Root cause (credit Richard Biener)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115432
struct file_output_stream
{
union
{
void *voidp;
int fd;
} data;
const output_stream_vtbl* vtbl;
};
struct output_stream
{
void* data;
const output_stream_vtbl* vtbl;
};
those are two unrelated types. Doing
((file_output_stream *)p)->vtbl = x;
... = ((output_stream *)p)->vtbl;
is invoking undefined behavior (unless -fno-strict-aliasing).
** Bug watch added: GCC Bugzilla #115432
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115432
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https://bugs.launchpad.net/bugs/2068731
Title:
yadifad crashes on start up
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