105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* C++ compatible function declaration macros. 205436638acc7c010349a69c3395f1a57c642dc62Ying Wang Copyright (C) 2010-2012 Free Software Foundation, Inc. 305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 405436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is free software: you can redistribute it and/or modify it 505436638acc7c010349a69c3395f1a57c642dc62Ying Wang under the terms of the GNU General Public License as published 605436638acc7c010349a69c3395f1a57c642dc62Ying Wang by the Free Software Foundation; either version 3 of the License, or 705436638acc7c010349a69c3395f1a57c642dc62Ying Wang (at your option) any later version. 805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 905436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is distributed in the hope that it will be useful, 1005436638acc7c010349a69c3395f1a57c642dc62Ying Wang but WITHOUT ANY WARRANTY; without even the implied warranty of 1105436638acc7c010349a69c3395f1a57c642dc62Ying Wang MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1205436638acc7c010349a69c3395f1a57c642dc62Ying Wang General Public License for more details. 1305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1405436638acc7c010349a69c3395f1a57c642dc62Ying Wang You should have received a copy of the GNU General Public License 1505436638acc7c010349a69c3395f1a57c642dc62Ying Wang along with this program. If not, see <http://www.gnu.org/licenses/>. */ 1605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1705436638acc7c010349a69c3395f1a57c642dc62Ying Wang#ifndef _GL_CXXDEFS_H 1805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#define _GL_CXXDEFS_H 1905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2005436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* The three most frequent use cases of these macros are: 2105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2205436638acc7c010349a69c3395f1a57c642dc62Ying Wang * For providing a substitute for a function that is missing on some 2305436638acc7c010349a69c3395f1a57c642dc62Ying Wang platforms, but is declared and works fine on the platforms on which 2405436638acc7c010349a69c3395f1a57c642dc62Ying Wang it exists: 2505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2605436638acc7c010349a69c3395f1a57c642dc62Ying Wang #if @GNULIB_FOO@ 2705436638acc7c010349a69c3395f1a57c642dc62Ying Wang # if !@HAVE_FOO@ 2805436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_FUNCDECL_SYS (foo, ...); 2905436638acc7c010349a69c3395f1a57c642dc62Ying Wang # endif 3005436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIAS_SYS (foo, ...); 3105436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIASWARN (foo); 3205436638acc7c010349a69c3395f1a57c642dc62Ying Wang #elif defined GNULIB_POSIXCHECK 3305436638acc7c010349a69c3395f1a57c642dc62Ying Wang ... 3405436638acc7c010349a69c3395f1a57c642dc62Ying Wang #endif 3505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3605436638acc7c010349a69c3395f1a57c642dc62Ying Wang * For providing a replacement for a function that exists on all platforms, 3705436638acc7c010349a69c3395f1a57c642dc62Ying Wang but is broken/insufficient and needs to be replaced on some platforms: 3805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3905436638acc7c010349a69c3395f1a57c642dc62Ying Wang #if @GNULIB_FOO@ 4005436638acc7c010349a69c3395f1a57c642dc62Ying Wang # if @REPLACE_FOO@ 4105436638acc7c010349a69c3395f1a57c642dc62Ying Wang # if !(defined __cplusplus && defined GNULIB_NAMESPACE) 4205436638acc7c010349a69c3395f1a57c642dc62Ying Wang # undef foo 4305436638acc7c010349a69c3395f1a57c642dc62Ying Wang # define foo rpl_foo 4405436638acc7c010349a69c3395f1a57c642dc62Ying Wang # endif 4505436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_FUNCDECL_RPL (foo, ...); 4605436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIAS_RPL (foo, ...); 4705436638acc7c010349a69c3395f1a57c642dc62Ying Wang # else 4805436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIAS_SYS (foo, ...); 4905436638acc7c010349a69c3395f1a57c642dc62Ying Wang # endif 5005436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIASWARN (foo); 5105436638acc7c010349a69c3395f1a57c642dc62Ying Wang #elif defined GNULIB_POSIXCHECK 5205436638acc7c010349a69c3395f1a57c642dc62Ying Wang ... 