https://sourceware.org/bugzilla/show_bug.cgi?id=27206
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
---
__asm__(".symver pthread_key_create,pthread_key_create@GLIBC_2.2.5,remove");
---
A versioned symbol must be defined in an object. Try this
[hjl@gnu-cfl-2 pr27206]$ cat libfoo.map
GLIBC_2.2.5 {
global: pthread_key_create;
};
libfoo {
global: *;
};
[hjl@gnu-cfl-2 pr27206]$ cat foo.c
#include <pthread.h>
__attribute__ ((weak))
int
pthread_key_create (pthread_key_t *key, void (*fun) (void *))
{
return 0;
}
__asm__(".symver pthread_key_create,pthread_key_create@GLIBC_2.2.5");
void destructor(void* arg) { return; }
void thread_func() {
pthread_key_t key;
pthread_key_create(&key, destructor);
}
[hjl@gnu-cfl-2 pr27206]$ make
gcc -B./ -fPIC -c -o foo.o foo.c
gcc -B./ -Wl,--version-script=libfoo.map -shared -o libfoo.so foo.o
[hjl@gnu-cfl-2 pr27206]$ readelf -rW --dyn-syms libfoo.so | grep
pthread_key_create
0000000000004018 0000000600000007 R_X86_64_JUMP_SLOT 0000000000001109
pthread_key_create@GLIBC_2.2.5 + 0
6: 0000000000001109 19 FUNC WEAK DEFAULT 14
pthread_key_create@GLIBC_2.2.5
[hjl@gnu-cfl-2 pr27206]$
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