c-lex.c (yylex): With -Wtraditional...

	* c-lex.c (yylex): With -Wtraditional, when the ANSI type of an
	integer constant does not match the traditional type, limit the
	warnings to cases where the base of the type is ten.

	* invoke.texi (-Wtraditional): Document it.

From-SVN: r30730

gcc/ChangeLog

+1999-11-30  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	* c-lex.c (yylex): With -Wtraditional, when the ANSI type of an
+	integer constant does not match the traditional type, limit the
+	warnings to cases where the base of the type is ten.
+
+	* invoke.texi (-Wtraditional): Document it.
+
 Tue Nov 30 15:18:35 1999  Franz Sirl  <Franz.Sirl-kernel@lauterbach.com>
 
 	* combine.c (try_combine): Only pass SET or CLOBBER to SET_DEST

gcc/c-lex.c

@@ -1901,7 +1901,11 @@ yylex ()
 
 	    type = flag_traditional ? traditional_type : ansi_type;
 
-	    if (warn_traditional && traditional_type != ansi_type)
+	    /* We assume that constants specified in a non-decimal
+	       base are bit patterns, and that the programmer really
+	       meant what they wrote.  */
+	    if (warn_traditional && base == 10
+		&& traditional_type != ansi_type)
 	      {
 		if (TYPE_PRECISION (traditional_type)
 		    != TYPE_PRECISION (ansi_type))

gcc/invoke.texi

@@ -1692,6 +1692,12 @@ A @code{switch} statement has an operand of type @code{long}.
 @item
 A non-@code{static} function declaration follows a @code{static} one.
 This construct is not accepted by some traditional C compilers.
+
+@item
+The ANSI type of an integer constant has a different width or
+signedness from its traditional type.  This warning is only issued if
+the base of the constant is ten.  I.e. hexadecimal or octal values, which
+typically represent bit patterns, are not warned about.
 @end itemize
 
 @item -Wundef