[bpt/guile.git] / build-aux / snippet / c++defs.h

/* C++ compatible function declaration macros.
   Copyright (C) 2010-2014 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published
   by the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef _GL_CXXDEFS_H
#define _GL_CXXDEFS_H

/* The three most frequent use cases of these macros are:

   * For providing a substitute for a function that is missing on some
     platforms, but is declared and works fine on the platforms on which
     it exists:

       #if @GNULIB_FOO@
       # if !@HAVE_FOO@
       _GL_FUNCDECL_SYS (foo, ...);
       # endif
       _GL_CXXALIAS_SYS (foo, ...);
       _GL_CXXALIASWARN (foo);
       #elif defined GNULIB_POSIXCHECK
       ...
       #endif

   * For providing a replacement for a function that exists on all platforms,
     but is broken/insufficient and needs to be replaced on some platforms:

       #if @GNULIB_FOO@
       # if @REPLACE_FOO@
       #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
       #   undef foo
       #   define foo rpl_foo
       #  endif
       _GL_FUNCDECL_RPL (foo, ...);
       _GL_CXXALIAS_RPL (foo, ...);
       # else
       _GL_CXXALIAS_SYS (foo, ...);
       # endif
       _GL_CXXALIASWARN (foo);
       #elif defined GNULIB_POSIXCHECK
       ...
       #endif

   * For providing a replacement for a function that exists on some platforms
     but is broken/insufficient and needs to be replaced on some of them and
     is additionally either missing or undeclared on some other platforms:

       #if @GNULIB_FOO@
       # if @REPLACE_FOO@
       #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
       #   undef foo
       #   define foo rpl_foo
       #  endif
       _GL_FUNCDECL_RPL (foo, ...);
       _GL_CXXALIAS_RPL (foo, ...);
       # else
       #  if !@HAVE_FOO@   or   if !@HAVE_DECL_FOO@
       _GL_FUNCDECL_SYS (foo, ...);
       #  endif
       _GL_CXXALIAS_SYS (foo, ...);
       # endif
       _GL_CXXALIASWARN (foo);
       #elif defined GNULIB_POSIXCHECK
       ...
       #endif
*/

/* _GL_EXTERN_C declaration;
   performs the declaration with C linkage.  */
#if defined __cplusplus
# define _GL_EXTERN_C extern "C"
#else
# define _GL_EXTERN_C extern
#endif

/* _GL_FUNCDECL_RPL (func, rettype, parameters_and_attributes);
   declares a replacement function, named rpl_func, with the given prototype,
   consisting of return type, parameters, and attributes.
   Example:
     _GL_FUNCDECL_RPL (open, int, (const char *filename, int flags, ...)
                                  _GL_ARG_NONNULL ((1)));
 */
#define _GL_FUNCDECL_RPL(func,rettype,parameters_and_attributes) \
  _GL_FUNCDECL_RPL_1 (rpl_##func, rettype, parameters_and_attributes)
#define _GL_FUNCDECL_RPL_1(rpl_func,rettype,parameters_and_attributes) \
  _GL_EXTERN_C rettype rpl_func parameters_and_attributes

/* _GL_FUNCDECL_SYS (func, rettype, parameters_and_attributes);
   declares the system function, named func, with the given prototype,
   consisting of return type, parameters, and attributes.
   Example:
     _GL_FUNCDECL_SYS (open, int, (const char *filename, int flags, ...)
                                  _GL_ARG_NONNULL ((1)));
 */
#define _GL_FUNCDECL_SYS(func,rettype,parameters_and_attributes) \
  _GL_EXTERN_C rettype func parameters_and_attributes

