Re: [RFA] Handle cygwin wchar_t specifics

[Jan Kratochvil <jan.kratochvil@redhat.com>]

On Sat, 16 Apr 2011 18:05:19 +0200, Pierre Muller wrote:
>   Do you know of any way to get the size of wchar_t?
>   I suspect we will need to add this to the configure scripts...
> But I am still very bad on that part.

I do not follow the platform specifics of the problem but this specific
technical task is attached.  On GNU/Linux I get in config.h:

/* The size of `wchar_t', as computed by sizeof. */
#define SIZEOF_WCHAR_T 4

info '(autoconf)AC_CHECK_SIZEOF'
Fro cross-compilation the default is 4, for some unknown error it is 0.


HTH,
Jan


--- a/gdb/config.in
+++ b/gdb/config.in
@@ -804,6 +804,9 @@
 /* The size of `long', as computed by sizeof. */
 #undef SIZEOF_LONG
 
+/* The size of `wchar_t', as computed by sizeof. */
+#undef SIZEOF_WCHAR_T
+
 /* Define to l, ll, u, ul, ull, etc., as suitable for constants of type
    'size_t'. */
 #undef SIZE_T_SUFFIX
--- a/gdb/configure
+++ b/gdb/configure
@@ -11637,6 +11637,44 @@ _ACEOF
 
 fi
 
+# The cast to long int works around a bug in the HP C Compiler
+# version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
+# declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'.
+# This bug is HP SR number 8606223364.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking size of wchar_t" >&5
+$as_echo_n "checking size of wchar_t... " >&6; }
+if test "${ac_cv_sizeof_wchar_t+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (wchar_t))" "ac_cv_sizeof_wchar_t"        "
+#include <wchar.h>
+#include <wctype.h>
+
+"; then :
+
+else
+  if test "$ac_cv_type_wchar_t" = yes; then
+     { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+{ as_fn_set_status 77
+as_fn_error "cannot compute sizeof (wchar_t)
+See \`config.log' for more details." "$LINENO" 5; }; }
+   else
+     ac_cv_sizeof_wchar_t=0
+   fi
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_sizeof_wchar_t" >&5
+$as_echo "$ac_cv_sizeof_wchar_t" >&6; }
+
+
+
+cat >>confdefs.h <<_ACEOF
+#define SIZEOF_WCHAR_T $ac_cv_sizeof_wchar_t
+_ACEOF
+
+
 
 # ------------------------------------- #
 # Checks for compiler characteristics.  #
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -976,6 +976,10 @@ AC_CHECK_TYPES(socklen_t, [], [],
 [#include <sys/types.h>
 #include <sys/socket.h>
 ])
+AC_CHECK_SIZEOF([wchar_t], 4, [
+#include <wchar.h>
+#include <wctype.h>
+])
 
 # ------------------------------------- #
 # Checks for compiler characteristics.  #