5305436638acc7c010349a69c3395f1a57c642dc62Ying Wang #endif 5405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5505436638acc7c010349a69c3395f1a57c642dc62Ying Wang * For providing a replacement for a function that exists on some platforms 5605436638acc7c010349a69c3395f1a57c642dc62Ying Wang but is broken/insufficient and needs to be replaced on some of them and 5705436638acc7c010349a69c3395f1a57c642dc62Ying Wang is additionally either missing or undeclared on some other platforms: 5805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5905436638acc7c010349a69c3395f1a57c642dc62Ying Wang #if @GNULIB_FOO@ 6005436638acc7c010349a69c3395f1a57c642dc62Ying Wang # if @REPLACE_FOO@ 6105436638acc7c010349a69c3395f1a57c642dc62Ying Wang # if !(defined __cplusplus && defined GNULIB_NAMESPACE) 6205436638acc7c010349a69c3395f1a57c642dc62Ying Wang # undef foo 6305436638acc7c010349a69c3395f1a57c642dc62Ying Wang # define foo rpl_foo 6405436638acc7c010349a69c3395f1a57c642dc62Ying Wang # endif 6505436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_FUNCDECL_RPL (foo, ...); 6605436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIAS_RPL (foo, ...); 6705436638acc7c010349a69c3395f1a57c642dc62Ying Wang # else 6805436638acc7c010349a69c3395f1a57c642dc62Ying Wang # if !@HAVE_FOO@ or if !@HAVE_DECL_FOO@ 6905436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_FUNCDECL_SYS (foo, ...); 7005436638acc7c010349a69c3395f1a57c642dc62Ying Wang # endif 7105436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIAS_SYS (foo, ...); 7205436638acc7c010349a69c3395f1a57c642dc62Ying Wang # endif 7305436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIASWARN (foo); 7405436638acc7c010349a69c3395f1a57c642dc62Ying Wang #elif defined GNULIB_POSIXCHECK 7505436638acc7c010349a69c3395f1a57c642dc62Ying Wang ... 7605436638acc7c010349a69c3395f1a57c642dc62Ying Wang #endif 7705436638acc7c010349a69c3395f1a57c642dc62Ying Wang*/ 7805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 7905436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* _GL_EXTERN_C declaration; 8005436638acc7c010349a69c3395f1a57c642dc62Ying Wang performs the declaration with C linkage. */ 8105436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if defined __cplusplus 8205436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_EXTERN_C extern "C" 8305436638acc7c010349a69c3395f1a57c642dc62Ying Wang#else 8405436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_EXTERN_C extern 8505436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 8605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 8705436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* _GL_FUNCDECL_RPL (func, rettype, parameters_and_attributes); 8805436638acc7c010349a69c3395f1a57c642dc62Ying Wang declares a replacement function, named rpl_func, with the given prototype, 8905436638acc7c010349a69c3395f1a57c642dc62Ying Wang consisting of return type, parameters, and attributes. 9005436638acc7c010349a69c3395f1a57c642dc62Ying Wang Example: 9105436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_FUNCDECL_RPL (open, int, (const char *filename, int flags, ...) 9205436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_ARG_NONNULL ((1))); 9305436638acc7c010349a69c3395f1a57c642dc62Ying Wang */ 9405436638acc7c010349a69c3395f1a57c642dc62Ying Wang#define _GL_FUNCDECL_RPL(func,rettype,parameters_and_attributes) \ 9505436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_FUNCDECL_RPL_1 (rpl_##func, rettype, parameters_and_attributes) 9605436638acc7c010349a69c3395f1a57c642dc62Ying Wang#define _GL_FUNCDECL_RPL_1(rpl_func,rettype,parameters_and_attributes) \ 9705436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C rettype rpl_func parameters_and_attributes 9805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 9905436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* _GL_FUNCDECL_SYS (func, rettype, parameters_and_attributes); 10005436638acc7c010349a69c3395f1a57c642dc62Ying Wang declares the system function, named func, with the given prototype, 10105436638acc7c010349a69c3395f1a57c642dc62Ying Wang consisting of return type, parameters, and attributes. 10205436638acc7c010349a69c3395f1a57c642dc62Ying Wang Example: 10305436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_FUNCDECL_SYS (open, int, (const char *filename, int flags, ...) 10405436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_ARG_NONNULL ((1))); 10505436638acc7c010349a69c3395f1a57c642dc62Ying Wang */ 10605436638acc7c010349a69c3395f1a57c642dc62Ying Wang#define _GL_FUNCDECL_SYS(func,rettype,parameters_and_attributes) \ 10705436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C rettype func parameters_and_attributes 10805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 10905436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* _GL_CXXALIAS_RPL (func, rettype, parameters); 11005436638acc7c010349a69c3395f1a57c642dc62Ying Wang declares a C++ alias called GNULIB_NAMESPACE::func 11105436638acc7c010349a69c3395f1a57c642dc62Ying Wang that redirects to rpl_func, if GNULIB_NAMESPACE is defined. 