https://sourceware.org/bugzilla/show_bug.cgi?id=30006
--- Comment #14 from Vladimir Mezentsev <vladimir.mezentsev at oracle dot com>
---
I installed Ubuntu and reproduced this problem in Docker.
This small test demonstrates the build problem:
% cat test.c
void *dlopen (const char *pathname, int mode)
{ return (void *) 0; }
__attribute__ ((__symver__ ("dlopen@GLIBC_2.1")))
void *__collector_dlopen_2_1 (const char *pathname, int mode)
{ return (void *) 0; }
__attribute__ ((__symver__ ("dlopen@GLIBC_2.0")))
void *__collector_dlopen_2_0 (const char *pathname, int mode)
{ return (void *) 0; }
int main()
{ return 0; }
% cat map.txt
GLIBC_2.0 {
global:
dlopen;
};
GLIBC_2.1 {
global:
dlopen;
};
There are no build problems on OL8:
% /opt/rh/gcc-toolset-10/root/bin/gcc -m32 test.c -Wl,--version-script
-Wl,map.txt
The output of `nm` shows exactly what I expected:
% nm ./a.out | grep dlopen
08049191 T __collector_dlopen_2_0
08049187 T __collector_dlopen_2_1
0804917d t dlopen
08049191 t dlopen@GLIBC_2.0
08049187 t dlopen@GLIBC_2.1
But on Ubunty:
% gcc -m32 test.c -Wl,--version-script -Wl,map.txt
/usr/local/bin/ld: warning: using 'GLIBC_2.0' as version for 'dlopen' which is
also named in version 'GLIBC_2.1' in script
/usr/local/bin/ld: error: /usr/local/tmp/cciDQaK2.o: multiple definition of
'dlopen'
/usr/local/bin/ld: /usr/local/tmp/cciDQaK2.o: previous definition here
collect2: error: ld returned 1 exit status
Is this a compiler bug on Ubuntu ?
I use:
% gcc --version
gcc (GCC) 12.2.1 20221102
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
% uname -a
Linux vmezents-20230117-1534-i686 5.15.0-1021-oracle #27-Ubuntu SMP Fri Oct 14
20:04:26 UTC 2022 i686 AMD EPYC 7J13 64-Core Processor AuthenticAMD GNU/Linux
Also I thing the warning is not needed.
Why dlopen cannot be in GLIBC_2.0 and GLIBC_2.1 ?
--
You are receiving this mail because:
You are on the CC list for the bug.
