Fix or hide warnings from GCC 7's -Wimplicit-fallthrough.
diff --git a/src/liblzma/lzma/lzma_decoder.c b/src/liblzma/lzma/lzma_decoder.c
index eedc073..d0f29b7 100644
--- a/src/liblzma/lzma/lzma_decoder.c
+++ b/src/liblzma/lzma/lzma_decoder.c
@@ -16,6 +16,12 @@
#include "lzma_decoder.h"
#include "range_decoder.h"
+// The macros unroll loops with switch statements.
+// Silence warnings about missing fall-through comments.
+#if TUKLIB_GNUC_REQ(7, 0)
+# pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+#endif
+
#ifdef HAVE_SMALL
diff --git a/src/xz/list.c b/src/xz/list.c
index bf46295..ef93314 100644
--- a/src/xz/list.c
+++ b/src/xz/list.c
@@ -318,6 +318,8 @@
// If the above fails, the file is corrupt so
// LZMA_DATA_ERROR is a good error code.
+ // Fall through
+
case LZMA_DATA_ERROR:
// Free the memory allocated by lzma_block_header_decode().
for (size_t i = 0; filters[i].id != LZMA_VLI_UNKNOWN; ++i)
