ref: 1a8846b50eb297b9faa06e1273b1589a7ee833ca
dir: /common/id3lib/m4/lf_cxx.m4/
dnl Autoconf support for C++ dnl Copyright (C) 1988 Eleftherios Gkioulekas <[email protected]> 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. # ----------------------------------------------------------------- # This macro should be called to configure your C++ compiler. # When called, the macro does the following things: # 1. It finds an appropriate C++ compiler # If you passed the flag --with-cxx=foo, then it uses that # particular compiler # 2. Checks whether the compiler accepts the -g # ------------------------------------------------------------------ AC_DEFUN(LF_CONFIGURE_CXX,[ AC_PROG_CXX AC_PROG_CXXCPP LF_CXX_PORTABILITY ]) # ----------------------------------------------------------------------- # This macro tests the C++ compiler for various portability problem. # 1. Defines CXX_HAS_NO_BOOL if the compiler does not support the bool # data type # 2. Defines CXX_HAS_BUGGY_FOR_LOOPS if the compiler has buggy # scoping for the for-loop # Seperately we provide some config.h.bot code to be added to acconfig.h # that implements work-arounds for these problems. # ----------------------------------------------------------------------- dnl ACCONFIG TEMPLATE dnl #undef CXX_HAS_BUGGY_FOR_LOOPS dnl #undef CXX_HAS_NO_BOOL dnl END ACCONFIG AC_DEFUN(LF_CXX_PORTABILITY,[ AC_PROVIDE([$0]) dnl dnl Check for common C++ portability problems dnl AC_LANG_SAVE AC_LANG_CPLUSPLUS dnl Check whether we have bool AC_MSG_CHECKING(whether C++ has bool) AC_TRY_RUN([main() { bool b1=true; bool b2=false; }], [ AC_MSG_RESULT(yes) ], [ AC_MSG_RESULT(no) AC_DEFINE(CXX_HAS_NO_BOOL) ], [ AC_MSG_WARN(Don't cross-compile)] ) dnl Test whether C++ has buggy for-loops AC_MSG_CHECKING(whether C++ has correct scoping in for-loops) AC_TRY_COMPILE([#include <iostream.h>], [ for (int i=0;i<10;i++) { } for (int i=0;i<10;i++) { } ], [ AC_MSG_RESULT(yes) ], [ AC_MSG_RESULT(no) AC_DEFINE(CXX_HAS_BUGGY_FOR_LOOPS) ]) dnl Done with the portability checks AC_LANG_RESTORE ]) dnl ACCONFIG BOTTOM dnl dnl // This file defines portability work-arounds for various proprietory dnl // C++ compilers dnl dnl // Workaround for compilers with buggy for-loop scoping dnl // That's quite a few compilers actually including recent versions of dnl // Dec Alpha cxx, HP-UX CC and SGI CC. dnl // The trivial "if" statement provides the correct scoping to the dnl // for loop dnl dnl #ifdef CXX_HAS_BUGGY_FOR_LOOPS dnl #undef for dnl #define for if(1) for dnl #endif dnl dnl // dnl // If the C++ compiler we use doesn't have bool, then dnl // the following is a near-perfect work-around. dnl // You must make sure your code does not depend on "int" and "bool" dnl // being two different types, in overloading for instance. dnl // dnl dnl #ifdef CXX_HAS_NO_BOOL dnl #define bool int dnl #define true 1 dnl #define false 0 dnl #endif dnl dnl END ACCONFIG