Default to building in C++ modeusers/palves/cxx-conversion

... except on hosts/targets that haven't been converted yet.

gdb/ChangeLog:
2015-11-19  Pedro Alves  <palves@redhat.com>

	* build-with-cxx.m4 (GDB_AC_BUILD_WITH_CXX): Default to yes unless
	building on some hosts.
	* configure: Renegerate.

gdb/gdbserver/ChangeLog:
2015-11-19  Pedro Alves  <palves@redhat.com>

	* configure: Renegerate.

3 files changed, 46 insertions, 6 deletions

diff --git a/gdb/build-with-cxx.m4 b/gdb/build-with-cxx.m4
index b6284fda2ff..03ff54d6291 100644
--- a/gdb/build-with-cxx.m4
+++ b/gdb/build-with-cxx.m4
@@ -21,6 +21,21 @@ dnl allowing a user to build with a C++ compiler.
 
 AC_DEFUN([GDB_AC_BUILD_WITH_CXX],
 [
+  # The "doesn't support C++ yet" hall of shame.
+  case $host in
+    *-*aix* | \
+    *-*go32* | \
+    *-*darwin* | \
+    *-*solaris* | \
+    *-*nto* | \
+    *-*bsd* | \
+    xtensa*-*-linux* | \
+    null)
+      enable_build_with_cxx=no ;;
+    *)
+      enable_build_with_cxx=yes ;;
+  esac
+
   AC_ARG_ENABLE(build-with-cxx,
   AS_HELP_STRING([--enable-build-with-cxx], [build with C++ compiler instead of C compiler]),
     [case $enableval in
@@ -28,8 +43,7 @@ AC_DEFUN([GDB_AC_BUILD_WITH_CXX],
 	  ;;
       *)
 	  AC_MSG_ERROR([bad value $enableval for --enable-build-with-cxx]) ;;
-    esac],
-    [enable_build_with_cxx=no])
+    esac])
 
   if test "$enable_build_with_cxx" = "yes"; then
     COMPILER='$(CXX)'
diff --git a/gdb/configure b/gdb/configure
index 249a39975b0..fce21548fea 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -5001,6 +5001,21 @@ program_transform_name=`$as_echo "$program_transform_name" | sed "$ac_script"`
 
 # See if we are building with C++, and substitute COMPILER.
 
+  # The "doesn't support C++ yet" hall of shame.
+  case $host in
+    *-*aix* | \
+    *-*go32* | \
+    *-*darwin* | \
+    *-*solaris* | \
+    *-*nto* | \
+    *-*bsd* | \
+    xtensa*-*-linux* | \
+    null)
+      enable_build_with_cxx=no ;;
+    *)
+      enable_build_with_cxx=yes ;;
+  esac
+
   # Check whether --enable-build-with-cxx was given.
 if test "${enable_build_with_cxx+set}" = set; then :
   enableval=$enable_build_with_cxx; case $enableval in
@@ -5009,8 +5024,6 @@ if test "${enable_build_with_cxx+set}" = set; then :
       *)
 	  as_fn_error "bad value $enableval for --enable-build-with-cxx" "$LINENO" 5 ;;
     esac
-else
-  enable_build_with_cxx=no
 fi
 
 
diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index 87dfda06eed..9b2018c7cad 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -4813,6 +4813,21 @@ fi
 
 # See if we are building with C++, and substitute COMPILER.
 
+  # The "doesn't support C++ yet" hall of shame.
+  case $host in
+    *-*aix* | \
+    *-*go32* | \
+    *-*darwin* | \
+    *-*solaris* | \
+    *-*nto* | \
+    *-*bsd* | \
+    xtensa*-*-linux* | \
+    null)
+      enable_build_with_cxx=no ;;
+    *)
+      enable_build_with_cxx=yes ;;
+  esac
+
   # Check whether --enable-build-with-cxx was given.
 if test "${enable_build_with_cxx+set}" = set; then :
   enableval=$enable_build_with_cxx; case $enableval in
@@ -4821,8 +4836,6 @@ if test "${enable_build_with_cxx+set}" = set; then :
       *)
 	  as_fn_error "bad value $enableval for --enable-build-with-cxx" "$LINENO" 5 ;;
     esac
-else
-  enable_build_with_cxx=no
 fi