c-typeck.c (process_init_element): Avoid union init warnings on floating point zero.

	* c-typeck.c (process_init_element): Avoid union init warnings on
	floating point zero.  Don't crash on unions containing structs.

testsuite:
	* gcc.dg/wtr-union-init-2.c, gcc.dg/wtr-union-init-3.c: New tests.

From-SVN: r36358

gcc/ChangeLog

+2000-09-12  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	* c-typeck.c (process_init_element): Avoid union init warnings on
+	floating point zero.  Don't crash on unions containing structs.
+
 2000-09-12  Alexandre Oliva  <aoliva@redhat.com>
 
 	* config/sh/sh.h (PREDICATE_CODES): Add CONST_DOUBLE to

gcc/c-typeck.c

@@ -6394,7 +6394,8 @@ process_init_element (value)
 	     code appears conditioned on e.g. __STDC__ to avoid
 	     "missing initializer" warnings and relies on default
 	     initialization to zero in the traditional C case.  */
-	  if (warn_traditional && !in_system_header && !integer_zerop (value))
+	  if (warn_traditional && !in_system_header
+	      && !(value && (integer_zerop (value) || real_zerop (value))))
 	    warning ("traditional C rejects initialization of unions");
 
 	  /* Accept a string constant to initialize a subarray.  */

gcc/testsuite/ChangeLog

+2000-09-12  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	* gcc.dg/wtr-union-init-2.c, gcc.dg/wtr-union-init-3.c: New tests.
+
 2000-09-11  Zack Weinberg  <zack@wolery.cumb.org>
 
 	* gcc.dg/cpp/backslash.c: New test.

gcc/testsuite/gcc.dg/wtr-union-init-2.c

+/* Test for -Wtraditional warnings on union initialization.
+   Note, gcc should omit these warnings in system header files.
+   By Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 9/11/2000.  */
+/* { dg-do compile } */
+/* { dg-options "-Wtraditional" } */
+
+union foo1
+{
+  float f;
+  int i;
+  long l;
+};
+
+union foo2
+{
+  int i;
+  float f;
+  long l;
+};
+
+void
+testfunc (void)
+{
+  /* Note we only warn for non-zero initializers.  */
+  static union foo1 f1 = {0};
+  static union foo2 f2 = {0};
+  static union foo1 f3 = {1}; /* { dg-warning "traditional C rejects initialization of unions" "initialization of unions" } */
+  static union foo2 f4 = {1}; /* { dg-warning "traditional C rejects initialization of unions" "initialization of unions" } */
+  static union foo1 f5 = {0.0};
+  static union foo2 f6 = {0.0};
+  static union foo1 f7 = {1.0}; /* { dg-warning "traditional C rejects initialization of unions" "initialization of unions" } */
+  static union foo2 f8 = {1.0}; /* { dg-warning "traditional C rejects initialization of unions" "initialization of unions" } */
+
+#line 35 "sys-header.h" 3
+/* We are in system headers now, no -Wtraditional warnings should issue.  */
+
+  static union foo1 b1 = {0};
+  static union foo2 b2 = {0};
+  static union foo1 b3 = {1};
+  static union foo2 b4 = {1};
+  static union foo1 b5 = {0.0};
+  static union foo2 b6 = {0.0};
+  static union foo1 b7 = {1.0};
+  static union foo2 b8 = {1.0};
+}

gcc/testsuite/gcc.dg/wtr-union-init-3.c

+/* Test for -Wtraditional warnings on union initialization.
+   Note, gcc should omit these warnings in system header files.
+   By Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 9/11/2000.  */
+/* { dg-do compile } */
+/* { dg-options "-Wtraditional" } */
+
+struct bar
+{
+  int i;
+  long j;
+};
+
+union foo
+{
+  struct bar b;
+  int i;
+  long l;
+};
+
+union foo2
+{
+  int i;
+  long l;
+};
+
+struct baz
+{
+  int a;
+  double b;
+  union foo c;
+};
+
+struct baz2
+{
+  int a;
+  double b;
+  union foo2 c;
+};
+
+void
+testfunc (void)
+{
+  /* Note we only warn for non-zero initializers.  Xfail on substructures. */
+  static union foo f1 = {{0,0}}; /* { dg-bogus "traditional C rejects initialization of unions" "initialization of unions" { xfail *-*-* } } */
+  static union foo f2 = {{1,1}}; /* { dg-warning "traditional C rejects initialization of unions" "initialization of unions" } */
+
+  static struct baz f3 = { 1, 2, {{0,0}} }; /* { dg-bogus "traditional C rejects initialization of unions" "initialization of unions" { xfail *-*-* } } */
+  static struct baz f4 = { 1, 2, {{1,1}} }; /* { dg-warning "traditional C rejects initialization of unions" "initialization of unions" } */
+
+  static struct baz2 f5 = { 1, 2, {0} };
+  static struct baz2 f6 = { 1, 2, {1} }; /* { dg-warning "traditional C rejects initialization of unions" "initialization of unions" } */
+
+#line 54 "sys-header.h" 3
+/* We are in system headers now, no -Wtraditional warnings should issue.  */
+
+  static union foo b1 = {{0,0}};
+  static union foo b2 = {{1,1}};
+
+  static struct baz b3 = { 1, 2, {{0,0}} };
+  static struct baz b4 = { 1, 2, {{1,1}} };
+
+  static struct baz2 b5 = { 1, 2, {0} };
+  static struct baz2 b6 = { 1, 2, {1} };
+}