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windows: guard static_assert with __STDC_VERSION__ for C99 compatibility #810

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May 20, 2026
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windows: guard static_assert with __STDC_VERSION__ for C99 compatibility #810

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4 changes: 4 additions & 0 deletions windows/hidapi_descriptor_reconstruct.h
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Original file line number Diff line number Diff line change
Expand Up @@ -124,8 +124,12 @@ typedef struct hid_pp_link_collection_node_ {
// Although very unlikely, it might still be possible that the compiler creates a memory layout that is
// not binary compatile.
// Other structs are not checked at the time of writing.
// static_assert was added to <assert.h> in C11; skip this check when the
// translation unit is compiled as C99 or earlier, where it is unavailable.
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
static_assert(sizeof(struct hid_pp_link_collection_node_) == 16,
"Size of struct hid_pp_link_collection_node_ not as expected. This might break binary compatibility");
#endif

typedef struct hidp_unknown_token_ {
UCHAR Token; /* Specifies the one-byte prefix of a global item. */
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