https://sourceware.org/bugzilla/show_bug.cgi?id=33577
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
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CC| |hjl.tools at gmail dot com
--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Ali Bahrami from comment #7)
>
> As you've said at the start, and as I've mentioned at every
> opportunity, the symbol show_undef_weak is an external *reference*,
> and not a *definition*. REFerences should not be assigned to
> a verDEF index, and so show_undef_weak should not be assigned to
> BASE. It should be set to version index 0.
I didn't see it:
[hjl@gnu-tgl-3 pr33577]$ cat x.c
extern void show_undef_weak (void) __attribute__((weak));
void
foo (void)
{
if (show_undef_weak)
show_undef_weak ();
}
[hjl@gnu-tgl-3 pr33577]$ make
ld -shared --version-script=x.map -o libx.so x.o
readelf -s -D -W -V libx.so
Symbol table for image contains 4 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 NOTYPE WEAK DEFAULT UND show_undef_weak
2: 0000000000000220 17 FUNC GLOBAL DEFAULT 3 foo@@VERS_1
3: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS VERS_1
Version symbols section '.gnu.version' contains 4 entries:
Addr: 0x00000000000010ac Offset: 0x000010ac Link: 5 (.dynsym)
000: 0 (*local*) 1 (*global*) 2 (VERS_1) 2 (VERS_1)
Version definition section '.gnu.version_d' contains 2 entries:
Addr: 0x00000000000010b8 Offset: 0x000010b8 Link: 6 (.dynstr)
000000: Rev: 1 Flags: BASE Index: 1 Cnt: 1 Name: libx.so
0x001c: Rev: 1 Flags: none Index: 2 Cnt: 1 Name: VERS_1
[hjl@gnu-tgl-3 pr33577]$
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