c-common.c (builtin_define_type_precision): New function.

gcc/
 2002-08-28  Gabriel Dos Reis  <gdr@integrable-solutions.net>

 * c-common.c (builtin_define_type_precision): New function.
 (cb_register_builtins): Use it.  Define __WCHAR_UNSIGNED__ is
 wchar_t is unsigned in C++.
 * doc/cpp.texi (Common Predefined Macros): Document
 __WCHAR_UNSIGNED__, __CHAR_BIT__, __WCHAR_BIT__, __SHRT_BIT__,
 __INT_BIT__, __LONG_BIT__, __LONG_LONG_BIT__, __FLOAT_BIT__,
 __DOUBLE_BIT__, __LONG_DOUBLE_BIT__.

libstdc++-v3/

2002-08-28  Gabriel Dos Reis  <gdr@integrable-solutions.net>

	    * include/std/std_limits.h (__glibcpp_char_bits,
	    __glibcpp_short_bits, __glibcpp_int_bits,
	    __glibcpp_long_bits,
	    __glibcpp_long_long_bits, __glibcpp_float_bits,
	    __glibcpp_double_bits, __glibcpp_long_double_bits):
	    Remove.  Use
	    compiler predifined macros.
	    (__glibcpp_wchar_t_is_signed): Define based on compiler
	    predefined
	    __WCHAR_UNSIGNED__.

From-SVN: r56646

3 files changed, 56 insertions, 6 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 17b0ffe..223d00d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,13 @@
+2002-08-28  Gabriel Dos Reis  <gdr@integrable-solutions.net>
+
+	* c-common.c (builtin_define_type_precision): New function.
+	(cb_register_builtins): Use it.  Define __WCHAR_UNSIGNED__ is
+	wchar_t is unsigned in C++.
+	* doc/cpp.texi (Common Predefined Macros): Document
+	__WCHAR_UNSIGNED__, __CHAR_BIT__, __WCHAR_BIT__, __SHRT_BIT__,
+	__INT_BIT__, __LONG_BIT__, __LONG_LONG_BIT__, __FLOAT_BIT__,
+	__DOUBLE_BIT__, __LONG_DOUBLE_BIT__.
+
 2002-08-28  Sylvain Pion <pion@cs.nyu.edu>
 
 	* doc/invoke.texi (-Wreorder): Remove remaining pieces from the generic
diff --git a/gcc/c-common.c b/gcc/c-common.c
index 913aec1..4587991 100644
--- a/gcc/c-common.c
+++ b/gcc/c-common.c
@@ -760,9 +760,10 @@ static bool get_nonnull_operand		PARAMS ((tree,
 						 unsigned HOST_WIDE_INT *));
 void builtin_define_std PARAMS ((const char *));
 static void builtin_define_with_value PARAMS ((const char *, const char *,
-					       int));
+                                               int));
 static void builtin_define_type_max PARAMS ((const char *, tree, int));
 static void cpp_define_data_format PARAMS ((cpp_reader *));
+static void builtin_define_type_precision PARAMS ((const char *, tree));
 
 /* Table of machine-independent attributes common to all C-like languages.  */
 const struct attribute_spec c_common_attribute_table[] =
@@ -4765,6 +4766,17 @@ cpp_define_data_format (pfile)
   builtin_define_with_value ("__GCC_FLOAT_FORMAT__", format, 0);
 }
 
+/* Define NAME with value TYPE precision.  */
+static void
+builtin_define_type_precision (name, type)
+     const char *name;
+     tree type;
+{
+  char buf[8];
+  sprintf (buf, "%d", (int) TYPE_PRECISION (type));
+  builtin_define_with_value (name, buf, 0);
+}
+
 /* Hook that registers front end and target-specific built-ins.  */
 void
 cb_register_builtins (pfile)
@@ -4807,11 +4819,16 @@ cb_register_builtins (pfile)
   builtin_define_type_max ("__LONG_MAX__", long_integer_type_node, 1);
   builtin_define_type_max ("__LONG_LONG_MAX__", long_long_integer_type_node, 2);
 
-  {
-    char buf[8];
-    sprintf (buf, "%d", (int) TYPE_PRECISION (signed_char_type_node));
-    builtin_define_with_value ("__CHAR_BIT__", buf, 0);
-  }
+  builtin_define_type_precision ("__CHAR_BIT__", char_type_node);
+  builtin_define_type_precision ("__WCHAR_BIT__", wchar_type_node);
+  builtin_define_type_precision ("__SHRT_BIT__", short_integer_type_node);
+  builtin_define_type_precision ("__INT_BIT__", integer_type_node);
+  builtin_define_type_precision ("__LONG_BIT__", long_integer_type_node);
+  builtin_define_type_precision ("__LONG_LONG_BIT__",
+                                 long_long_integer_type_node);
+  builtin_define_type_precision ("__FLOAT_BIT__", float_type_node);
+  builtin_define_type_precision ("__DOUBLE_BIT__", double_type_node);
+  builtin_define_type_precision ("__LONG_DOUBLE_BIT__", long_double_type_node);
 
   /* For use in assembly language.  */
   builtin_define_with_value ("__REGISTER_PREFIX__", REGISTER_PREFIX, 0);
@@ -4849,6 +4866,9 @@ cb_register_builtins (pfile)
   if (!flag_signed_char)
     cpp_define (pfile, "__CHAR_UNSIGNED__");
 
+  if (c_language == clk_cplusplus && TREE_UNSIGNED (wchar_type_node))
+    cpp_define (pfile, "__WCHAR_UNSIGNED__");
+
   cpp_define_data_format (pfile);
   
   /* Make the choice of ObjC runtime visible to source code.  */
diff --git a/gcc/doc/cpp.texi b/gcc/doc/cpp.texi
index bb0c39c..0770e41 100644
--- a/gcc/doc/cpp.texi
+++ b/gcc/doc/cpp.texi
@@ -1972,6 +1972,10 @@ unsigned on the target machine.  It exists to cause the standard header
 file @file{limits.h} to work correctly.  You should not use this macro
 yourself; instead, refer to the standard macros defined in @file{limits.h}.
 
+@item __WCHAR_UNSIGNED__
+Like @code{__CHAR_UNSIGNED__}, this macro is defined if and only if the
+data type @code{wchar_t} is unsigned and the front-end is in C++ mode.
+
 @item __REGISTER_PREFIX__
 This macro expands to a single token (not a string constant) which is
 the prefix applied to CPU register names in assembly language for this
@@ -2002,6 +2006,22 @@ typedefs, respectively.  They exist to make the standard header files
 these macros directly; instead, include the appropriate headers and use
 the typedefs.
 
+@item __CHAR_BIT__
+@itemx __WCHAR_BIT__
+@itemx __SHRT_BIT__
+@itemx __INT_BIT__
+@itemx __LONG_BIT__
+@itemx __LONG_LONG_BIT__
+@itemx __FLOAT_BIT__
+@itemx __DOUBLE_BIT__
+@itemx __LONG_DOUBLE_BIT__
+These macros are defined to the number of bits used in the
+representation of the data types @code{char}, @code{wchar_t},
+@code{short}, @code{int}, @code{long}, @code{long long}, @code{float},
+@code{double} and @code{long double}.  They exist to make the standard
+header given numerical limits work correctly.  You should not use
+these macros directly; instead, include the appropriate headers.
+
 @item __USING_SJLJ_EXCEPTIONS__
 This macro is defined, with value 1, if the compiler uses the old
 mechanism based on @code{setjmp} and @code{longjmp} for exception