Quiet some more maybe-uninitialized warnings---each is a false positive,

*sigh*.  This is more code that may not compile with VS2010, *sigh
sigh*.

3 files changed, 16 insertions, 3 deletions

diff --git a/src/H5Fsuper_cache.c b/src/H5Fsuper_cache.c
index ecb98ed..b5e4255 100644
--- a/src/H5Fsuper_cache.c
+++ b/src/H5Fsuper_cache.c
@@ -349,7 +349,11 @@ 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 */
-    H5F_super_t sblock;                 /* Temporary file superblock */
+    /* Temporary file superblock, initialized because GCC 5.5 does not
+     * 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
diff --git a/src/H5HFcache.c b/src/H5HFcache.c
index 2d1c1f2..39dc554 100644
--- a/src/H5HFcache.c
+++ b/src/H5HFcache.c
@@ -406,7 +406,12 @@ static herr_t
 H5HF__cache_hdr_get_final_load_size(const void *_image, size_t image_len,
     void *_udata, size_t *actual_len)
 {
-    H5HF_hdr_t hdr;             /* Temporary fractal heap header */
+    /* Temporary fractal heap header, initialized 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.
+     */
+    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 */
diff --git a/src/H5HGcache.c b/src/H5HGcache.c
index 29e88df..a6c9996 100644
--- a/src/H5HGcache.c
+++ b/src/H5HGcache.c
@@ -205,7 +205,11 @@ static herr_t
 H5HG__cache_heap_get_final_load_size(const void *image, size_t image_len,
     void *udata, size_t *actual_len)
 {
-    H5HG_heap_t heap;                   /* Global heap */
+    /* Global heap, initialized because GCC 5.5 cannot see that
+     * 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