/* _GL_CXXALIAS_RPL (func, rettype, parameters);
   declares a C++ alias called GNULIB_NAMESPACE::func
   that redirects to rpl_func, if GNULIB_NAMESPACE is defined.
   Example:
     _GL_CXXALIAS_RPL (open, int, (const char *filename, int flags, ...));
 */
#define _GL_CXXALIAS_RPL(func,rettype,parameters) \
  _GL_CXXALIAS_RPL_1 (func, rpl_##func, rettype, parameters)
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \
    namespace GNULIB_NAMESPACE                                \
    {                                                         \
      rettype (*const func) parameters = ::rpl_func;          \
    }                                                         \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#else
# define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIAS_RPL_CAST_1 (func, rpl_func, rettype, parameters);
   is like  _GL_CXXALIAS_RPL_1 (func, rpl_func, rettype, parameters);
   except that the C function rpl_func may have a slightly different
   declaration.  A cast is used to silence the "invalid conversion" error
   that would otherwise occur.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \
    namespace GNULIB_NAMESPACE                                     \
    {                                                              \
      rettype (*const func) parameters =                           \
        reinterpret_cast<rettype(*)parameters>(::rpl_func);        \
    }                                                              \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#else
# define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIAS_SYS (func, rettype, parameters);
   declares a C++ alias called GNULIB_NAMESPACE::func
   that redirects to the system provided function func, if GNULIB_NAMESPACE
   is defined.
   Example:
     _GL_CXXALIAS_SYS (open, int, (const char *filename, int flags, ...));
 */
#if defined __cplusplus && defined GNULIB_NAMESPACE
  /* If we were to write
       rettype (*const func) parameters = ::func;
     like above in _GL_CXXALIAS_RPL_1, the compiler could optimize calls
     better (remove an indirection through a 'static' pointer variable),
     but then the _GL_CXXALIASWARN macro below would cause a warning not only
     for uses of ::func but also for uses of GNULIB_NAMESPACE::func.  */
# define _GL_CXXALIAS_SYS(func,rettype,parameters) \
    namespace GNULIB_NAMESPACE                     \
    {                                              \
      static rettype (*func) parameters = ::func;  \
    }                                              \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#else
# define _GL_CXXALIAS_SYS(func,rettype,parameters) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIAS_SYS_CAST (func, rettype, parameters);
   is like  _GL_CXXALIAS_SYS (func, rettype, parameters);
   except that the C function func may have a slightly different declaration.
   A cast is used to silence the "invalid conversion" error that would
   otherwise occur.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \
    namespace GNULIB_NAMESPACE                          \
    {                                                   \
      static rettype (*func) parameters =               \
        reinterpret_cast<rettype(*)parameters>(::func); \
    }                                                   \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#else
# define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIAS_SYS_CAST2 (func, rettype, parameters, rettype2, parameters2);
   is like  _GL_CXXALIAS_SYS (func, rettype, parameters);
   except that the C function is picked among a set of overloaded functions,
   namely the one with rettype2 and parameters2.  Two consecutive casts
   are used to silence the "cannot find a match" and "invalid conversion"
   errors that would otherwise occur.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
  /* The outer cast must be a reinterpret_cast.
     The inner cast: When the function is defined as a set of overloaded
     functions, it works as a static_cast<>, choosing the designated variant.
     When the function is defined as a single variant, it works as a
     reinterpret_cast<>. The parenthesized cast syntax works both ways.  */
# define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \
    namespace GNULIB_NAMESPACE                                                \
    {                                                                         \
      static rettype (*func) parameters =                                     \
        reinterpret_cast<rettype(*)parameters>(                               \
          (rettype2(*)parameters2)(::func));                                  \
    }                                                                         \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#else
# define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIASWARN (func);
   causes a warning to be emitted when ::func is used but not when
   GNULIB_NAMESPACE::func is used.  func must be defined without overloaded
   variants.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_CXXALIASWARN(func) \
   _GL_CXXALIASWARN_1 (func, GNULIB_NAMESPACE)
# define _GL_CXXALIASWARN_1(func,namespace) \
   _GL_CXXALIASWARN_2 (func, namespace)
/* To work around GCC bug <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>,
   we enable the warning only when not optimizing.  */
# if !__OPTIMIZE__
#  define _GL_CXXALIASWARN_2(func,namespace) \
    _GL_WARN_ON_USE (func, \
                     "The symbol ::" #func " refers to the system function. " \
                     "Use " #namespace "::" #func " instead.")
# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
#  define _GL_CXXALIASWARN_2(func,namespace) \
     extern __typeof__ (func) func
# else
#  define _GL_CXXALIASWARN_2(func,namespace) \
     _GL_EXTERN_C int _gl_cxxalias_dummy
# endif
#else
# define _GL_CXXALIASWARN(func) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIASWARN1 (func, rettype, parameters_and_attributes);
   causes a warning to be emitted when the given overloaded variant of ::func
   is used but not when GNULIB_NAMESPACE::func is used.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \
   _GL_CXXALIASWARN1_1 (func, rettype, parameters_and_attributes, \
                        GNULIB_NAMESPACE)
# define _GL_CXXALIASWARN1_1(func,rettype,parameters_and_attributes,namespace) \
   _GL_CXXALIASWARN1_2 (func, rettype, parameters_and_attributes, namespace)
/* To work around GCC bug <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>,
   we enable the warning only when not optimizing.  */
# if !__OPTIMIZE__
#  define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
    _GL_WARN_ON_USE_CXX (func, rettype, parameters_and_attributes, \
                         "The symbol ::" #func " refers to the system function. " \
                         "Use " #namespace "::" #func " instead.")
# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
#  define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
     extern __typeof__ (func) func
# else
#  define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
     _GL_EXTERN_C int _gl_cxxalias_dummy
# endif
#else
# define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

