commit 3ce3e27f044935f19e93e80c43ca695262d484e1
Author: Mateusz <mateuszb@poczta.onet.pl>
Date:   Mon Jan 22 20:58:48 2018 +0100

    intrin-impl.h: do not define _xgetbv for GCC 8
    
    GCC 8 from r248028 has defined function _xgetbv and we should
    avoid double definition of this function.
    
    Signed-off-by: Mateusz Brzostek <mateuszb@poczta.onet.pl>
    Signed-off-by: Martin Storsjö <martin@martin.st>

diff --git a/mingw-w64-headers/include/psdk_inc/intrin-impl.h b/mingw-w64-headers/include/psdk_inc/intrin-impl.h
index ff9e6aff..88af804c 100644
--- a/mingw-w64-headers/include/psdk_inc/intrin-impl.h
+++ b/mingw-w64-headers/include/psdk_inc/intrin-impl.h
@@ -1775,6 +1775,7 @@ __buildmov(__movsd, unsigned __LONG32, "d")
 #define __INTRINSIC_DEFINED___movsd
 #endif /* __INTRINSIC_PROLOG */
 
+#if !defined(__GNUC__) || __GNUC__ < 8 /* GCC 8 has already defined _xgetbv */
 /* NOTE: This should be in immintrin.h */
 #if __INTRINSIC_PROLOG(_xgetbv)
 unsigned __int64 _xgetbv(unsigned int);
@@ -1798,6 +1799,7 @@ unsigned __int64 _xgetbv(unsigned int index)
 #endif
 #define __INTRINSIC_DEFINED__xgetbv
 #endif /* __INTRINSIC_PROLOG */
+#endif /* __GNUC__ < 8 */
 
 #endif /* defined(__x86_64__) || defined(_AMD64_) || defined(__i386__) || defined(_X86_) */