Complain if we can't enable simd on non-x86_64.

diff --git a/configure.ac b/configure.ac
index a590af44057ac09100c85dd147f46b8034a6c331..a65b289d684c3cd976fa425e7dde98f8398fe99c 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -230,6 +230,10 @@ if test x"$enable_simd" = x"yes"; then
 Omit --enable-simd to continue without it. ($CXX, $CXX_VERSION)])
            fi
        fi
+    else
+        AC_MSG_RESULT(unavailable)
+        AC_MSG_ERROR(The SIMD optimizations are currently x86_64 only.
+Omit --enable-simd to continue.)
     fi
 fi