ost_cxx.m4

贡献一份commoncpp2,有兴趣的可以研究一下

dnl Copyright (C) 1999-2001 Open Source Telecom Corporation.
dnl  
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2 of the License, or
dnl (at your option) any later version.
dnl 
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License 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 
dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
dnl 
dnl As a special exception to the GNU General Public License, if you 
dnl distribute this file as part of a program that contains a configuration 
dnl script generated by Autoconf, you may include it under the same 
dnl distribution terms that you use for the rest of that program.


AC_DEFUN([OST_CXX_PROGRAMMING],[
 AC_REQUIRE([OST_PROG_CC_POSIX])
 AC_PROG_CPP
 AC_PROG_CXX
 AC_PROG_CXXCPP

  dnl
  dnl Check for common C++ portability problems
  dnl

  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS

  dnl Check whether we have bool
  AC_CACHE_CHECK(whether ${CXX} has built-in bool type,
	ac_cv_cxx_bool_type,
	AC_TRY_COMPILE(,
	     [bool b1=true; bool b2=false;],
             ac_cv_cxx_bool_type=yes,
	     ac_cv_cxx_bool_type=no
        )
  )

  if test $ac_cv_cxx_bool_type = yes ; then
	AC_DEFINE(HAVE_BOOL_TYPE, [1], [have bool type])
  fi

  AC_LANG_RESTORE
  AH_BOTTOM([
#ifndef HAVE_BOOL_TYPE
typedef enum { true=1, false=0 } bool;
#endif


	])
])

AC_DEFUN([OST_CXX_NEW_INIT],[
 AC_REQUIRE([OST_PROG_CC_POSIX])
# AC_PROG_CPP
# AC_PROG_CXX
# AC_PROG_CXXCPP

  dnl
  dnl Check for common C++ portability problems
  dnl

  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS

  dnl Check whether we have bool
  AC_CACHE_CHECK([whether ${CXX} has new(size_t,void*)],
        ac_cv_cxx_new_init,
        AC_TRY_COMPILE([#include <new>
#include <iostream>
using namespace std;],
             [int* p1 = new int();
int* p2 = new (p1) int();
return 0;],
             ac_cv_cxx_new_init=yes,
             ac_cv_cxx_new_init=no
        )
  )

  if test $ac_cv_cxx_new_init = yes ; then
        AC_DEFINE(CCXX_HAVE_NEW_INIT, [1], [have new with init])
  fi

  AC_LANG_RESTORE
  AH_BOTTOM([
#ifdef CCXX_NAMESPACES
#define USING(x) using namespace x;
#else
#define USING(x)
#endif

#ifdef  __KCC
#define KAI_NONSTD_IOSTREAM 1
#endif
	])
])

AC_DEFUN([OST_CXX_ARRAYS],[
  AC_REQUIRE([OST_CXX_PROGRAMMING])
  dnl 
  dnl Determine C++ support for dynamic sized arrays in stack frame.
  dnl 

  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_CACHE_CHECK(wheather dynamic arrays in stack frame,
	ost_cv_cxx_array,
	AC_TRY_COMPILE(,[
	int x;
	int y\[x\];
	return 0;
	], ost_cv_cxx_array=no, ost_cv_array=yes)
  )
  if test "$ost_cv_cxx_array" = yes ; then
	AC_DEFINE(HAVE_DYN_ARRAY, [1], [c++ dynamic arrays in stack frame])
  fi
  AC_LANG_RESTORE
])
 
AC_DEFUN([OST_CXX_IOSTREAM],[
  AC_REQUIRE([OST_CXX_PROGRAMMING])
  dnl
  dnl Determine kind of C++ iostream support.
  dnl

  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_CACHE_CHECK(wheather old style iostreams,
        ost_cv_cxx_iostream,
	AC_TRY_COMPILE([
#include <iostream>
using namespace std;

class mystr : public streambuf, public iostream
{
	mystr();
};

mystr::mystr() : streambuf(), iostream((streambuf *)this)
{
}
		],[return 0;],
	ost_cv_cxx_iostream=no,
	ost_cv_cxx_iostream=yes
	)
  )
  if test $ost_cv_cxx_iostream = yes ; then
	AC_DEFINE(HAVE_OLD_IOSTREAM, [1], [old style iostreams])
  fi
  AC_CHECK_HEADERS(sstream)

  AC_LANG_RESTORE
])

AC_DEFUN([OST_CXX_NAMESPACE],[
  AC_REQUIRE([OST_CXX_PROGRAMMING])

  dnl
  dnl Determine if C++ supports namespaces.
  dnl

  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_CACHE_CHECK(whether ${CXX} supports namespace,
	ost_cv_cxx_namespace,
	AC_TRY_COMPILE([
#include <iostream>
namespace Test { using namespace std; }],[return 0;],
	ost_cv_cxx_namespace=yes,
	ost_cv_cxx_namespace=no
	)
  )

  if test "$ost_cv_cxx_namespace" = yes ; then
	AC_DEFINE(CCXX_NAMESPACES, [1], [has c++ namespaces])
  fi
  AC_LANG_RESTORE
])

AC_DEFUN([OST_CXX_MUTABLE],[
  AC_REQUIRE([OST_CXX_PROGRAMMING])

  dnl
  dnl Determine if C++ supports mutable members.
  dnl

  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS

  AC_CACHE_CHECK(whether ${CXX} supports mutable,
	ost_cv_cxx_mutable,
	AC_TRY_COMPILE([
class t {mutable int i;};], [return 0;],
	ost_cv_cxx_mutable=yes,
	ost_cv_cxx_mutable=no
	)
  )

  if test $ost_cv_cxx_mutable = no ; then
	COMMON_FLAGS="$COMMON_FLAGS -Dmutable"
  fi

