Suppress false positive warning from MSVC

MSVC (17.3 or earlier) reports the following warning

lz4\lib\lz4.c(527): warning C6385: Reading invalid data from 'v'.
Line 527 is : LZ4_memcpy(&v[4], v, 4);

But, obviously v[0..3] is always filled with meaningful value.
Therefore, this warning report is wrong.

We must revisit this issue with future version of MSVC.

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/lz4.c b/lib/lz4.c
index 2a31735a..654bfdf3 100644
--- a/lib/lz4.c
+++ b/lib/lz4.c
@@ -524,7 +524,14 @@ LZ4_memcpy_using_offset(BYTE* dstPtr, const BYTE* srcPtr, BYTE* dstEnd, const si
     case 2:
         LZ4_memcpy(v, srcPtr, 2);
         LZ4_memcpy(&v[2], srcPtr, 2);
+#if defined(_MSC_VER) && (_MSC_VER <= 1933) /* MSVC 2022 ver 17.3 or earlier */
+#  pragma warning(push)
+#  pragma warning(disable : 6385) /* warning C6385: Reading invalid data from 'v'. */
+#endif
         LZ4_memcpy(&v[4], v, 4);
+#if defined(_MSC_VER) && (_MSC_VER <= 1933) /* MSVC 2022 ver 17.3 or earlier */
+#  pragma warning(pop)
+#endif
         break;
     case 4:
         LZ4_memcpy(v, srcPtr, 4);