c-typeck.c (convert_arguments): Don't check for width changes with -Wtraditional.

	* c-typeck.c (convert_arguments): Don't check for width changes
	with -Wtraditional.

	* invoke.texi (-Wtraditional): Update documentation.

testsuite:
	* gcc.dg/wtr-conversion-1.c: Don't test for width changes.

From-SVN: r41386

gcc/ChangeLog

+2001-04-16  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	* c-typeck.c (convert_arguments): Don't check for width changes
+	with -Wtraditional.
+
+	* invoke.texi (-Wtraditional): Update documentation.
+
 2001-04-16  Zack Weinberg  <zackw@stanford.edu>
 
 	* toplev.c (output_lang_identify): Delete.

gcc/c-typeck.c

@@ -1709,8 +1709,10 @@ convert_arguments (typelist, values, name, fundecl)
 		      if (formal_prec == TYPE_PRECISION (float_type_node))
 			warn_for_assignment ("%s as `float' rather than `double' due to prototype", (char *) 0, name, parmnum + 1);
 		    }
-		  /* Detect integer changing in width or signedness.  */
-		  else if (INTEGRAL_TYPE_P (type)
+		  /* Detect integer changing in width or signedness.
+		     These warnings are only activated with
+		     -Wconversion, not with -Wtraditional.  */
+		  else if (warn_conversion && INTEGRAL_TYPE_P (type)
 			   && INTEGRAL_TYPE_P (TREE_TYPE (val)))
 		    {
 		      tree would_have_been = default_conversion (val);
@@ -1755,15 +1757,10 @@ convert_arguments (typelist, values, name, fundecl)
 		      else if (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type)
 			       && TREE_UNSIGNED (TREE_TYPE (val)))
 			;
-		      /* These warnings are only activated with
-                         -Wconversion, not with -Wtraditional.  */
-		      else if (warn_conversion)
-		        {
-			  if (TREE_UNSIGNED (type))
-			    warn_for_assignment ("%s as unsigned due to prototype", (char *) 0, name, parmnum + 1);
-			  else
-			    warn_for_assignment ("%s as signed due to prototype", (char *) 0, name, parmnum + 1);
-			}
+		      else if (TREE_UNSIGNED (type))
+			warn_for_assignment ("%s as unsigned due to prototype", (char *) 0, name, parmnum + 1);
+		      else
+			warn_for_assignment ("%s as signed due to prototype", (char *) 0, name, parmnum + 1);
 		    }
 		}
 

gcc/invoke.texi

@@ -2125,9 +2125,10 @@ initializer warnings and relies on default initialization to zero in the
 traditional C case.
 
 @item
-Conversions by prototypes.  This is similar to @samp{-Wconversion} in
-that it warns about width changes and fixed/floating point conversions,
-however it does not warn about changes in signedness.
+Conversions by prototypes between fixed/floating point values and vice
+versa.  The absence of these prototypes when compiling with traditional
+C would cause serious problems.  This is a subset of the possible
+conversion warnings, for the full set use @samp{-Wconversion}.
 @end itemize
 
 @item -Wundef

gcc/testsuite/ChangeLog

+2001-04-16  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	* gcc.dg/wtr-conversion-1.c: Don't test for width changes.
+
 2001-04-12  Nathan Sidwell  <nathan@codesourcery.com>
 	
 	* g++.old-deja/g++.abi/primary3.C (main): Correct expected layout.

gcc/testsuite/gcc.dg/wtr-conversion-1.c

@@ -4,14 +4,12 @@
 /* { dg-do compile } */
 /* { dg-options "-Wtraditional" } */
 
-extern void foo_c (char);
-extern void foo_ll (long long);
+extern void foo_i (int);
 extern void foo_f (float);
 extern void foo_ld (long double);
 extern void foo_cd (__complex__ double);
 
