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implement G_STMT_START and G_STMT_END with do{}while(0), which is believed

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2008-05-22 10:49:37  Tim Janik  <timj@imendio.com>

        * glib/gmacros.h: implement G_STMT_START and G_STMT_END with
        do{}while(0), which is believed to be widely portable, fixes:
        Bug 519026 - G_STMT_START/G_STMT_END test a non-existent preprocessor symbol



svn path=/trunk/; revision=6922
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10:49:37 Tim Janik 2008-05-22 08:53:15 +00:00 committed by Tim Janik
parent 64e1b6d84f
commit 0782d697e5
2 changed files with 14 additions and 23 deletions
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ChangeLog
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@ -1,3 +1,9 @@
2008-05-22 10:49:37 Tim Janik <timj@imendio.com>
* glib/gmacros.h: implement G_STMT_START and G_STMT_END with
do{}while(0), which is believed to be widely portable, fixes:
Bug 519026 - G_STMT_START/G_STMT_END test a non-existent preprocessor symbol
2008-05-20 Behdad Esfahbod <behdad@gnome.org>
Bug 501651 – Update glib/libcharset

31
glib/gmacros.h
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@ -216,31 +216,16 @@
#define G_STRUCT_MEMBER(member_type, struct_p, struct_offset) \
(*(member_type*) G_STRUCT_MEMBER_P ((struct_p), (struct_offset)))
/* Provide simple macro statement wrappers (adapted from Perl):
* G_STMT_START { statements; } G_STMT_END;
* can be used as a single statement, as in
* if (x) G_STMT_START { ... } G_STMT_END; else ...
*
* When GCC is compiling C code in non-ANSI mode, it will use the
* compiler __extension__ to wrap the statements wihin `({' and '})' braces.
* When compiling on platforms where configure has defined
* HAVE_DOWHILE_MACROS, statements will be wrapped with `do' and `while (0)'.
* For any other platforms (SunOS4 is known to have this issue), wrap the
* statements with `if (1)' and `else (void) 0'.
/* Provide simple macro statement wrappers:
* G_STMT_START { statements; } G_STMT_END;
* This can be used as a single statement, like:
* if (x) G_STMT_START { ... } G_STMT_END; else ...
* This intentionally does not use compiler extensions like GCC's '({...})' to
* avoid portability issue or side effects when compiled with different compilers.
*/
#if !(defined (G_STMT_START) && defined (G_STMT_END))
# if defined (__GNUC__) && !defined (__STRICT_ANSI__) && !defined (__cplusplus)
# define G_STMT_START (void) __extension__ (
# define G_STMT_END )
# else /* !(__GNUC__ && !__STRICT_ANSI__ && !__cplusplus) */
# if defined (HAVE_DOWHILE_MACROS)
# define G_STMT_START do
# define G_STMT_END while (0)
# else /* !HAVE_DOWHILE_MACROS */
# define G_STMT_START if (1)
# define G_STMT_END else (void) 0
# endif /* !HAVE_DOWHILE_MACROS */
# endif /* !(__GNUC__ && !__STRICT_ANSI__ && !__cplusplus) */
# define G_STMT_START do
# define G_STMT_END while (0)
#endif
/* Allow the app programmer to select whether or not return values