11205436638acc7c010349a69c3395f1a57c642dc62Ying Wang Example: 11305436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIAS_RPL (open, int, (const char *filename, int flags, ...)); 11405436638acc7c010349a69c3395f1a57c642dc62Ying Wang */ 11505436638acc7c010349a69c3395f1a57c642dc62Ying Wang#define _GL_CXXALIAS_RPL(func,rettype,parameters) \ 11605436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIAS_RPL_1 (func, rpl_##func, rettype, parameters) 11705436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if defined __cplusplus && defined GNULIB_NAMESPACE 11805436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \ 11905436638acc7c010349a69c3395f1a57c642dc62Ying Wang namespace GNULIB_NAMESPACE \ 12005436638acc7c010349a69c3395f1a57c642dc62Ying Wang { \ 12105436638acc7c010349a69c3395f1a57c642dc62Ying Wang rettype (*const func) parameters = ::rpl_func; \ 12205436638acc7c010349a69c3395f1a57c642dc62Ying Wang } \ 12305436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 12405436638acc7c010349a69c3395f1a57c642dc62Ying Wang#else 12505436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \ 12605436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 12705436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 12805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 12905436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* _GL_CXXALIAS_RPL_CAST_1 (func, rpl_func, rettype, parameters); 13005436638acc7c010349a69c3395f1a57c642dc62Ying Wang is like _GL_CXXALIAS_RPL_1 (func, rpl_func, rettype, parameters); 13105436638acc7c010349a69c3395f1a57c642dc62Ying Wang except that the C function rpl_func may have a slightly different 13205436638acc7c010349a69c3395f1a57c642dc62Ying Wang declaration. A cast is used to silence the "invalid conversion" error 13305436638acc7c010349a69c3395f1a57c642dc62Ying Wang that would otherwise occur. */ 13405436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if defined __cplusplus && defined GNULIB_NAMESPACE 13505436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \ 13605436638acc7c010349a69c3395f1a57c642dc62Ying Wang namespace GNULIB_NAMESPACE \ 13705436638acc7c010349a69c3395f1a57c642dc62Ying Wang { \ 13805436638acc7c010349a69c3395f1a57c642dc62Ying Wang rettype (*const func) parameters = \ 13905436638acc7c010349a69c3395f1a57c642dc62Ying Wang reinterpret_cast<rettype(*)parameters>(::rpl_func); \ 14005436638acc7c010349a69c3395f1a57c642dc62Ying Wang } \ 14105436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 14205436638acc7c010349a69c3395f1a57c642dc62Ying Wang#else 14305436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \ 14405436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 14505436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 14605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 14705436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* _GL_CXXALIAS_SYS (func, rettype, parameters); 14805436638acc7c010349a69c3395f1a57c642dc62Ying Wang declares a C++ alias called GNULIB_NAMESPACE::func 14905436638acc7c010349a69c3395f1a57c642dc62Ying Wang that redirects to the system provided function func, if GNULIB_NAMESPACE 15005436638acc7c010349a69c3395f1a57c642dc62Ying Wang is defined. 15105436638acc7c010349a69c3395f1a57c642dc62Ying Wang Example: 15205436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIAS_SYS (open, int, (const char *filename, int flags, ...)); 15305436638acc7c010349a69c3395f1a57c642dc62Ying Wang */ 15405436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if defined __cplusplus && defined GNULIB_NAMESPACE 15505436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* If we were to write 15605436638acc7c010349a69c3395f1a57c642dc62Ying Wang rettype (*const func) parameters = ::func; 15705436638acc7c010349a69c3395f1a57c642dc62Ying Wang like above in _GL_CXXALIAS_RPL_1, the compiler could optimize calls 15805436638acc7c010349a69c3395f1a57c642dc62Ying Wang better (remove an indirection through a 'static' pointer variable), 15905436638acc7c010349a69c3395f1a57c642dc62Ying Wang but then the _GL_CXXALIASWARN macro below would cause a warning not only 16005436638acc7c010349a69c3395f1a57c642dc62Ying Wang for uses of ::func but also for uses of GNULIB_NAMESPACE::func. */ 16105436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIAS_SYS(func,rettype,parameters) \ 16205436638acc7c010349a69c3395f1a57c642dc62Ying Wang namespace GNULIB_NAMESPACE \ 16305436638acc7c010349a69c3395f1a57c642dc62Ying Wang { \ 16405436638acc7c010349a69c3395f1a57c642dc62Ying Wang static rettype (*func) parameters = ::func; \ 