-extern char c;
-extern long long ll;
+extern int i;
 extern float f;
 extern long double ld;
 extern __complex__ double cd;
@@ -19,32 +17,22 @@ extern __complex__ double cd;
 void
 testfunc1 (void)
 {
-  foo_c (c); /* { dg-warning "with different width" "prototype conversion warning" } */
-  foo_c (ll); /* { dg-warning "with different width" "prototype conversion warning" } */
-  foo_c (f); /* { dg-warning "as integer rather than floating" "prototype conversion warning" } */
-  foo_c (ld); /* { dg-warning "as integer rather than floating" "prototype conversion warning" } */
-  foo_c (cd); /* { dg-warning "as integer rather than complex" "prototype conversion warning" } */
+  foo_i (i);
+  foo_i (f); /* { dg-warning "as integer rather than floating" "prototype conversion warning" } */
+  foo_i (ld); /* { dg-warning "as integer rather than floating" "prototype conversion warning" } */
+  foo_i (cd); /* { dg-warning "as integer rather than complex" "prototype conversion warning" } */
 
-  foo_ll (c); /* { dg-warning "with different width" "prototype conversion warning" } */
-  foo_ll (ll);
-  foo_ll (f); /* { dg-warning "as integer rather than floating" "prototype conversion warning" } */
-  foo_ll (ld); /* { dg-warning "as integer rather than floating" "prototype conversion warning" } */
-  foo_ll (cd); /* { dg-warning "as integer rather than complex" "prototype conversion warning" } */
-
-  foo_f (c); /* { dg-warning "as floating rather than integer" "prototype conversion warning" } */
-  foo_f (ll); /* { dg-warning "as floating rather than integer" "prototype conversion warning" } */
+  foo_f (i); /* { dg-warning "as floating rather than integer" "prototype conversion warning" } */
   foo_f (f); /* { dg-warning "as `float' rather than `double'" "prototype conversion warning" } */
   foo_f (ld); /* { dg-warning "as `float' rather than `double'" "prototype conversion warning" } */
   foo_f (cd); /* { dg-warning "as floating rather than complex" "prototype conversion warning" } */
 
-  foo_ld (c); /* { dg-warning "as floating rather than integer" "prototype conversion warning" } */
-  foo_ld (ll); /* { dg-warning "as floating rather than integer" "prototype conversion warning" } */
+  foo_ld (i); /* { dg-warning "as floating rather than integer" "prototype conversion warning" } */
   foo_ld (f);
   foo_ld (ld);
   foo_ld (cd); /* { dg-warning "as floating rather than complex" "prototype conversion warning" } */
 
-  foo_cd (c); /* { dg-warning "as complex rather than integer" "prototype conversion warning" } */
-  foo_cd (ll); /* { dg-warning "as complex rather than integer" "prototype conversion warning" } */
+  foo_cd (i); /* { dg-warning "as complex rather than integer" "prototype conversion warning" } */
   foo_cd (f); /* { dg-warning "as complex rather than floating" "prototype conversion warning" } */
   foo_cd (ld); /* { dg-warning "as complex rather than floating" "prototype conversion warning" } */
   foo_cd (cd);
@@ -56,32 +44,22 @@ testfunc1 (void)
 void
 testfunc2 (void)
 {
-  foo_c (c);
-  foo_c (ll);
-  foo_c (f);
-  foo_c (ld);
-  foo_c (cd);
-
-  foo_ll (c);
-  foo_ll (ll);
-  foo_ll (f);
-  foo_ll (ld);
-  foo_ll (cd);
+  foo_i (i);
+  foo_i (f);
+  foo_i (ld);
+  foo_i (cd);
 
-  foo_f (c);
-  foo_f (ll);
+  foo_f (i);
   foo_f (f);
   foo_f (ld);
   foo_f (cd);
 
-  foo_ld (c);
-  foo_ld (ll);
+  foo_ld (i);
   foo_ld (f);
   foo_ld (ld);
   foo_ld (cd);
 
-  foo_cd (c);
-  foo_cd (ll);
+  foo_cd (i);
   foo_cd (f);
   foo_cd (ld);
   foo_cd (cd);