Both x86_64 GNU/Linux and x86_64 mingw-w64 build cleanly with
--enable-targets=all.  Let's drop the -fpermissive hack, in order to
let the buildbot catch C++ build regressions for us.
gdb/ChangeLog:
2015-11-19  Pedro Alves  <palves@redhat.com>
	* build-with-cxx.m4 (GDB_AC_BUILD_WITH_CXX): Remove -fpermissive.
	* configure: Regenerate.
gdb/gdbserver/ChangeLog:
2015-11-19  Pedro Alves  <palves@redhat.com>
	* configure: Regenerate.
+2015-11-19  Pedro Alves  <palves@redhat.com>
+
+       * build-with-cxx.m4 (GDB_AC_BUILD_WITH_CXX): Remove -fpermissive.
+       * configure: Regenerate.
+
 2015-11-19  Pedro Alves  <palves@redhat.com>
 
        * breakpoint.c (software_watchpoint_add_no_memory_location)
 
     [enable_build_with_cxx=no])
 
   if test "$enable_build_with_cxx" = "yes"; then
-    # We're using -fpermissive as shortcut for now.
-    COMPILER='$(CXX) -fpermissive'
+    COMPILER='$(CXX)'
    else
     COMPILER='$(CC)'
   fi
 
 
 
   if test "$enable_build_with_cxx" = "yes"; then
-    # We're using -fpermissive as shortcut for now.
-    COMPILER='$(CXX) -fpermissive'
+    COMPILER='$(CXX)'
    else
     COMPILER='$(CC)'
   fi
 
+2015-11-19  Pedro Alves  <palves@redhat.com>
+
+       * configure: Regenerate.
+
 2015-11-19  Yao Qi  <yao.qi@linaro.org>
 
        * linux-aarch64-low.c (emit_data_processing_reg): Change opcode
 
 
 
   if test "$enable_build_with_cxx" = "yes"; then
-    # We're using -fpermissive as shortcut for now.
-    COMPILER='$(CXX) -fpermissive'
+    COMPILER='$(CXX)'
    else
     COMPILER='$(CC)'
   fi