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AC_DEFUN([DOVECOT_VA_COPY], [
AC_CACHE_CHECK([for an implementation of va_copy()],lib_cv_va_copy,[
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdarg.h>
#include <stdlib.h>
void f (int i, ...) {
va_list args1, args2;
va_start (args1, i);
va_copy (args2, args1);
if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
exit (1);
va_end (args1); va_end (args2);
}
]], [[
f (0, 42);
return 0;
]])],
[lib_cv_va_copy=yes],
[lib_cv_va_copy=no],[])
])
AC_CACHE_CHECK([for an implementation of __va_copy()],lib_cv___va_copy,[
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdarg.h>
#include <stdlib.h>
void f (int i, ...) {
va_list args1, args2;
va_start (args1, i);
__va_copy (args2, args1);
if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
exit (1);
va_end (args1); va_end (args2);
}
]], [[
f (0, 42);
return 0;
]])],
[lib_cv___va_copy=yes],
[lib_cv___va_copy=no],[])
])
AS_IF([test "$lib_cv_va_copy" = "yes"], [
va_copy_func=va_copy
], [test "$lib_cv___va_copy" = "yes"], [
va_copy_func=__va_copy
])
AS_IF([test -n "$va_copy_func"], [
AC_DEFINE_UNQUOTED(VA_COPY,$va_copy_func,[A 'va_copy' style function])
])
])
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