2007-11-25 Tatsuhiro Tsujikawa <tujikawa at rednoah dot com>

	Added the check to see whether ares_host_callback accepts 
timeouts
	with c-ares; only c-ares 1.5.0 or newer accepts it.
	* src/NameResolver.{h, cc}
	* m4/libcares.m4
	* configure.ac: Set C++ for language choice.

ChangeLog

@@ -1,3 +1,11 @@
+2007-11-25  Tatsuhiro Tsujikawa  <tujikawa at rednoah dot com>
+
+	Added the check to see whether ares_host_callback accepts timeouts
+	with c-ares; only c-ares 1.5.0 or newer accepts it.
+	* src/NameResolver.{h, cc}
+	* m4/libcares.m4
+	* configure.ac: Set C++ for language choice.
+
 2007-11-24  Tatsuhiro Tsujikawa  <tujikawa at rednoah dot com>
 
 	Fixed: compilation fails without c-ares/ares

Makefile.in

@@ -99,12 +99,12 @@ CATOBJEXT = @CATOBJEXT@
 CC = @CC@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
-CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
 CPPUNIT_CFLAGS = @CPPUNIT_CFLAGS@
 CPPUNIT_CONFIG = @CPPUNIT_CONFIG@
 CPPUNIT_LIBS = @CPPUNIT_LIBS@
 CXX = @CXX@
+CXXCPP = @CXXCPP@
 CXXDEPMODE = @CXXDEPMODE@
 CXXFLAGS = @CXXFLAGS@
 CYGPATH_W = @CYGPATH_W@

config.h.in

@@ -138,6 +138,9 @@
 /* Define to 1 if you have libcares. */
 #undef HAVE_LIBCARES
 
+/* Define 1 if ares_host_callback accepts timeouts(c-ares >= 1.5) */
+#undef HAVE_LIBCARES1_5
+
 /* Define to 1 if you have libgcrypt. */
 #undef HAVE_LIBGCRYPT
 

configure

@@ -738,7 +738,7 @@ ENABLE_METALINK_FALSE
 ENABLE_ASYNC_DNS_TRUE
 ENABLE_ASYNC_DNS_FALSE
 ALLOCA
-CPP
+CXXCPP
 GREP
 EGREP
 MKINSTALLDIRS
@@ -795,7 +795,7 @@ CC
 CFLAGS
 YACC
 YFLAGS
-CPP'
+CXXCPP'
 
 
 # Initialize some variables set by options.
@@ -1424,7 +1424,7 @@ Some influential environment variables:
   YFLAGS      The list of arguments that will be passed by default to $YACC.
               This script will default YFLAGS to the empty string to avoid a
               default value of `-d' given by some make applications.
-  CPP         C preprocessor
+  CXXCPP      C++ preprocessor
 
 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.
@@ -4452,6 +4452,14 @@ done
 test -n "$YACC" || YACC="yacc"
 
 
+# Setting language choice
+ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+
 # Checks for libraries.
 if test "x$with_libxml2" = "xyes"; then
 
@@ -4730,7 +4738,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -5010,7 +5018,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -5269,7 +5277,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -5331,7 +5339,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -5427,7 +5435,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -5532,7 +5540,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -5588,7 +5596,7 @@ LIBS_save=$LIBS
 CPPFLAGS_save=$CPPFLAGS
 
 LIBS="-L$libcares_prefix_lib $LIBS"
-CPPFLAGS="-I$libcares_prefix_include $CPPFLAGS"
+CPPFLAGS="-I$libcares_prefix_include -Wall $CPPFLAGS"
 
 { echo "$as_me:$LINENO: checking for ares_init in -lcares" >&5
 echo $ECHO_N "checking for ares_init in -lcares... $ECHO_C" >&6; }
@@ -5633,7 +5641,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -5655,8 +5663,71 @@ if test $ac_cv_lib_cares_ares_init = yes; then
   have_libcares=yes
 fi
 