#endif /* _GL_CXXDEFS_H */
Commit	Line	Data
f4c79b3c	1	/* C++ compatible function declaration macros.
5e69ceb7	2	Copyright (C) 2010-2014 Free Software Foundation, Inc.
f4c79b3c LC	3
	4	This program is free software: you can redistribute it and/or modify it
	5	under the terms of the GNU General Public License as published
	6	by the Free Software Foundation; either version 3 of the License, or
	7	(at your option) any later version.
	8
	9	This program is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
49114fd4	12	General Public License for more details.
f4c79b3c LC	13
	14	You should have received a copy of the GNU General Public License
	15	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	16
	17	#ifndef _GL_CXXDEFS_H
	18	#define _GL_CXXDEFS_H
	19
	20	/* The three most frequent use cases of these macros are:
	21
	22	* For providing a substitute for a function that is missing on some
	23	platforms, but is declared and works fine on the platforms on which
	24	it exists:
	25
	26	#if @GNULIB_FOO@
	27	# if !@HAVE_FOO@
	28	_GL_FUNCDECL_SYS (foo, ...);
	29	# endif
	30	_GL_CXXALIAS_SYS (foo, ...);
	31	_GL_CXXALIASWARN (foo);
	32	#elif defined GNULIB_POSIXCHECK
	33	...
	34	#endif
	35
	36	* For providing a replacement for a function that exists on all platforms,
	37	but is broken/insufficient and needs to be replaced on some platforms:
	38
	39	#if @GNULIB_FOO@
	40	# if @REPLACE_FOO@
	41	# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
	42	# undef foo
	43	# define foo rpl_foo
	44	# endif
	45	_GL_FUNCDECL_RPL (foo, ...);
	46	_GL_CXXALIAS_RPL (foo, ...);
	47	# else
	48	_GL_CXXALIAS_SYS (foo, ...);
	49	# endif
	50	_GL_CXXALIASWARN (foo);
	51	#elif defined GNULIB_POSIXCHECK
	52	...
	53	#endif
	54
	55	* For providing a replacement for a function that exists on some platforms
	56	but is broken/insufficient and needs to be replaced on some of them and
	57	is additionally either missing or undeclared on some other platforms:
	58
	59	#if @GNULIB_FOO@
	60	# if @REPLACE_FOO@
	61	# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
	62	# undef foo
	63	# define foo rpl_foo
	64	# endif
	65	_GL_FUNCDECL_RPL (foo, ...);
	66	_GL_CXXALIAS_RPL (foo, ...);
	67	# else
	68	# if !@HAVE_FOO@ or if !@HAVE_DECL_FOO@
	69	_GL_FUNCDECL_SYS (foo, ...);
	70	# endif
	71	_GL_CXXALIAS_SYS (foo, ...);
	72	# endif
	73	_GL_CXXALIASWARN (foo);
	74	#elif defined GNULIB_POSIXCHECK
	75	...
	76	#endif
77	*/
78
79	/* _GL_EXTERN_C declaration;
80	performs the declaration with C linkage. */
81	#if defined __cplusplus
82	# define _GL_EXTERN_C extern "C"
83	#else
84	# define _GL_EXTERN_C extern
85	#endif
86
87	/* _GL_FUNCDECL_RPL (func, rettype, parameters_and_attributes);
88	declares a replacement function, named rpl_func, with the given prototype,
89	consisting of return type, parameters, and attributes.
90	Example:
91	_GL_FUNCDECL_RPL (open, int, (const char *filename, int flags, ...)
92	_GL_ARG_NONNULL ((1)));
93	*/
94	#define _GL_FUNCDECL_RPL(func,rettype,parameters_and_attributes) \
95	_GL_FUNCDECL_RPL_1 (rpl_##func, rettype, parameters_and_attributes)
96	#define _GL_FUNCDECL_RPL_1(rpl_func,rettype,parameters_and_attributes) \
97	_GL_EXTERN_C rettype rpl_func parameters_and_attributes
98
99	/* _GL_FUNCDECL_SYS (func, rettype, parameters_and_attributes);
100	declares the system function, named func, with the given prototype,
101	consisting of return type, parameters, and attributes.
102	Example:
103	_GL_FUNCDECL_SYS (open, int, (const char *filename, int flags, ...)
104	_GL_ARG_NONNULL ((1)));
105	*/
106	#define _GL_FUNCDECL_SYS(func,rettype,parameters_and_attributes) \
107	_GL_EXTERN_C rettype func parameters_and_attributes
