Patch to document non-support for -fcond-mismatch for C++

["Joseph S. Myers" <jsm28 at cam dot ac dot uk>]

When looking at the many C/C++ common options that ought to go in
c-common.[ch] (even if the implementation is separate for the front
ends, I think it is worthwhile to put the flag variable in common code
where the meaning of the flag is the same, and initialise it in
lang_init_options if different values are needed in the different
front ends), I noticed that -fcond-mismatch now has no effect in the
C++ front end.  Accordingly, this patch makes it explicitly
unsupported for C++.

Bootstrapped with no regressions on i686-pc-linux-gnu.  OK to commit?

2001-01-05  Joseph S. Myers  <jsm28@cam.ac.uk>

	* invoke.texi: Document that -fcond-mismatch isn't supported for
	C++.

2001-01-05  Joseph S. Myers  <jsm28@cam.ac.uk>

	* cp-tree.h (flag_cond_mismatch): Don't declare.
	* decl2.c (flag_cond_mismatch): Don't define.
	(lang_f_options): Remove cond-mismatch.
	(unsupported_options): Add cond-mismatch.

--- invoke.texi.orig	Wed Jan  3 18:58:45 2001
+++ invoke.texi	Fri Jan  5 12:08:12 2001
@@ -1061,7 +1061,8 @@

 @item -fcond-mismatch
 Allow conditional expressions with mismatched types in the second and
-third arguments.  The value of such an expression is void.
+third arguments.  The value of such an expression is void.  This option
+is not supported for C++.

 @item -funsigned-char
 Let the type @code{char} be unsigned, like @code{unsigned char}.
--- cp/cp-tree.h.orig	Thu Jan  4 23:32:31 2001
+++ cp/cp-tree.h	Fri Jan  5 12:06:09 2001
@@ -990,11 +990,6 @@

 extern int dollars_in_ident;

-/* Nonzero means allow type mismatches in conditional expressions;
-   just make their values `void'.   */
-
-extern int flag_cond_mismatch;
-
 /* Nonzero means don't recognize the keyword `asm'.  */

 extern int flag_no_asm;
--- cp/decl2.c.orig	Thu Jan  4 23:32:02 2001
+++ cp/decl2.c	Fri Jan  5 12:09:08 2001
@@ -139,11 +139,6 @@ static tree decl_namespace_list;

 /* C (and C++) language-specific option variables.  */

-/* Nonzero means allow type mismatches in conditional expressions;
-   just make their values `void'.   */
-
-int flag_cond_mismatch;
-
 /* Nonzero means don't recognize the keyword `asm'.  */

 int flag_no_asm;
@@ -492,7 +487,6 @@ lang_f_options[] =
   {"short-enums", &flag_short_enums, 1},
   {"short-double", &flag_short_double, 1},
   {"short-wchar", &flag_short_wchar, 1},
-  {"cond-mismatch", &flag_cond_mismatch, 1},
   {"asm", &flag_no_asm, 0},
   {"builtin", &flag_no_builtin, 0},

@@ -536,6 +530,7 @@ lang_f_options[] =
    listed here.  This table must be kept in alphabetical order.  */
 static const char * const unsupported_options[] = {
   "all-virtual",
+  "cond-mismatch",
   "enum-int-equiv",
   "guiding-decls",
   "nonnull-objects",

-- 
Joseph S. Myers
jsm28@cam.ac.uk