16505436638acc7c010349a69c3395f1a57c642dc62Ying Wang } \ 16605436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 16705436638acc7c010349a69c3395f1a57c642dc62Ying Wang#else 16805436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIAS_SYS(func,rettype,parameters) \ 16905436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 17005436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 17105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 17205436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* _GL_CXXALIAS_SYS_CAST (func, rettype, parameters); 17305436638acc7c010349a69c3395f1a57c642dc62Ying Wang is like _GL_CXXALIAS_SYS (func, rettype, parameters); 17405436638acc7c010349a69c3395f1a57c642dc62Ying Wang except that the C function func may have a slightly different declaration. 17505436638acc7c010349a69c3395f1a57c642dc62Ying Wang A cast is used to silence the "invalid conversion" error that would 17605436638acc7c010349a69c3395f1a57c642dc62Ying Wang otherwise occur. */ 17705436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if defined __cplusplus && defined GNULIB_NAMESPACE 17805436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \ 17905436638acc7c010349a69c3395f1a57c642dc62Ying Wang namespace GNULIB_NAMESPACE \ 18005436638acc7c010349a69c3395f1a57c642dc62Ying Wang { \ 18105436638acc7c010349a69c3395f1a57c642dc62Ying Wang static rettype (*func) parameters = \ 18205436638acc7c010349a69c3395f1a57c642dc62Ying Wang reinterpret_cast<rettype(*)parameters>(::func); \ 18305436638acc7c010349a69c3395f1a57c642dc62Ying Wang } \ 18405436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 18505436638acc7c010349a69c3395f1a57c642dc62Ying Wang#else 18605436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \ 18705436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 18805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 18905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 19005436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* _GL_CXXALIAS_SYS_CAST2 (func, rettype, parameters, rettype2, parameters2); 19105436638acc7c010349a69c3395f1a57c642dc62Ying Wang is like _GL_CXXALIAS_SYS (func, rettype, parameters); 19205436638acc7c010349a69c3395f1a57c642dc62Ying Wang except that the C function is picked among a set of overloaded functions, 19305436638acc7c010349a69c3395f1a57c642dc62Ying Wang namely the one with rettype2 and parameters2. Two consecutive casts 19405436638acc7c010349a69c3395f1a57c642dc62Ying Wang are used to silence the "cannot find a match" and "invalid conversion" 19505436638acc7c010349a69c3395f1a57c642dc62Ying Wang errors that would otherwise occur. */ 19605436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if defined __cplusplus && defined GNULIB_NAMESPACE 19705436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* The outer cast must be a reinterpret_cast. 19805436638acc7c010349a69c3395f1a57c642dc62Ying Wang The inner cast: When the function is defined as a set of overloaded 19905436638acc7c010349a69c3395f1a57c642dc62Ying Wang functions, it works as a static_cast<>, choosing the designated variant. 20005436638acc7c010349a69c3395f1a57c642dc62Ying Wang When the function is defined as a single variant, it works as a 20105436638acc7c010349a69c3395f1a57c642dc62Ying Wang reinterpret_cast<>. The parenthesized cast syntax works both ways. */ 20205436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \ 20305436638acc7c010349a69c3395f1a57c642dc62Ying Wang namespace GNULIB_NAMESPACE \ 20405436638acc7c010349a69c3395f1a57c642dc62Ying Wang { \ 20505436638acc7c010349a69c3395f1a57c642dc62Ying Wang static rettype (*func) parameters = \ 20605436638acc7c010349a69c3395f1a57c642dc62Ying Wang reinterpret_cast<rettype(*)parameters>( \ 20705436638acc7c010349a69c3395f1a57c642dc62Ying Wang (rettype2(*)parameters2)(::func)); \ 20805436638acc7c010349a69c3395f1a57c642dc62Ying Wang } \ 20905436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 21005436638acc7c010349a69c3395f1a57c642dc62Ying Wang#else 21105436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \ 21205436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 21305436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 21405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 21505436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* _GL_CXXALIASWARN (func); 21605436638acc7c010349a69c3395f1a57c642dc62Ying Wang causes a warning to be emitted when ::func is used but not when 21705436638acc7c010349a69c3395f1a57c642dc62Ying Wang GNULIB_NAMESPACE::func is used. func must be defined without overloaded 21805436638acc7c010349a69c3395f1a57c642dc62Ying Wang variants. */ 