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-rw-r--r--lib/c++defs.h255
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diff --git a/lib/c++defs.h b/lib/c++defs.h
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-#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 */
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