108
109	/* _GL_CXXALIAS_RPL (func, rettype, parameters);
110	declares a C++ alias called GNULIB_NAMESPACE::func
111	that redirects to rpl_func, if GNULIB_NAMESPACE is defined.
112	Example:
113	_GL_CXXALIAS_RPL (open, int, (const char *filename, int flags, ...));
114	*/
115	#define _GL_CXXALIAS_RPL(func,rettype,parameters) \
116	_GL_CXXALIAS_RPL_1 (func, rpl_##func, rettype, parameters)
117	#if defined __cplusplus && defined GNULIB_NAMESPACE
118	# define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \
119	namespace GNULIB_NAMESPACE \
120	{ \
121	rettype (*const func) parameters = ::rpl_func; \
122	} \
123	_GL_EXTERN_C int _gl_cxxalias_dummy
124	#else
125	# define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \
126	_GL_EXTERN_C int _gl_cxxalias_dummy
127	#endif
128
a927b6c1 LC	129	/* _GL_CXXALIAS_RPL_CAST_1 (func, rpl_func, rettype, parameters);
	130	is like _GL_CXXALIAS_RPL_1 (func, rpl_func, rettype, parameters);
	131	except that the C function rpl_func may have a slightly different
	132	declaration. A cast is used to silence the "invalid conversion" error
	133	that would otherwise occur. */
	134	#if defined __cplusplus && defined GNULIB_NAMESPACE
	135	# define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \
	136	namespace GNULIB_NAMESPACE \
	137	{ \
	138	rettype (*const func) parameters = \
	139	reinterpret_cast<rettype(*)parameters>(::rpl_func); \
	140	} \
	141	_GL_EXTERN_C int _gl_cxxalias_dummy
	142	#else
	143	# define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \
	144	_GL_EXTERN_C int _gl_cxxalias_dummy
	145	#endif
	146
f4c79b3c LC	147	/* _GL_CXXALIAS_SYS (func, rettype, parameters);
	148	declares a C++ alias called GNULIB_NAMESPACE::func
	149	that redirects to the system provided function func, if GNULIB_NAMESPACE
	150	is defined.
	151	Example:
	152	_GL_CXXALIAS_SYS (open, int, (const char *filename, int flags, ...));
	153	*/
	154	#if defined __cplusplus && defined GNULIB_NAMESPACE
	155	/* If we were to write
	156	rettype (*const func) parameters = ::func;
	157	like above in _GL_CXXALIAS_RPL_1, the compiler could optimize calls
	158	better (remove an indirection through a 'static' pointer variable),
	159	but then the _GL_CXXALIASWARN macro below would cause a warning not only
	160	for uses of ::func but also for uses of GNULIB_NAMESPACE::func. */
	161	# define _GL_CXXALIAS_SYS(func,rettype,parameters) \
	162	namespace GNULIB_NAMESPACE \
	163	{ \
	164	static rettype (*func) parameters = ::func; \
	165	} \
	166	_GL_EXTERN_C int _gl_cxxalias_dummy
	167	#else
	168	# define _GL_CXXALIAS_SYS(func,rettype,parameters) \
	169	_GL_EXTERN_C int _gl_cxxalias_dummy
	170	#endif
	171
	172	/* _GL_CXXALIAS_SYS_CAST (func, rettype, parameters);
	173	is like _GL_CXXALIAS_SYS (func, rettype, parameters);
	174	except that the C function func may have a slightly different declaration.
	175	A cast is used to silence the "invalid conversion" error that would
	176	otherwise occur. */
	177	#if defined __cplusplus && defined GNULIB_NAMESPACE
	178	# define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \
	179	namespace GNULIB_NAMESPACE \
	180	{ \
	181	static rettype (*func) parameters = \
	182	reinterpret_cast<rettype(*)parameters>(::func); \
	183	} \
	184	_GL_EXTERN_C int _gl_cxxalias_dummy
	185	#else
	186	# define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \
	187	_GL_EXTERN_C int _gl_cxxalias_dummy
	188	#endif
	189
	190	/* _GL_CXXALIAS_SYS_CAST2 (func, rettype, parameters, rettype2, parameters2);
	191	is like _GL_CXXALIAS_SYS (func, rettype, parameters);
	192	except that the C function is picked among a set of overloaded functions,
	193	namely the one with rettype2 and parameters2. Two consecutive casts
