configure: Check that the cross-compiler that we found actually works.

configure

@@ -7054,7 +7054,24 @@ test -n "$CROSSCC" || CROSSCC="false"
 
     if test "$CROSSCC" != "false"
     then
-        CROSSTEST_DISABLE=""
+        ac_save_CC="$CC"
+        CC="$CROSSCC"
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CROSSCC works" >&5
+$as_echo_n "checking whether $CROSSCC works... " >&6; }
+        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
                            set x $CROSSCC
                            shift
                            target=""
@@ -7067,9 +7084,16 @@ test -n "$CROSSCC" || CROSSCC="false"
                            done
                            if test -n "$target"
                            then
+                               CROSSTEST_DISABLE=""
                                CROSSTARGET="$target"
 
                            fi
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+        CC="$ac_save_CC"
     fi
 fi
 

configure.ac

@@ -838,7 +838,11 @@ then
     WINE_CHECK_MINGW_PROG(CROSSCC,gcc,false)
     if test "$CROSSCC" != "false"
     then
-        CROSSTEST_DISABLE=""
+        ac_save_CC="$CC"
+        CC="$CROSSCC"
+        AC_MSG_CHECKING([whether $CROSSCC works])
+        AC_COMPILE_IFELSE(AC_LANG_PROGRAM([]),
+                          [AC_MSG_RESULT([yes])
                            set x $CROSSCC
                            shift
                            target=""
@@ -851,8 +855,11 @@ then
                            done
                            if test -n "$target"
                            then
+                               CROSSTEST_DISABLE=""
                                AC_SUBST(CROSSTARGET,"$target")
-        fi
+                           fi],
+                          [AC_MSG_RESULT([no])])
+        CC="$ac_save_CC"
     fi
 fi