The dls_serpath path field, as an array of length 1, introduces
unexpected array subscript checks with some compilers.
GCC versions before 3.0 treat the nested anonymous union as a
declaration of an unnamed type, and not as a member declaration,
so this construct cannot be used for these compilers.
+2019-06-19 Florian Weimer <fweimer@redhat.com>
+
+ [BZ #24166]
+ * dlfcn/dlfcn.h (Dl_serinfo): Do not use array of length 1 for
+ dls_serpath field.
+
2019-06-18 Florian Weimer <fweimer@redhat.com>
[BZ #24323]
{
size_t dls_size; /* Size in bytes of the whole buffer. */
unsigned int dls_cnt; /* Number of elements in `dls_serpath'. */
+# if __GNUC_PREREQ (3, 0)
+ /* The zero-length array avoids an unwanted array subscript check by
+ the compiler, while the surrounding anonymous union preserves the
+ historic size of the type. At the time of writing, GNU C does
+ not support structs with flexible array members in unions. */
+ __extension__ union
+ {
+ Dl_serpath dls_serpath[0]; /* Actually longer, dls_cnt elements. */
+ Dl_serpath __dls_serpath_pad[1];
+ };
+# else
Dl_serpath dls_serpath[1]; /* Actually longer, dls_cnt elements. */
+# endif
} Dl_serinfo;
#endif /* __USE_GNU */