From 30d916546860d3d19f8d91a0ab4bc99f9c350aaa Mon Sep 17 00:00:00 2001
From: Stepan Neretin <slpmcf@gmail.com>
Date: Sat, 10 May 2025 16:37:13 +0700
Subject: [PATCH v4 2/6] Fix compilation on systems where <immintrin.h> is not
 available or inappropriate, such as older GCC versions or non-x86 platforms.

---
 src/include/storage/checksum_impl.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/include/storage/checksum_impl.h b/src/include/storage/checksum_impl.h
index 5ea1f698b57..042ee8af120 100644
--- a/src/include/storage/checksum_impl.h
+++ b/src/include/storage/checksum_impl.h
@@ -112,7 +112,9 @@
 #include <cpuid.h>
 #endif
 
+#ifdef HAVE_XSAVE_INTRINSICS
 #include <immintrin.h>
+#endif
 
 #if defined(HAVE__CPUID) || defined(HAVE__CPUIDEX)
 #include <intrin.h>
@@ -253,10 +255,6 @@ pg_checksum_block_##ISANAME(const PGChecksummablePage *page) \
 }
 
 /* Declarations are always defined to make dynamic dispatch code simpler */
-
-PG_DECLARE_CHECKSUM_ISA(default);
-PG_DECLARE_CHECKSUM_ISA(avx2);
-
 PG_DEFINE_CHECKSUM_ISA(default);
 #ifdef USE_AVX2_WITH_RUNTIME_CHECK
 PG_DEFINE_CHECKSUM_ISA(avx2);
-- 
2.43.0