  AC_LANG_RESTORE
])

AC_DEFUN([OST_CXX_NOEXCEPTIONS],[
  AC_REQUIRE([OST_CXX_PROGRAMMING])

  dnl
  dnl Disable C++ exception handling whenever possible.
  dnl

  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS

  dnl strip -fexceptions flag if used
  optflags=$CXXFLAGS
  if test ! -z "$optflags" ; then
        CXXFLAGS=""
        for opt in $optflags ; do
                case $opt in
		*rtti*)
			;;
                *exceptions*)
                        ;;
                *)
                        CXXFLAGS="$CXXFLAGS $opt"
                        ;;
                esac
        done
  fi
  AC_CACHE_CHECK(whether ${CXX} supports -fno-exceptions,
        ac_cv_cxx_noexception_flag,
        [echo 'void f(){}' >conftest.c
         if test -z "`${CXX} -fno-exceptions -c conftest.c 2>&1`"; then
                COMMON_FLAGS="$COMMON_FLAGS -fno-exceptions"
		ac_cv_cxx_noexception_flag=yes
	 else
		ac_cv_cxx_noexception_flag=no
	 fi
         rm -f conftest*
         ])

  AC_CACHE_CHECK(whether ${CXX} supports -fno-rtti,
        ac_cv_cxx_no_rtti_flag,
        [echo '#include <sstream>' >conftest.c
	 echo 'void f(){}' >>conftest.c
         if test -z "`${CXX} -fno-rtti -c conftest.c 2>&1`"; then
                COMMON_FLAGS="$COMMON_FLAGS -fno-rtti"
		ac_cv_cxx_no_rtti_flag=yes
	 else
		ac_cv_cxx_no_rtti_flag=no
	 fi
         rm -f conftest*
         ])

 AC_CACHE_CHECK(whether ${CXX} supports -fno-check-new,
        ac_cv_cxx_no_check_new_flag,
        [echo 'void f(){}' >conftest.c
         if test -z "`${CXX} -fno-check-new -c conftest.c 2>&1`"; then
                COMMON_FLAGS="$COMMON_FLAGS -fno-check-new"
                ac_cv_cxx_no_check_new_flag=yes
         else
                ac_cv_cxx_no_check_new_flag=no
         fi
         rm -f conftest*
         ])

 AC_CACHE_CHECK(whether ${CXX} supports -finline,
        ac_cv_cxx_inline_flag,
        [echo 'void f(){}' >conftest.c
         if test -z "`${CXX} -finline -c conftest.c 2>&1`"; then
                COMMON_FLAGS="$COMMON_FLAGS -finline"
                ac_cv_cxx_inline_flag=yes
         else
                ac_cv_cxx_inline_flag=no
         fi
         rm -f conftest*
         ])

  AC_LANG_RESTORE
])

AC_DEFUN([OST_CXX_EXCEPTIONS],[
  AC_REQUIRE([OST_CXX_PROGRAMMING])

  dnl 
  dnl Enable C++ exception handling whenever possible.
  dnl 

  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS

  dnl strip -fno-exceptions flag if used
  optflags=$CXXFLAGS
  if test ! -z "$optflags" ; then
	CXXFLAGS=""
	for opt in $optflags ; do
 		case $opt in
		*no-rtti*)
			;;
		*omit-frame-pointer*)
			;;
		*no-exceptions*)
			;;
		*)
			CXXFLAGS="$CXXFLAGS $opt"
			;;
		esac
	done
  fi

  dnl Check for exception handling
  AC_CACHE_CHECK(whether ${CXX} supports -fhandle-exceptions,
	ac_cv_cxx_exception_flag,
	[echo 'void f(){}' >conftest.c
	 if test -z "`${CXX} -fhandle-exceptions -c conftest.c 2>&1`"; then
		ac_cv_cxx_exception_flag=yes
		COMMON_FLAGS="$COMMON_FLAGS -fhandle-exceptions"
	 else
		ac_cv_cxx_exception_flag=no
	 fi
	 rm -f conftest*
	 ])

  if test $ac_cv_cxx_exception_flag = "yes" ; then
    ac_cv_cxx_exception_handling=yes
  else
    AC_CACHE_CHECK(whether ${CXX} supports exception handling,
	ac_cv_cxx_exception_handling,
	AC_TRY_COMPILE(
	    [void f(void) 
	     { 
		throw "abc";
	     } 
	     void g(void) 
	     { 
		try 
		{ 
		   f(); 
		} 
		catch(char*){} 
	    }
	    ],,
	    ac_cv_cxx_exception_handling=yes,
	    ac_cv_cxx_exception_handling=no
	)
    )
  fi

  if test $ac_cv_cxx_exception_handling = yes ; then
	AC_DEFINE(CCXX_EXCEPTIONS, [1], [has c++ exception handling])
	AC_CHECK_HEADERS(exception)
  fi

  AC_LANG_RESTORE
  AH_BOTTOM([
#ifndef CCXX_EXCEPTIONS
/* disable HAVE_EXCEPTION */
#ifdef  HAVE_EXCEPTION
#undef  HAVE_EXCEPTION
#endif
/* throw - replacement to throw an exception */
#define THROW(x) abort()
/* throw - replacement to declare an exception */
#define THROWS(x)
/* throw - for empty list */
#define	NEW_THROWS
#define	THROWS_EMPTY
/*
 * work around dangeling if/else combinations:
 */
#else
#define THROW(x) throw x
#define THROWS(x) throw(x)
#define	NEW_THROWS throw()
#define	THROWS_EMPTY throw()
#endif

	])
])