[svn-r19479] I'm backing out my fix for bug 1707 because there're some unresolved issues - r19441 and 19466.

Bug 1707 is that H5Eset_auto causes a seg fault when an application uses -DH5_USE_16_API with 
the 1.8 library to compile.

Tested on jam - backing out, simple. 

5 files changed, 23 insertions, 46 deletions

diff --git a/src/H5.c b/src/H5.c
index ca4402b..045c65b 100644
--- a/src/H5.c
+++ b/src/H5.c
@@ -210,7 +210,7 @@ H5_term_library(void)
     int	pending, ntries = 0, n;
     size_t	at = 0;
     char	loop[1024];
-    H5E_auto_t  func;
+    H5E_auto2_t func;
 
 #ifdef H5_HAVE_THREADSAFE
     /* explicit locking of the API */
@@ -223,11 +223,8 @@ H5_term_library(void)
 	goto done;
 
     /* Check if we should display error output */
-#ifdef H5_USE_16_API_DEFAULT
-    (void)H5Eget_auto(&func, NULL);
-#else
-    (void)H5Eget_auto(H5E_DEFAULT, &func, NULL);
-#endif
+    (void)H5Eget_auto2(H5E_DEFAULT, &func, NULL);
+
     /*
      * Terminate each interface. The termination functions return a positive
      * value if they do something that might affect some other interface in a
diff --git a/src/H5E.c b/src/H5E.c
index 51cf606..1a260a2 100644
--- a/src/H5E.c
+++ b/src/H5E.c
@@ -170,18 +170,13 @@ H5E_set_default_auto(H5E_t *stk)
 {
     FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5E_set_default_auto)
 
-#ifdef H5_USE_16_API_DEFAULT
+#ifdef H5_USE_16_API
     stk->auto_op.vers = 1;
-#else /* H5_USE_16_API_DEFAULT */
+    stk->auto_op.u.func1 = (H5E_auto1_t)H5Eprint1;
+#else /* H5_USE_16_API */
     stk->auto_op.vers = 2;
-#endif /* H5_USE_16_API_DEFAULT */
-#ifdef H5_NO_DEPRECATED_SYMBOLS
-    stk->auto_op.vers = 2;
-#else
-    stk->auto_op.func1 = (H5E_auto1_t)H5Eprint1;
-#endif
-    stk->auto_op.func2 = (H5E_auto2_t)H5Eprint2;
-    stk->auto_op.user_set = FALSE;
+    stk->auto_op.u.func2 = (H5E_auto2_t)H5Eprint2;
+#endif /* H5_USE_16_API */
     stk->auto_data = NULL;
 
     FUNC_LEAVE_NOAPI(SUCCEED)
@@ -1578,12 +1573,8 @@ H5Eget_auto2(hid_t estack_id, H5E_auto2_t *func, void **client_data)
     /* Get the automatic error reporting information */
     if(H5E_get_auto(estack, &op, client_data) < 0)
         HGOTO_ERROR(H5E_ERROR, H5E_CANTGET, FAIL, "can't get automatic error info")
-
-    if(op.user_set && op.vers == 1)
-        HGOTO_ERROR(H5E_ERROR, H5E_CANTGET, FAIL, "wrong API function, H5Eset_auto1 has been called")
-
     if(func)
-        *func = op.func2;
+        *func = op.u.func2;
 
 done:
     FUNC_LEAVE_API(ret_value)
@@ -1633,8 +1624,7 @@ H5Eset_auto2(hid_t estack_id, H5E_auto2_t func, void *client_data)
 
