https://sourceware.org/bugzilla/show_bug.cgi?id=16698
maillist-gdb at barfooze dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #7638|0 |1
is obsolete| |
Attachment #7663|0 |1
is obsolete| |
Attachment #7670|0 |1
is obsolete| |
Attachment #7671|0 |1
is obsolete| |
--- Comment #15 from maillist-gdb at barfooze dot de ---
Created attachment 7672
--> https://sourceware.org/bugzilla/attachment.cgi?id=7672&action=edit
manually reduced testcase to the bare minimum
i manually reduced libc/stdin.c to the following
typedef struct _IO_FILE FILE;
struct _IO_FILE { int lock; };
static FILE f = { .lock = -1};
FILE *const (stdin) = &f;
this construct, compiled with -g triggers the bug in another object that
references it in an unused function when linked with -s --gc-sections...
for example:
typedef struct _IO_FILE FILE;
extern FILE *const stdin;
typedef struct pcap pcap_t;
struct pcap_sf { FILE *rfile; };
struct pcap { struct pcap_sf sf; };
static void unused_func_referencing_stdin(pcap_t *p) {
if (p->sf.rfile != (stdin)) (void)fclose(p->sf.rfile);
}
int pcap_loop(pcap_t *p, int cnt, void* callback, char *user) { }
i reduced the testcase again to the bare minimum, it's just 2 files and 2 libc
files now with a total of about 20 lines
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