21905436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if defined __cplusplus && defined GNULIB_NAMESPACE 22005436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN(func) \ 22105436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIASWARN_1 (func, GNULIB_NAMESPACE) 22205436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN_1(func,namespace) \ 22305436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIASWARN_2 (func, namespace) 22405436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* To work around GCC bug <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>, 22505436638acc7c010349a69c3395f1a57c642dc62Ying Wang we enable the warning only when not optimizing. */ 22605436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if !__OPTIMIZE__ 22705436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN_2(func,namespace) \ 22805436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_WARN_ON_USE (func, \ 22905436638acc7c010349a69c3395f1a57c642dc62Ying Wang "The symbol ::" #func " refers to the system function. " \ 23005436638acc7c010349a69c3395f1a57c642dc62Ying Wang "Use " #namespace "::" #func " instead.") 23105436638acc7c010349a69c3395f1a57c642dc62Ying Wang# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING 23205436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN_2(func,namespace) \ 23305436638acc7c010349a69c3395f1a57c642dc62Ying Wang extern __typeof__ (func) func 23405436638acc7c010349a69c3395f1a57c642dc62Ying Wang# else 23505436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN_2(func,namespace) \ 23605436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 23705436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 23805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#else 23905436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN(func) \ 24005436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 24105436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 24205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 24305436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* _GL_CXXALIASWARN1 (func, rettype, parameters_and_attributes); 24405436638acc7c010349a69c3395f1a57c642dc62Ying Wang causes a warning to be emitted when the given overloaded variant of ::func 24505436638acc7c010349a69c3395f1a57c642dc62Ying Wang is used but not when GNULIB_NAMESPACE::func is used. */ 24605436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if defined __cplusplus && defined GNULIB_NAMESPACE 24705436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \ 24805436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIASWARN1_1 (func, rettype, parameters_and_attributes, \ 24905436638acc7c010349a69c3395f1a57c642dc62Ying Wang GNULIB_NAMESPACE) 25005436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN1_1(func,rettype,parameters_and_attributes,namespace) \ 25105436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_CXXALIASWARN1_2 (func, rettype, parameters_and_attributes, namespace) 25205436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* To work around GCC bug <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>, 25305436638acc7c010349a69c3395f1a57c642dc62Ying Wang we enable the warning only when not optimizing. */ 25405436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if !__OPTIMIZE__ 25505436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \ 25605436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_WARN_ON_USE_CXX (func, rettype, parameters_and_attributes, \ 25705436638acc7c010349a69c3395f1a57c642dc62Ying Wang "The symbol ::" #func " refers to the system function. " \ 25805436638acc7c010349a69c3395f1a57c642dc62Ying Wang "Use " #namespace "::" #func " instead.") 25905436638acc7c010349a69c3395f1a57c642dc62Ying Wang# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING 26005436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \ 26105436638acc7c010349a69c3395f1a57c642dc62Ying Wang extern __typeof__ (func) func 26205436638acc7c010349a69c3395f1a57c642dc62Ying Wang# else 26305436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \ 26405436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 26505436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 26605436638acc7c010349a69c3395f1a57c642dc62Ying Wang#else 26705436638acc7c010349a69c3395f1a57c642dc62Ying Wang# define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \ 26805436638acc7c010349a69c3395f1a57c642dc62Ying Wang _GL_EXTERN_C int _gl_cxxalias_dummy 26905436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 27005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 27105436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif /* _GL_CXXDEFS_H */ 272