+
 if test "x$have_libcares" = "xyes"; then
 
+    { echo "$as_me:$LINENO: checking whether ares_host_callback accepts timeouts(c-ares >= 1.5)" >&5
+echo $ECHO_N "checking whether ares_host_callback accepts timeouts(c-ares >= 1.5)... $ECHO_C" >&6; }
+    cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+    #include <ares.h>
+
+    void callback(void* arg, int status, int timeouts, struct hostent* host);
+
+int
+main ()
+{
+
+    ares_channel channel;
+    ares_gethostbyname(channel, "foo", 0, callback, 0);
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_cxx_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then
+  have_libcares1_5=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	have_libcares1_5=no
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+    { echo "$as_me:$LINENO: result: $have_libcares1_5" >&5
+echo "${ECHO_T}$have_libcares1_5" >&6; }
+
+    if test "x$have_libcares1_5" = "xyes"; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_LIBCARES1_5 1
+_ACEOF
+
+    fi
+
+
 cat >>confdefs.h <<\_ACEOF
 #define HAVE_LIBCARES 1
 _ACEOF
@@ -5741,7 +5812,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -5911,26 +5982,22 @@ fi
 fi
 
 # Checks for header files.
-ac_ext=c
-ac_cpp='$CPP $CPPFLAGS'
-ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_c_compiler_gnu
-{ echo "$as_me:$LINENO: checking how to run the C preprocessor" >&5
-echo $ECHO_N "checking how to run the C preprocessor... $ECHO_C" >&6; }
-# On Suns, sometimes $CPP names a directory.
-if test -n "$CPP" && test -d "$CPP"; then
-  CPP=
-fi
-if test -z "$CPP"; then
-  if test "${ac_cv_prog_CPP+set}" = set; then
+ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+{ echo "$as_me:$LINENO: checking how to run the C++ preprocessor" >&5
+echo $ECHO_N "checking how to run the C++ preprocessor... $ECHO_C" >&6; }
+if test -z "$CXXCPP"; then
+  if test "${ac_cv_prog_CXXCPP+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
-      # Double quotes because CPP needs to be expanded
-    for CPP in "$CC -E" "$CC -E -traditional-cpp" "/lib/cpp"
+      # Double quotes because CXXCPP needs to be expanded
+    for CXXCPP in "$CXX -E" "/lib/cpp"
     do
       ac_preproc_ok=false
-for ac_c_preproc_warn_flag in '' yes
+for ac_cxx_preproc_warn_flag in '' yes
 do
   # Use a header file that comes with gcc, so configuring glibc
   # with a fresh cross-compiler works.
@@ -5964,7 +6031,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_preproc_warn_flag$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        }; then
   :
@@ -6001,7 +6068,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_preproc_warn_flag$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        }; then
   # Broken: success on invalid input.
@@ -6025,17 +6092,17 @@ if $ac_preproc_ok; then
 fi
 
     done
-    ac_cv_prog_CPP=$CPP
+    ac_cv_prog_CXXCPP=$CXXCPP
 
 fi
-  CPP=$ac_cv_prog_CPP
+  CXXCPP=$ac_cv_prog_CXXCPP
 else
-  ac_cv_prog_CPP=$CPP
+  ac_cv_prog_CXXCPP=$CXXCPP
 fi
-{ echo "$as_me:$LINENO: result: $CPP" >&5
-echo "${ECHO_T}$CPP" >&6; }
+{ echo "$as_me:$LINENO: result: $CXXCPP" >&5
+echo "${ECHO_T}$CXXCPP" >&6; }
 ac_preproc_ok=false
-for ac_c_preproc_warn_flag in '' yes
+for ac_cxx_preproc_warn_flag in '' yes
 do
   # Use a header file that comes with gcc, so configuring glibc
   # with a fresh cross-compiler works.
@@ -6069,7 +6136,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_preproc_warn_flag$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        }; then
   :
@@ -6106,7 +6173,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_preproc_warn_flag$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        }; then
   # Broken: success on invalid input.
@@ -6128,18 +6195,18 @@ rm -f conftest.err conftest.$ac_ext
 if $ac_preproc_ok; then
   :
 else
-  { { echo "$as_me:$LINENO: error: C preprocessor \"$CPP\" fails sanity check
+  { { echo "$as_me:$LINENO: error: C++ preprocessor \"$CXXCPP\" fails sanity check
 See \`config.log' for more details." >&5
-echo "$as_me: error: C preprocessor \"$CPP\" fails sanity check
+echo "$as_me: error: C++ preprocessor \"$CXXCPP\" fails sanity check
 See \`config.log' for more details." >&2;}
    { (exit 1); exit 1; }; }
 fi
 
