/src/sift.simd.hpp
+++ b/modules/features2d/src/sift.simd.hpp
@@ -829,14 +829,19 @@ else // CV_8U
         v_pack_store(dst + k, __pack01);
     }
 #endif
+
+#if defined(__GNUC__) && __GNUC__ >= 9
 // avoid warning "iteration 7 invokes undefined behavior" on Linux ARM64
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Waggressive-loop-optimizations"
+#endif
     for( ; k < len; k++ )
     {
         dst[k] = saturate_cast<uchar>(rawDst[k]*nrm2);
     }
+#if defined(__GNUC__) && __GNUC__ >= 9
 #pragma GCC diagnostic pop
+#endif
 }
 #else
     float* dst = dstMat.ptr<float>(row);