Module: ppl/ppl Branch: master Commit: 743d879f0284f5d2c6ab1ad4d3149082dd0c261c URL: http://www.cs.unipr.it/git/gitweb.cgi?p=ppl/ppl.git;a=commit;h=743d879f0284f... Author: Roberto Bagnara <bagnara@cs.unipr.it> Date: Sun Jan 30 20:06:05 2011 +0100 Detect whether the plain char type is signed. --- configure.ac | 3 ++ m4/Makefile.am | 1 + m4/ac_cxx_plain_char_is_signed.m4 | 55 +++++++++++++++++++++++++++++++++++++ 3 files changed, 59 insertions(+), 0 deletions(-) diff --git a/configure.ac b/configure.ac index 68934ec..6fd60e8 100644 --- a/configure.ac +++ b/configure.ac @@ -666,6 +666,9 @@ AC_SEARCH_LIBS([sqrt], [m]) # Check for the possibility to control the FPU. AC_CHECK_FPU_CONTROL +# Check whether for the C++ compiler the plain char type is signed. +AC_CXX_PLAIN_CHAR_IS_SIGNED + # Check whether the C++ compiler provides proper long doubles. AC_CXX_PROVIDES_PROPER_LONG_DOUBLE diff --git a/m4/Makefile.am b/m4/Makefile.am index a69425f..313d28a 100644 --- a/m4/Makefile.am +++ b/m4/Makefile.am @@ -46,6 +46,7 @@ ac_cxx_ieee_inexact_flag.m4 \ ac_cxx_limit_memory.m4 \ ac_cxx_long_double_binary_format.m4 \ ac_cxx_long_double_exact_output.m4 \ +ac_cxx_plain_char_is_signed.m4 \ ac_cxx_proper_long_double.m4 \ ac_cxx_remainder_bug.m4 \ ac_prog_jar.m4 \ diff --git a/m4/ac_cxx_plain_char_is_signed.m4 b/m4/ac_cxx_plain_char_is_signed.m4 new file mode 100644 index 0000000..bc0b086 --- /dev/null +++ b/m4/ac_cxx_plain_char_is_signed.m4 @@ -0,0 +1,55 @@ +dnl A function to check whether the plain char type is signed. +dnl Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it> +dnl Copyright (C) 2010-2011 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://www.cs.unipr.it/ppl/ . + +AC_DEFUN([AC_CXX_PLAIN_CHAR_IS_SIGNED], +[ +ac_save_CPPFLAGS="$CPPFLAGS" +ac_save_LIBS="$LIBS" +AC_LANG_PUSH(C++) + +AC_MSG_CHECKING([whether the plain char type is signed]) +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +#include <limits> + +int foo[std::numeric_limits<char>::is_signed ? 1 : -1]; +]])], + AC_MSG_RESULT(yes) + ac_cxx_plain_char_is_signed=yes, + AC_MSG_RESULT(no) + ac_cxx_plain_char_is_signed=no, + AC_MSG_RESULT(no) + ac_cxx_plain_char_is_signed=no) + +if test x"$ac_cxx_plain_char_is_signed" = xyes +then + value=1 +else + value=0 +fi +AC_DEFINE_UNQUOTED(PPL_CXX_PLAIN_CHAR_IS_SIGNED, $value, + [Not zero if the the plain char type is signed.]) + +AC_LANG_POP(C++) +CPPFLAGS="$ac_save_CPPFLAGS" +LIBS="$ac_save_LIBS" +])