-ac_ext=c
-ac_cpp='$CPP $CPPFLAGS'
-ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_c_compiler_gnu
+ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
 
 { echo "$as_me:$LINENO: checking for grep that handles long lines and -e" >&5
@@ -6342,7 +6409,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_cv_header_stdc=yes
@@ -6521,7 +6588,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   eval "$as_ac_Header=yes"
@@ -6584,7 +6651,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -6664,7 +6731,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -6797,7 +6864,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -6971,7 +7038,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_header_compiler=yes
@@ -7010,7 +7077,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_preproc_warn_flag$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        }; then
   ac_header_preproc=yes
@@ -7026,7 +7093,7 @@ rm -f conftest.err conftest.$ac_ext
 echo "${ECHO_T}$ac_header_preproc" >&6; }
 
 # So?  What about this header?
-case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+case $ac_header_compiler:$ac_header_preproc:$ac_cxx_preproc_warn_flag in
   yes:no: )
     { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
 echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
@@ -7179,7 +7246,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_cv_header_stdbool_h=yes
@@ -7232,7 +7299,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_cv_type__Bool=yes
@@ -7347,7 +7414,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_cv_c_const=yes
@@ -7404,7 +7471,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_cv_c_inline=$ac_kw
@@ -7477,7 +7544,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_cv_type_size_t=yes
@@ -7540,7 +7607,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_cv_header_time=yes
@@ -7601,7 +7668,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_cv_struct_tm=time.h
@@ -7661,7 +7728,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_cv_c_volatile=yes
@@ -8038,7 +8105,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -8100,7 +8167,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_cv_type_off_t=yes
@@ -8166,7 +8233,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_header_compiler=yes
@@ -8205,7 +8272,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_preproc_warn_flag$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        }; then
   ac_header_preproc=yes
@@ -8221,7 +8288,7 @@ rm -f conftest.err conftest.$ac_ext
 echo "${ECHO_T}$ac_header_preproc" >&6; }
 
 # So?  What about this header?
-case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+case $ac_header_compiler:$ac_header_preproc:$ac_cxx_preproc_warn_flag in
   yes:no: )
     { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
 echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
@@ -8339,7 +8406,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -8735,7 +8802,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   jm_ac_cv_header_inttypes_h=yes
@@ -8794,7 +8861,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   jm_ac_cv_header_stdint_h=yes
@@ -8853,7 +8920,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -8936,7 +9003,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   gt_cv_header_inttypes_h=yes
@@ -9002,7 +9069,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   gt_cv_inttypes_pri_broken=no
@@ -9622,7 +9689,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_header_compiler=yes
@@ -9661,7 +9728,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_preproc_warn_flag$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        }; then
   ac_header_preproc=yes
@@ -9677,7 +9744,7 @@ rm -f conftest.err conftest.$ac_ext
 echo "${ECHO_T}$ac_header_preproc" >&6; }
 
 # So?  What about this header?
-case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+case $ac_header_compiler:$ac_header_preproc:$ac_cxx_preproc_warn_flag in
   yes:no: )
     { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
 echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
@@ -9819,7 +9886,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -9916,7 +9983,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -9965,7 +10032,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -10054,7 +10121,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   am_cv_proto_iconv_arg1=""
@@ -10116,7 +10183,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -10178,7 +10245,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -10364,7 +10431,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -10807,7 +10874,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -10859,7 +10926,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -11067,7 +11134,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -11138,7 +11205,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_header_compiler=yes
@@ -11177,7 +11244,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_preproc_warn_flag$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        }; then
   ac_header_preproc=yes
@@ -11193,7 +11260,7 @@ rm -f conftest.err conftest.$ac_ext
 echo "${ECHO_T}$ac_header_preproc" >&6; }
 