	194	are used to silence the "cannot find a match" and "invalid conversion"
	195	errors that would otherwise occur. */
	196	#if defined __cplusplus && defined GNULIB_NAMESPACE
	197	/* The outer cast must be a reinterpret_cast.
	198	The inner cast: When the function is defined as a set of overloaded
	199	functions, it works as a static_cast<>, choosing the designated variant.
	200	When the function is defined as a single variant, it works as a
	201	reinterpret_cast<>. The parenthesized cast syntax works both ways. */
	202	# define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \
	203	namespace GNULIB_NAMESPACE \
	204	{ \
	205	static rettype (*func) parameters = \
	206	reinterpret_cast<rettype(*)parameters>( \
	207	(rettype2(*)parameters2)(::func)); \
	208	} \
	209	_GL_EXTERN_C int _gl_cxxalias_dummy
	210	#else
211	# define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \
212	_GL_EXTERN_C int _gl_cxxalias_dummy
213	#endif
214
215	/* _GL_CXXALIASWARN (func);
216	causes a warning to be emitted when ::func is used but not when
217	GNULIB_NAMESPACE::func is used. func must be defined without overloaded
218	variants. */
219	#if defined __cplusplus && defined GNULIB_NAMESPACE
220	# define _GL_CXXALIASWARN(func) \
221	_GL_CXXALIASWARN_1 (func, GNULIB_NAMESPACE)
222	# define _GL_CXXALIASWARN_1(func,namespace) \
223	_GL_CXXALIASWARN_2 (func, namespace)
a927b6c1 LC	224	/* To work around GCC bug <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>,
	225	we enable the warning only when not optimizing. */
	226	# if !__OPTIMIZE__
	227	# define _GL_CXXALIASWARN_2(func,namespace) \
	228	_GL_WARN_ON_USE (func, \
	229	"The symbol ::" #func " refers to the system function. " \
	230	"Use " #namespace "::" #func " instead.")
	231	# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
	232	# define _GL_CXXALIASWARN_2(func,namespace) \
	233	extern __typeof__ (func) func
	234	# else
	235	# define _GL_CXXALIASWARN_2(func,namespace) \
	236	_GL_EXTERN_C int _gl_cxxalias_dummy
	237	# endif
f4c79b3c LC	238	#else
	239	# define _GL_CXXALIASWARN(func) \
	240	_GL_EXTERN_C int _gl_cxxalias_dummy
	241	#endif
	242
	243	/* _GL_CXXALIASWARN1 (func, rettype, parameters_and_attributes);
	244	causes a warning to be emitted when the given overloaded variant of ::func
	245	is used but not when GNULIB_NAMESPACE::func is used. */
	246	#if defined __cplusplus && defined GNULIB_NAMESPACE
	247	# define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \
	248	_GL_CXXALIASWARN1_1 (func, rettype, parameters_and_attributes, \
	249	GNULIB_NAMESPACE)
	250	# define _GL_CXXALIASWARN1_1(func,rettype,parameters_and_attributes,namespace) \
	251	_GL_CXXALIASWARN1_2 (func, rettype, parameters_and_attributes, namespace)
a927b6c1 LC	252	/* To work around GCC bug <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>,
	253	we enable the warning only when not optimizing. */
	254	# if !__OPTIMIZE__
	255	# define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
	256	_GL_WARN_ON_USE_CXX (func, rettype, parameters_and_attributes, \
	257	"The symbol ::" #func " refers to the system function. " \
	258	"Use " #namespace "::" #func " instead.")
	259	# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
	260	# define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
	261	extern __typeof__ (func) func
	262	# else
	263	# define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
	264	_GL_EXTERN_C int _gl_cxxalias_dummy
	265	# endif
f4c79b3c LC	266	#else
	267	# define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \
	268	_GL_EXTERN_C int _gl_cxxalias_dummy
	269	#endif
	270
	271	#endif /* _GL_CXXDEFS_H */