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Fix G_STMT_START / G_STMT_END on Solaris. (#321972, Andrew Paprocki)

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2005-11-28  Matthias Clasen  <mclasen@redhat.com>

        Fix G_STMT_START / G_STMT_END on Solaris.  (#321972,
        Andrew Paprocki)

        * configure.in: Check whether do { } while (0) works.

        * glib/gmacros.h: Use do { } while (0) for G_STMT_START /
        G_STMT_END if it works.
This commit is contained in:
Matthias Clasen 2005-11-30 04:54:57 +00:00 committed by Matthias Clasen
parent d98433b85e
commit 6796398522
5 changed files with 63 additions and 15 deletions
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10
ChangeLog
View File

@ -1,3 +1,13 @@
2005-11-28 Matthias Clasen <mclasen@redhat.com>
Fix G_STMT_START / G_STMT_END on Solaris. (#321972,
Andrew Paprocki)
* configure.in: Check whether do { } while (0) works.
* glib/gmacros.h: Use do { } while (0) for G_STMT_START /
G_STMT_END if it works.
2005-11-28 Matthias Clasen <mclasen@redhat.com>
* glib/gthread.c (g_static_rw_lock_wait, g_static_rw_lock_signal):

10
ChangeLog.pre-2-10
View File

@ -1,3 +1,13 @@
2005-11-28 Matthias Clasen <mclasen@redhat.com>
Fix G_STMT_START / G_STMT_END on Solaris. (#321972,
Andrew Paprocki)
* configure.in: Check whether do { } while (0) works.
* glib/gmacros.h: Use do { } while (0) for G_STMT_START /
G_STMT_END if it works.
2005-11-28 Matthias Clasen <mclasen@redhat.com>
* glib/gthread.c (g_static_rw_lock_wait, g_static_rw_lock_signal):

10
ChangeLog.pre-2-12
View File

@ -1,3 +1,13 @@
2005-11-28 Matthias Clasen <mclasen@redhat.com>
Fix G_STMT_START / G_STMT_END on Solaris. (#321972,
Andrew Paprocki)
* configure.in: Check whether do { } while (0) works.
* glib/gmacros.h: Use do { } while (0) for G_STMT_START /
G_STMT_END if it works.
2005-11-28 Matthias Clasen <mclasen@redhat.com>
* glib/gthread.c (g_static_rw_lock_wait, g_static_rw_lock_signal):

15
configure.in
View File

@ -700,6 +700,21 @@ main (void) {
}],[g_can_inline=yes],[g_can_inline=no])
AC_MSG_RESULT($g_can_inline)
dnl *** check for working do while(0) macros ***
AC_CACHE_CHECK([for working do while(0) macros], g_support_dowhile_macros, [
AC_TRY_COMPILE([],[
#define STMT_START do
#define STMT_END while(0)
#define STMT_TEST STMT_START { i = 0; } STMT_END
int main(void) { int i = 1; STMT_TEST; return i; }],
[g_support_dowhile_macros=yes],
[g_support_dowhile_macros=no],
[g_support_dowhile_macros=yes])
])
if test x$g_support_dowhile_macros = xyes; then
AC_DEFINE(HAVE_DOWHILE_MACROS, 1, [define for working do while(0) macros])
fi
# check for flavours of varargs macros
AC_MSG_CHECKING(for ISO C99 varargs macros in C)
AC_TRY_COMPILE([],[

23
glib/gmacros.h
View File

@ -194,23 +194,26 @@
* can be used as a single statement, as in
* if (x) G_STMT_START { ... } G_STMT_END; else ...
*
* For gcc we will wrap the statements within `({' and `})' braces.
* For SunOS they will be wrapped within `if (1)' and `else (void) 0',
* and otherwise within `do' and `while (0)'.
* 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'.
*/
#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
# if (defined (sun) || defined (__sun__))
# define G_STMT_START if (1)
# define G_STMT_END else (void)0
# else
# else /* !(__GNUC__ && !__STRICT_ANSI__ && !__cplusplus) */
# if defined (HAVE_DOWHILE_MACROS)
# define G_STMT_START do
# define G_STMT_END while (0)
# endif
# endif
# 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) */
#endif
/* Allow the app programmer to select whether or not return values