Autoconf now uses --enable-cxx11 by default.

By default, the DCMTK is now compiled with C++11 support when using
Autoconf (and if C++11 is supported by the compiler that is used).

The default settings of the CMake build system with also change soon.

INSTALL

@@ -430,8 +430,10 @@ workarounds and fallback implementations.  This can be achieved using CMake's
 variables "CMAKE_CXX_STANDARD" and "CMAKE_CXX_STANDARD_REQUIRED".
 The previous mechanism only handled C++11 and is available on old versions of
 CMake (versions prior 3.1.3): set "DCMTK_ENABLE_CXX11" to "ON".  For Autoconf,
-use the "--enable-cxx11" argument.  Both the "DCMTK_ENABLE_CXX11" variable and
-Autoconf support are now deprecated and will be removed in a future release.
+the configure option "--enable-cxx11" is used by default (starting with DCMTK
+3.6.9, before is was disabled by default).  Both the "DCMTK_ENABLE_CXX11"
+variable and Autoconf support are deprecated and will be removed in a future
+release.
 
 Enabling e.g. C++11 will change some parts of DCMTK's API, so a C++11 build of
 DCMTK is potentially incompatible with a classic build of DCMTK.  This setting
@@ -1040,8 +1042,8 @@ options are:
   --enable-charconv=TYPE  enable character set conversion support
                           (libiconv/libicu/stdlibc/oficonv=default)
   --disable-charconv      disable character set conversion support
-  --enable-cxx11          use C++11
-  --disable-cxx11         do not use C++11 (default)
+  --enable-cxx11          use C++11 (default)
+  --disable-cxx11         do not use C++11
   --enable-stl            use C++ STL
   --disable-stl           do not use C++ STL (default)
 
@@ -1116,4 +1118,4 @@ Have fun.
 M. Eichelberg, J. Riesmeier, M. Onken, J. Schlamelcher
 DCMTK Development Team, Oldenburg, Germany.
 
-Last revised: 2024-02-19 (Riesmeier)
+Last revised: 2024-02-24 (Riesmeier)

config/configure

@@ -1408,8 +1408,8 @@ Optional Features:
                           enable builtin oficonv data files
   --disable-builtin-oficonv
                           disable builtin oficonv data files (default)
-  --enable-cxx11          use C++11
-  --disable-cxx11         do not use C++11 (default)
+  --enable-cxx11          use C++11 (default)
+  --disable-cxx11         do not use C++11
   --enable-stl            use C++ STL
   --disable-stl           do not use C++ STL (default)
   --enable-stl-vector     use C++ STL vector
@@ -17660,7 +17660,7 @@ fi
 
 
 
-ac_enable_cxx11="no"
+ac_enable_cxx11="yes"
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to enable C++11 support" >&5
 $as_echo_n "checking whether to enable C++11 support... " >&6; }
 # Check whether --enable-cxx11 was given.

config/configure.in

@@ -1641,11 +1641,11 @@ dnl -------------------------------------------------------
 dnl Include config test code from config/tests
 dnl -------------------------------------------------------
 
-ac_enable_cxx11="no"
+ac_enable_cxx11="yes"
 AC_MSG_CHECKING(whether to enable C++11 support)
 AC_ARG_ENABLE(cxx11,
-[  --enable-cxx11          use C++11
-  --disable-cxx11         do not use C++11 (default)],
+[  --enable-cxx11          use C++11 (default)
+  --disable-cxx11         do not use C++11],
 [ case "$enableval" in
   yes)
    AC_MSG_RESULT()