     /* Set the automatic error reporting information */
     op.vers = 2;
-    op.user_set = TRUE;
-    op.func2 = func;
+    op.u.func2 = func;
     if(H5E_set_auto(estack, &op, client_data) < 0)
         HGOTO_ERROR(H5E_ERROR, H5E_CANTSET, FAIL, "can't set automatic error info")
 
diff --git a/src/H5Edeprec.c b/src/H5Edeprec.c
index 9f6d869..30f3ae9 100644
--- a/src/H5Edeprec.c
+++ b/src/H5Edeprec.c
@@ -389,12 +389,8 @@ H5Eget_auto1(H5E_auto1_t *func, void **client_data)
     /* Get the automatic error reporting information */
     if(H5E_get_auto(estack, &auto_op, client_data) < 0)
         HGOTO_ERROR(H5E_ERROR, H5E_CANTGET, FAIL, "can't get automatic error info")
-
-    if(auto_op.user_set && auto_op.vers == 2)
-        HGOTO_ERROR(H5E_ERROR, H5E_CANTGET, FAIL, "wrong API function, H5Eset_auto2 has been called")
-
     if(func)
-        *func = auto_op.func1;
+        *func = auto_op.u.func1;
 
 done:
     FUNC_LEAVE_API(ret_value)
@@ -440,8 +436,7 @@ H5Eset_auto1(H5E_auto1_t func, void *client_data)
 
     /* Set the automatic error reporting information */
     auto_op.vers = 1;
-    auto_op.user_set = TRUE;
-    auto_op.func1 = func;
+    auto_op.u.func1 = func;
     if(H5E_set_auto(estack, &auto_op, client_data) < 0)
         HGOTO_ERROR(H5E_ERROR, H5E_CANTSET, FAIL, "can't set automatic error info")
 
diff --git a/src/H5Eint.c b/src/H5Eint.c
index eb8c140..3cdf549 100644
--- a/src/H5Eint.c
+++ b/src/H5Eint.c
@@ -1013,15 +1013,15 @@ H5E_dump_api_stack(int is_api)
         HDassert(estack);
         if(estack->auto_op.vers == 1) {
 #ifndef H5_NO_DEPRECATED_SYMBOLS
-            if(estack->auto_op.func1)
-                (void)((estack->auto_op.func1)(estack->auto_data));
+            if(estack->auto_op.u.func1)
+                (void)((estack->auto_op.u.func1)(estack->auto_data));
 #else /* H5_NO_DEPRECATED_SYMBOLS */
             HDassert(0 && "version 1 error stack dump without deprecated symbols!");
 #endif /* H5_NO_DEPRECATED_SYMBOLS */
         } /* end if */
         else {
-            if(estack->auto_op.func2)
-                (void)((estack->auto_op.func2)(H5E_DEFAULT, estack->auto_data));
+            if(estack->auto_op.u.func2)
+                (void)((estack->auto_op.u.func2)(H5E_DEFAULT, estack->auto_data));
         } /* end else */
     } /* end if */
 
diff --git a/src/H5Epkg.h b/src/H5Epkg.h
index b9688d2..a85ddc9 100644
--- a/src/H5Epkg.h
+++ b/src/H5Epkg.h
@@ -68,20 +68,15 @@
 /****************************/
 
 /* Some syntactic sugar to make the compiler happy with two different kinds of callbacks */
-#ifndef H5_NO_DEPRECATED_SYMBOLS
-typedef struct {
-    unsigned    vers;       /* Which version callback to use */
-    hbool_t     user_set;   /* If the printing function has been set. */
-    H5E_auto1_t func1;      /* Old-style callback, NO error stack param. */
-    H5E_auto2_t func2;      /* New-style callback, with error stack param. */
-} H5E_auto_op_t;
-#else
 typedef struct {
-    unsigned    vers;       /* Which version callback to use */
-    hbool_t     user_set;   /* If the printing function has been set. */
-    H5E_auto_t  func2;      /* Only the new style callback function is available. */
+    unsigned vers;              /* Which version callback to use */
+    union {
+#ifndef H5_NO_DEPRECATED_SYMBOLS
+        H5E_auto1_t func1;      /* Old-style callback, NO error stack param. */
+#endif /* H5_NO_DEPRECATED_SYMBOLS */
+        H5E_auto2_t func2;      /* New-style callback, with error stack param. */
+    }u;
 } H5E_auto_op_t;
-#endif
 
 /* Some syntactic sugar to make the compiler happy with two different kinds of callbacks */
 typedef struct {