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# ansi-c++.m4 serial 9
dnl Copyright (C) 2002-2003, 2005, 2010-2012 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Bruno Haible.
# Sets CXX_CHOICE to 'yes' or 'no', depending on the preferred use of C++.
# The default is 'yes'. If the configure.ac contains a definition of the
# macro gl_CXX_CHOICE_DEFAULT_NO, then the default is 'no'. In both cases,
# the user can change the value by passing the option --disable-cxx or
# --enable-cxx, respectively.
AC_DEFUN([gl_CXX_CHOICE],
[
AC_MSG_CHECKING([whether to use C++])
dnl Plus signs are supported in AC_ARG_ENABLE starting with autoconf-2.66.
m4_version_prereq([2.66],
[m4_ifdef([gl_CXX_CHOICE_DEFAULT_NO],
[AC_ARG_ENABLE([c++],
[ --enable-c++ also build C++ sources],
[CXX_CHOICE="$enableval"],
[CXX_CHOICE=no])],
[AC_ARG_ENABLE([c++],
[ --disable-c++ do not build C++ sources],
[CXX_CHOICE="$enableval"],
[CXX_CHOICE=yes])])],
[m4_ifdef([gl_CXX_CHOICE_DEFAULT_NO],
[AC_ARG_ENABLE([cxx],
[ --enable-cxx also build C++ sources],
[CXX_CHOICE="$enableval"],
[CXX_CHOICE=no])],
[AC_ARG_ENABLE([cxx],
[ --disable-cxx do not build C++ sources],
[CXX_CHOICE="$enableval"],
[CXX_CHOICE=yes])])])
AC_MSG_RESULT([$CXX_CHOICE])
AC_SUBST([CXX_CHOICE])
])
# gl_PROG_ANSI_CXX([ANSICXX_VARIABLE], [ANSICXX_CONDITIONAL])
# Sets ANSICXX_VARIABLE to the name of a sufficiently ANSI C++ compliant
# compiler, or to "no" if none is found.
# Defines the Automake condition ANSICXX_CONDITIONAL to true if such a compiler
# was found, or to false if not.
AC_DEFUN([gl_PROG_ANSI_CXX],
[
AC_REQUIRE([gl_CXX_CHOICE])
m4_if([$1], [CXX], [],
[gl_save_CXX="$CXX"])
if test "$CXX_CHOICE" = no; then
CXX=no
fi
if test -z "$CXX"; then
if test -n "$CCC"; then
CXX="$CCC"
else
AC_CHECK_TOOLS([CXX],
[g++ c++ gpp aCC CC cxx cc++ cl FCC KCC RCC xlC_r xlC],
[:])
fi
fi
if test "$CXX" != no; then
dnl Use a modified version of AC_PROG_CXX_WORKS that does not exit
dnl upon failure.
AC_MSG_CHECKING([whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) works])
AC_LANG_PUSH([C++])
AC_ARG_VAR([CXX], [C++ compiler command])
AC_ARG_VAR([CXXFLAGS], [C++ compiler flags])
echo 'int main () { return 0; }' > conftest.$ac_ext
if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
gl_cv_prog_ansicxx_works=yes
if (./conftest; exit) 2>/dev/null; then
gl_cv_prog_ansicxx_cross=no
else
gl_cv_prog_ansicxx_cross=yes
fi
else
gl_cv_prog_ansicxx_works=no
fi
rm -fr conftest*
AC_LANG_POP([C++])
AC_MSG_RESULT([$gl_cv_prog_ansicxx_works])
if test $gl_cv_prog_ansicxx_works = no; then
CXX=no
else
dnl Test for namespaces.
dnl We don't bother supporting pre-ANSI-C++ compilers.
AC_MSG_CHECKING([whether the C++ compiler supports namespaces])
AC_LANG_PUSH([C++])
cat <<EOF > conftest.$ac_ext
#include <iostream>
namespace test { using namespace std; }
std::ostream* ptr;
int main () { return 0; }
EOF
if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
gl_cv_prog_ansicxx_namespaces=yes
else
gl_cv_prog_ansicxx_namespaces=no
fi
rm -fr conftest*
AC_LANG_POP([C++])
AC_MSG_RESULT([$gl_cv_prog_ansicxx_namespaces])
if test $gl_cv_prog_ansicxx_namespaces = no; then
CXX=no
fi
fi
fi
m4_if([$1], [CXX], [],
[$1="$CXX"
CXX="$gl_save_CXX"])
AC_SUBST([$1])
AM_CONDITIONAL([$2], [test "$$1" != no])
if test "$$1" != no; then
dnl This macro invocation resolves an automake error:
dnl /usr/local/share/automake-1.11/am/depend2.am: am__fastdepCXX does not appear in AM_CONDITIONAL
dnl /usr/local/share/automake-1.11/am/depend2.am: The usual way to define 'am__fastdepCXX' is to add 'AC_PROG_CXX'
dnl /usr/local/share/automake-1.11/am/depend2.am: to 'configure.ac' and run 'aclocal' and 'autoconf' again.
_AM_DEPENDENCIES([CXX])
else
AM_CONDITIONAL([am__fastdepCXX], [false])
fi
])
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