Don't use C99 designated initializers, they're not compatible with

Visual Studio 2010.

src/H5Fsuper_cache.c

@@ -349,11 +349,7 @@ H5F__cache_superblock_get_final_load_size(const void *_image, size_t image_len,
 {
     const uint8_t *image = _image; /* Pointer into raw data buffer */
     H5F_superblock_cache_ud_t *udata = (H5F_superblock_cache_ud_t *)_udata; /* User data */
-    /* Temporary file superblock, initialized because GCC 5.5 does not
+    H5F_super_t sblock; /* Temporary file superblock */
-     * realize that H5F__superblock_prefix_decode() initializes it.
-     * TBD condition on compiler version.
-     */
-    H5F_super_t sblock = {.super_vers = 0, .sizeof_addr = 0, .sizeof_size = 0};
     htri_t ret_value = SUCCEED;         /* Return value */
 
     FUNC_ENTER_STATIC
@@ -365,6 +361,15 @@ H5F__cache_superblock_get_final_load_size(const void *_image, size_t image_len,
     HDassert(*actual_len == image_len);
     HDassert(image_len >= H5F_SUPERBLOCK_FIXED_SIZE + 6);
 
+    /* Initialize because GCC 5.5 does not realize that
+     * H5F__superblock_prefix_decode() initializes it.
+     *
+     * TBD condition on compiler version.
+     */
+    sblock.super_vers = 0;
+    sblock.sizeof_addr = 0;
+    sblock.sizeof_size = 0;
+
     /* Deserialize the file superblock's prefix */
     if(H5F__superblock_prefix_decode(&sblock, &image, udata, TRUE) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTDECODE, FAIL, "can't decode file superblock prefix")

src/H5HFcache.c

@@ -406,12 +406,7 @@ static herr_t
 H5HF__cache_hdr_get_final_load_size(const void *_image, size_t image_len,
     void *_udata, size_t *actual_len)
 {
-    /* Temporary fractal heap header, initialized because GCC 5.5 does
+    H5HF_hdr_t hdr; /* Temporary fractal heap header */
-     * not realize that the H5HF__hdr_prefix_decode() call is sufficient
-     * to initialize.  GCC 8 is clever enough to see that the variable
-     * is initialized.  TBD condition on compiler version.
-     */
-    H5HF_hdr_t hdr = {.filter_len = 0};
     const uint8_t *image = (const uint8_t *)_image;       /* Pointer into into supplied image */
     H5HF_hdr_cache_ud_t *udata = (H5HF_hdr_cache_ud_t *)_udata; /* User data for callback */
     herr_t ret_value = SUCCEED; /* Return value */
@@ -424,6 +419,12 @@ H5HF__cache_hdr_get_final_load_size(const void *_image, size_t image_len,
     HDassert(actual_len);
     HDassert(*actual_len == image_len);
 
+    /* Initialize because GCC 5.5 does not realize that the
+     * H5HF__hdr_prefix_decode() call is sufficient to initialize.
+     * GCC 8 is clever enough to see that the variable is initialized.
+     * TBD condition on compiler version.
+     */
+    hdr.filter_len = 0;
     /* Deserialize the fractal heap header's prefix */
     if(H5HF__hdr_prefix_decode(&hdr, &image) < 0)
         HGOTO_ERROR(H5E_HEAP, H5E_CANTDECODE, FAIL, "can't decode fractal heap header prefix")

src/H5HGcache.c

@@ -205,11 +205,7 @@ static herr_t
 H5HG__cache_heap_get_final_load_size(const void *image, size_t image_len,
     void *udata, size_t *actual_len)
 {
-    /* Global heap, initialized because GCC 5.5 cannot see that
+    H5HG_heap_t heap = {.size = 0}; /* Global heap */
-     * H5HG__hdr_deserialize() initializes.  TBD condition on compiler
-     * version.
-     */
-    H5HG_heap_t heap = {.size = 0};
     herr_t ret_value = SUCCEED;         /* Return value */
 
     FUNC_ENTER_STATIC
@@ -221,6 +217,12 @@ H5HG__cache_heap_get_final_load_size(const void *image, size_t image_len,
     HDassert(*actual_len == image_len);
     HDassert(image_len == H5HG_MINSIZE);
 
+    /* Initialize because GCC 5.5 cannot see that
+     * H5HG__hdr_deserialize() initializes.
+     *
+     * TBD condition on compiler version.
+     */
+    heap.size = 0;
     /* Deserialize the heap's header */
     if(H5HG__hdr_deserialize(&heap, (const uint8_t *)image, (const H5F_t *)udata) < 0)
         HGOTO_ERROR(H5E_HEAP, H5E_CANTDECODE, FAIL, "can't decode global heap prefix")