 # So?  What about this header?
-case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+case $ac_header_compiler:$ac_header_preproc:$ac_cxx_preproc_warn_flag in
   yes:no: )
     { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
 echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
@@ -11373,7 +11440,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_header_compiler=yes
@@ -11412,7 +11479,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_preproc_warn_flag$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        }; then
   ac_header_preproc=yes
@@ -11428,7 +11495,7 @@ rm -f conftest.err conftest.$ac_ext
 echo "${ECHO_T}$ac_header_preproc" >&6; }
 
 # So?  What about this header?
-case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+case $ac_header_compiler:$ac_header_preproc:$ac_cxx_preproc_warn_flag in
   yes:no: )
     { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
 echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
@@ -11702,7 +11769,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_header_compiler=yes
@@ -11741,7 +11808,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_preproc_warn_flag$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        }; then
   ac_header_preproc=yes
@@ -11757,7 +11824,7 @@ rm -f conftest.err conftest.$ac_ext
 echo "${ECHO_T}$ac_header_preproc" >&6; }
 
 # So?  What about this header?
-case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+case $ac_header_compiler:$ac_header_preproc:$ac_cxx_preproc_warn_flag in
   yes:no: )
     { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
 echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
@@ -11875,7 +11942,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -12128,7 +12195,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_header_compiler=yes
@@ -12167,7 +12234,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } >/dev/null && {
-	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_preproc_warn_flag$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        }; then
   ac_header_preproc=yes
@@ -12183,7 +12250,7 @@ rm -f conftest.err conftest.$ac_ext
 echo "${ECHO_T}$ac_header_preproc" >&6; }
 
 # So?  What about this header?
-case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+case $ac_header_compiler:$ac_header_preproc:$ac_cxx_preproc_warn_flag in
   yes:no: )
     { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
 echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
@@ -12279,7 +12346,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest.$ac_objext; then
   ac_cv_func_select_args="$ac_arg1,$ac_arg234,$ac_arg5"; break 3
@@ -12553,7 +12620,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -12640,7 +12707,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -12769,7 +12836,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -12864,7 +12931,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -12978,7 +13045,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -13092,7 +13159,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -13206,7 +13273,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -13320,7 +13387,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -13434,7 +13501,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -13548,7 +13615,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -13662,7 +13729,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
+	 test -z "$ac_cxx_werror_flag" ||
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext &&
        $as_test_x conftest$ac_exeext; then
@@ -14744,7 +14811,7 @@ ENABLE_METALINK_FALSE!$ENABLE_METALINK_FALSE$ac_delim
 ENABLE_ASYNC_DNS_TRUE!$ENABLE_ASYNC_DNS_TRUE$ac_delim
 ENABLE_ASYNC_DNS_FALSE!$ENABLE_ASYNC_DNS_FALSE$ac_delim
 ALLOCA!$ALLOCA$ac_delim
-CPP!$CPP$ac_delim
+CXXCPP!$CXXCPP$ac_delim
 GREP!$GREP$ac_delim
 EGREP!$EGREP$ac_delim
 MKINSTALLDIRS!$MKINSTALLDIRS$ac_delim

configure.ac

@@ -40,6 +40,9 @@ AC_PROG_INSTALL
 AC_PROG_RANLIB
 AC_PROG_YACC
 
+# Setting language choice
+AC_LANG([C++])
+
 # Checks for libraries.
 if test "x$with_libxml2" = "xyes"; then
    AM_PATH_XML2([2.6.24], [have_libxml2=yes])

doc/Makefile.in

@@ -77,12 +77,12 @@ CATOBJEXT = @CATOBJEXT@
 CC = @CC@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
-CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
 CPPUNIT_CFLAGS = @CPPUNIT_CFLAGS@
 CPPUNIT_CONFIG = @CPPUNIT_CONFIG@
 CPPUNIT_LIBS = @CPPUNIT_LIBS@
 CXX = @CXX@
+CXXCPP = @CXXCPP@
 CXXDEPMODE = @CXXDEPMODE@
 CXXFLAGS = @CXXFLAGS@
 CYGPATH_W = @CYGPATH_W@

