re PR c++/7804 (bad printing of fp constant in warning message)

	PR c++/7804
	* error.c (dump_expr) [REAL_CST]: Output in decimal format.

	* g++.dg/other/warning1.C: New test.

From-SVN: r57843

gcc/cp/ChangeLog

+2002-10-05  Kriang Lerdsuwanakij  <lerdsuwa@users.sourceforge.net>
+
+	PR c++/7804
+	* error.c (dump_expr) [REAL_CST]: Output in decimal format.
+
 2002-10-03  Mark Mitchell  <mark@codesourcery.com>
 
  	PR c++/7931

gcc/cp/error.c

@@ -1508,13 +1508,7 @@ dump_expr (t, flags)
       break;
 
     case REAL_CST:
-      {
-	const unsigned char *p = (const unsigned char *) &TREE_REAL_CST (t);
-	size_t i;
-	strcpy (digit_buffer, "0x");
-	for (i = 0; i < sizeof TREE_REAL_CST (t); i++)
-	  sprintf (digit_buffer + 2 + 2*i, "%02x", *p++);
-      }
+      REAL_VALUE_TO_DECIMAL (TREE_REAL_CST (t), digit_buffer, -1);
       output_add_string (scratch_buffer, digit_buffer);
       break;
 

gcc/testsuite/ChangeLog

+2002-10-05  Kriang Lerdsuwanakij  <lerdsuwa@users.sourceforge.net>
+
+	PR c++/7804
+	* g++.dg/other/warning1.C: New test.
+
 2002-10-04  Roger Sayle  <roger@eyesopen.com>
 
 	* gcc.c-torture/execute/20020720-1.x:  XFAIL instead of skipping

gcc/testsuite/g++.dg/other/warning1.C

+// { dg-do compile }
+
+// PR c++/7804
+// Floating point formatting in error and warning messages
+
+extern "C" int printf(const char *, ...);
+
+struct S
+{
+  static const float inf = 1.0f / 0.0f; // { dg-warning "1.0|initialization" }
+  static const float nan = 0.0f / 0.0f; // { dg-warning "0.0|initialization" }
+};
+
+int main()
+{
+  printf("%f\n%f\n", S::inf, S::nan);
+  return 0;
+}