[PPL-devel] [GIT] ppl/ppl(master): Check whether the C++ compiler supports some basic C++11 features.

[Roberto Bagnara]

Module: ppl/ppl
Branch: master
Commit: 3b57980822808601f0a4574070d6240967056762
URL:    http://www.cs.unipr.it/git/gitweb.cgi?p=ppl/ppl.git;a=commit;h=3b57980822808601f0a4574070d6240967056762

Author: Roberto Bagnara <roberto.bagnara at bugseng.com>
Date:   Fri Mar 28 22:31:33 2014 +0100

Check whether the C++ compiler supports some basic C++11 features.

---

 configure.ac         |    3 +-
 m4/ac_check_cxx11.m4 |   54 ++++++++++++++++++++++++++++++++++++++++++++++++++
 ppl-config.sed       |    1 +
 3 files changed, 57 insertions(+), 1 deletions(-)

diff --git a/configure.ac b/configure.ac
index 26c4a79..9d51bc0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -280,7 +280,6 @@ int main() {
   AC_LANG_POP(C++)
 fi
 
-
 AC_PROG_FGREP
 AC_PROG_EGREP
 AC_PROG_SED
@@ -1620,6 +1619,8 @@ then
   fi
 fi
 
+# Check if the C++ compiler supports C++11 features.
+AC_CHECK_CXX11
 
 AC_SUBST(LIBEXT, [$libext])
 AC_SUBST(SHREXT, [$shrext_cmds])
diff --git a/m4/ac_check_cxx11.m4 b/m4/ac_check_cxx11.m4
new file mode 100644
index 0000000..342ed34
--- /dev/null
+++ b/m4/ac_check_cxx11.m4
@@ -0,0 +1,54 @@
+dnl A function to check for the existence and usability of GMP.
+dnl Copyright (C) 2010-2014 BUGSENG srl (http://bugseng.com)
+dnl
+dnl This file is part of the Parma Polyhedra Library (PPL).
+dnl
+dnl The PPL is free software; you can redistribute it and/or modify it
+dnl under the terms of the GNU General Public License as published by the
+dnl Free Software Foundation; either version 3 of the License, or (at your
+dnl option) any later version.
+dnl
+dnl The PPL is distributed in the hope that it will be useful, but WITHOUT
+dnl ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+dnl FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+dnl for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software Foundation,
+dnl Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
+dnl
+dnl For the most up-to-date information see the Parma Polyhedra Library
+dnl site: http://bugseng.com/products/ppl/ .
+
+AC_DEFUN([AC_CHECK_CXX11],
+[
+AC_LANG_PUSH(C++)
+AC_MSG_CHECKING([if the C++ compiler supports C++11 features])
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+template <typename T>
+struct check final {
+  static constexpr T value{ __cplusplus };
+};
+
+typedef check<check<bool>> right_angle_brackets;
+
+int a;
+decltype(a) b;
+
+typedef check<int> check_type;
+check_type c{};
+check_type&& cr = static_cast<check_type&&>(c);
+
+static_assert(check_type::value == 201103L, "C++11 compiler");
+]])],
+    AC_MSG_RESULT(yes)
+    ac_cv_check_cxx11=yes,
+    AC_MSG_RESULT(no)
+    ac_cv_check_cx11=no
+  )
+AC_LANG_POP(C++)
+if test "$ac_cv_check_cxx11" = yes; then
+  AC_DEFINE(HAVE_CXX11,,
+  [Defined if the C++compiler supports C++11 features.])
+fi
+])
diff --git a/ppl-config.sed b/ppl-config.sed
index 5d6d721..dd94ee3 100644
--- a/ppl-config.sed
+++ b/ppl-config.sed
@@ -1,3 +1,4 @@
+s/\([^A-Z_]\)HAVE_CXX11/\1PPL_HAVE_CXX11/g
 s/\([^A-Z_]\)HAVE_DECL_FFS/\1PPL_HAVE_DECL_FFS/g
 s/\([^A-Z_]\)HAVE_DECL_FMA/\1PPL_HAVE_DECL_FMA/g
 s/\([^A-Z_]\)HAVE_DECL_FMAF/\1PPL_HAVE_DECL_FMAF/g