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glib: Always implement G_VA_COPY as va_copy()

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C99 guarantees that va_copy() exists, so use it, instead of probing
for __va_copy(), va_copy(), or a reimplementation from first principles.

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2022-10-21 14:48:26 +01:00
parent fe7eb71c43
commit b8f37a543c
3 changed files with 5 additions and 44 deletions
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1
glib/glibconfig.h.in
View File

@ -118,6 +118,7 @@ typedef unsigned @glib_intptr_type_define@ guintptr;
@glib_os@
#define G_VA_COPY va_copy
@glib_vacopy@
#define G_HAVE_ISO_VARARGS 1

13
glib/gutils.h
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@ -36,19 +36,6 @@
G_BEGIN_DECLS
/* Define G_VA_COPY() to do the right thing for copying va_list variables.
* glibconfig.h may have already defined G_VA_COPY as va_copy or __va_copy.
*/
#if !defined (G_VA_COPY)
# if defined (__GNUC__) && defined (__PPC__) && (defined (_CALL_SYSV) || defined (_WIN32))
# define G_VA_COPY(ap1, ap2) (*(ap1) = *(ap2))
# elif defined (G_VA_COPY_AS_ARRAY)
# define G_VA_COPY(ap1, ap2) memmove ((ap1), (ap2), sizeof (va_list))
# else /* va_list is a pointer */
# define G_VA_COPY(ap1, ap2) ((ap1) = (ap2))
# endif /* va_list is a pointer */
#endif /* !G_VA_COPY */
GLIB_AVAILABLE_IN_ALL
const gchar * g_get_user_name (void);
GLIB_AVAILABLE_IN_ALL

35
meson.build
View File

@ -1646,38 +1646,11 @@ else
endif
# === va_copy checks ===
# we currently check for all three va_copy possibilities, so we get
# all results in config.log for bug reports.
va_copy_func = ''
foreach try_func : [ '__va_copy', 'va_copy' ]
if cc.compiles('''#include <stdarg.h>
#include <stdlib.h>
#ifdef _MSC_VER
# include "msvc_recommended_pragmas.h"
#endif
void f (int i, ...) {
va_list args1, args2;
va_start (args1, i);
@0@ (args2, args1);
if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
exit (1);
va_end (args1); va_end (args2);
}
int main() {
f (0, 42);
return 0;
}'''.format(try_func),
name : try_func + ' check')
va_copy_func = try_func
endif
endforeach
if va_copy_func != ''
glib_conf.set('G_VA_COPY', va_copy_func)
glib_vacopy = '#define G_VA_COPY ' + va_copy_func
else
glib_vacopy = '/* #undef G_VA_COPY */'
endif
glib_vacopy = ''
# We check for G_VA_COPY_AS_ARRAY for historical reasons, but we no longer
# use it: use Standard C va_copy() instead.
va_list_val_copy_prog = '''
#include <stdarg.h>