https://sourceware.org/bugzilla/show_bug.cgi?id=22220
Bug ID: 22220
Summary: BFD linker plugin wrongly marks symbols as
PREVAILING_DEF_IRONLY
Product: binutils
Version: 2.28
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: mliska at suse dot cz
Target Milestone: ---
As mentioned here: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82172,
ld.bfd marks following symbol of libstdc++:
$ readelf -s /usr/lib64/gcc/x86_64-suse-linux/7/libstdc++.so --wide | grep
_ZNSs4_Rep20_S_empty_rep_storageE
4310: 0000000000388d40 32 OBJECT UNIQUE DEFAULT 28
_ZNSs4_Rep20_S_empty_rep_storageE@@GLIBCXX_3.4
as:
grep storage pr82172-2.res
1322 8b73ecc64ca986c5 PREVAILING_DEF_IRONLY _ZNSs4_Rep20_S_empty_rep_storageE
Which is wrong because it's a static member of basic_string class and it has
many references from libstdc++.so itself.
$ ld --version
GNU ld (GNU Binutils; openSUSE Tumbleweed) 2.28.0.20170331-2
On the other hand, ld.gold works fine:
grep storage pr82172-2.res
1322 2800fe9d29715552 PREVAILING_DEF_IRONLY_EXP
_ZNSs4_Rep20_S_empty_rep_storageE
I have a small reproducer, which shows difference of ld.gold and ld.bfs
(PREVAILING_DEF_IRONLY_EXP vs. PREVAILING_DEF_IRONLY_EXP), hopefully will be
useful:
$ cat test.h
extern int doo();
inline int *goo() {
static int xyz;
return &xyz;
}
int *boo();
$ cat lib.c
#include "test.h"
int* boo() {
return goo ();
}
$ cat main.c
#include "test.h"
int main()
{
if (boo() == goo())
__builtin_printf("good: %p\n", goo());
}
$ g++ lib.c -shared -fPIC -o libtest.so
$ g++ main.c -ltest -L. -flto -O2 --save-temps && grep xyz main.res
232 a8edc87dd4d6628a PREVAILING_DEF _ZZ3goovE3xyz
Reproducer for the original issue is here:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82172#c10
Thanks
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
bug-binutils mailing list
bug-binutils@gnu.org
https://lists.gnu.org/mailman/listinfo/bug-binutils