m4/Makefile.in

@@ -73,12 +73,12 @@ CATOBJEXT = @CATOBJEXT@
 CC = @CC@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
-CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
 CPPUNIT_CFLAGS = @CPPUNIT_CFLAGS@
 CPPUNIT_CONFIG = @CPPUNIT_CONFIG@
 CPPUNIT_LIBS = @CPPUNIT_LIBS@
 CXX = @CXX@
+CXXCPP = @CXXCPP@
 CXXDEPMODE = @CXXDEPMODE@
 CXXFLAGS = @CXXFLAGS@
 CYGPATH_W = @CYGPATH_W@

m4/libcares.m4

@@ -16,10 +16,30 @@ LIBS_save=$LIBS
 CPPFLAGS_save=$CPPFLAGS
 
 LIBS="-L$libcares_prefix_lib $LIBS"
-CPPFLAGS="-I$libcares_prefix_include $CPPFLAGS"
+CPPFLAGS="-I$libcares_prefix_include -Wall $CPPFLAGS"
 
 AC_CHECK_LIB([cares], [ares_init], [have_libcares=yes])
+
 if test "x$have_libcares" = "xyes"; then
+
+    AC_MSG_CHECKING([whether ares_host_callback accepts timeouts(c-ares >= 1.5)])
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+    #include <ares.h>
+
+    void callback(void* arg, int status, int timeouts, struct hostent* host);
+    ]],
+    [[
+    ares_channel channel;
+    ares_gethostbyname(channel, "foo", 0, callback, 0);
+    ]])],
+    [have_libcares1_5=yes],
+    [have_libcares1_5=no])
+    AC_MSG_RESULT([$have_libcares1_5])
+
+    if test "x$have_libcares1_5" = "xyes"; then
+        AC_DEFINE([HAVE_LIBCARES1_5], [1], [Define 1 if ares_host_callback accepts timeouts(c-ares >= 1.5)])
+    fi
+
     AC_DEFINE([HAVE_LIBCARES], [1], [Define to 1 if you have libcares.])
     LIBCARES_LIBS="-L$libcares_prefix_lib -lcares"
     LIBCARES_CPPFLAGS="-I$libcares_prefix_include"

src/Makefile.in

@@ -518,12 +518,12 @@ CATOBJEXT = @CATOBJEXT@
 CC = @CC@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
-CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
 CPPUNIT_CFLAGS = @CPPUNIT_CFLAGS@
 CPPUNIT_CONFIG = @CPPUNIT_CONFIG@
 CPPUNIT_LIBS = @CPPUNIT_LIBS@
 CXX = @CXX@
+CXXCPP = @CXXCPP@
 CXXDEPMODE = @CXXDEPMODE@
 CXXFLAGS = @CXXFLAGS@
 CYGPATH_W = @CYGPATH_W@

src/NameResolver.cc

@@ -36,7 +36,11 @@
 
 #ifdef ENABLE_ASYNC_DNS
 
+#ifdef HAVE_LIBCARES1_5
+void callback(void* arg, int status, int timeouts, struct hostent* host) {
+#else
 void callback(void* arg, int status, struct hostent* host) {
+#endif // HAVE_LIBCARES1_5
   NameResolver* resolverPtr = (NameResolver*)arg;
 #ifdef HAVE_LIBARES
   // This block is required since the assertion in ares_strerror fails

src/NameResolver.h

@@ -48,10 +48,18 @@ extern "C" {
 } /* end of extern "C" */
 #endif
 
+#ifdef HAVE_LIBCARES1_5
+void callback(void* arg, int status, int timeouts, struct hostent* host);
+#else
 void callback(void* arg, int status, struct hostent* host);
+#endif // HAVE_LIBCARES1_5
 
 class NameResolver {
+#ifdef HAVE_LIBCARES1_5
+  friend void callback(void* arg, int status, int timeouts, struct hostent* host);
+#else
   friend void callback(void* arg, int status, struct hostent* host);
+#endif // HAVE_LIBCARES1_5
 
 public:
   enum STATUS {