fix redefinition of argument machine

cmake/configure.cmake

@@ -50,20 +50,14 @@ if(NOT WITH_PROFILER)
 endif(NOT WITH_PROFILER)
 
 if(NOT CMAKE_CROSSCOMPILING)
-    set(SIMD_FLAG)
-    if(WITH_AVX)
-        if (AVX512F_FOUND)
-            set(SIMD_FLAG "${SIMD_FLAG} ${AVX512F_FLAG}")
-        endif()
-        if (AVX2_FOUND)
-            set(SIMD_FLAG "${SIMD_FLAG} ${AVX2_FLAG}")
-        endif()
-        if (AVX_FOUND)
-            set(SIMD_FLAG "${SIMD_FLAG} ${AVX_FLAG}")
-        endif()
-        if (SSE3_FOUND)
-            set(SIMD_FLAG "${SIMD_FLAG} ${SSE3_FLAG}")
-        endif()
+    if(WITH_AVX AND AVX512F_FOUND)
+        set(SIMD_FLAG ${AVX512F_FLAG})
+    elseif(WITH_AVX AND AVX2_FOUND)
+        set(SIMD_FLAG ${AVX2_FLAG})
+    elseif(WITH_AVX AND AVX_FOUND)
+        set(SIMD_FLAG ${AVX_FLAG})
+    elseif(SSE3_FOUND)
+        set(SIMD_FLAG ${SSE3_FLAG})
     endif()
 endif()