common/autoconf/flags.m4

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rev 1119 : 8022177: Windows/MSYS builds broken
@@ -901,11 +901,11 @@
       [COMPILER_SUPPORTS_TARGET_BITS_FLAG=false])
   AC_SUBST(COMPILER_SUPPORTS_TARGET_BITS_FLAG)
 
   case "${TOOLCHAIN_TYPE}" in
     microsoft)
-      CFLAGS_WARNINGS_ARE_ERRORS="/WX"
+      CFLAGS_WARNINGS_ARE_ERRORS="-WX"
       ;;
     solstudio)
       CFLAGS_WARNINGS_ARE_ERRORS="-errtags -errwarn=%all"
       ;;
     gcc)