-# ansi-c++.m4 serial 3
-dnl Copyright (C) 2002-2003, 2005, 2010 Free Software Foundation, Inc.
+# ansi-c++.m4 serial 9
+dnl Copyright (C) 2002-2003, 2005, 2010-2013 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 It would be so nice if plus signs were supported in AC_ARG_ENABLE.
- dnl Feature request submitted on 2010-03-13.
- AC_ARG_ENABLE([cxx],
- [ --disable-cxx do not build C++ sources],
- [CXX_CHOICE="$enableval"],
- [CXX_CHOICE=yes])
+ dnl Plus signs are supported in AC_ARG_ENABLE starting with autoconf-2.66.
+ m4_version_prereq([2.66],
+ [m4_ifdef([gl_CXX_CHOICE_DEFAULT_NO],
+ [AC_ARG_ENABLE([c++],
+ [ --enable-c++ also build C++ sources],
+ [CXX_CHOICE="$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 ":" if none is found.
+# 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.
m4_if([$1], [CXX], [],
[gl_save_CXX="$CXX"])
if test "$CXX_CHOICE" = no; then
- CXX=":"
+ CXX=no
fi
if test -z "$CXX"; then
if test -n "$CCC"; then
CXX="$CCC"
else
- AC_CHECK_PROGS([CXX], [g++ c++ gpp aCC CC cxx cc++ cl FCC KCC RCC xlC_r xlC], [:])
+ AC_CHECK_TOOLS([CXX],
+ [g++ c++ gpp aCC CC cxx cc++ cl FCC KCC RCC xlC_r xlC],
+ [:])
fi
fi
- if test "$CXX" != ":"; then
+ if test "$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 $LDFLAGS) works])
AC_LANG_POP([C++])
AC_MSG_RESULT([$gl_cv_prog_ansicxx_works])
if test $gl_cv_prog_ansicxx_works = no; then
- CXX=:
+ CXX=no
else
dnl Test for namespaces.
dnl We don't bother supporting pre-ANSI-C++ compilers.
AC_LANG_POP([C++])
AC_MSG_RESULT([$gl_cv_prog_ansicxx_namespaces])
if test $gl_cv_prog_ansicxx_namespaces = no; then
- CXX=:
+ CXX=no
fi
fi
fi
CXX="$gl_save_CXX"])
AC_SUBST([$1])
- AM_CONDITIONAL([$2], [test "$$1" != ":"])
+ AM_CONDITIONAL([$2], [test "$$1" != no])
- 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])
+ 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
])