https://sourceware.org/bugzilla/show_bug.cgi?id=22628
Bug ID: 22628
Summary: gold ignores version of --wrap symbols
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: benjamin at benjamin dot pe
CC: ian at airs dot com
Target Milestone: ---
gold drops symbol version information from symbols being wrapped with the
--wraps command line option. (A comment source code says this is for the
convenience of wrappers.) Unfortunately, that breaks excessively clever code
like this:
[wrapper.c]
#include <string.h>
__asm__(".symver memcpy,memcpy@GLIBC_2.2.5");
void* __wrap_memcpy(void* dest, const void* src, size_t n) {
return memcpy(dest, src, n);
}
In the hands of gold, __wrap_memcpy() is linked into an infinite loop:
$ gcc -O3 -fuse-ld=gold -shared -o wrapped.so wrapper.c -Wl,--wrap=memcpy
$ objdump -d wrapped.so | grep -A1 __wrap_memcpy\>
0000000000000670 <__wrap_memcpy>:
670: e9 0b ff ff ff jmpq 580 <__wrap_memcpy@plt>
whereas ld.bfd resolves the memcpy call to memcpy@GLIBC_2.2.5 as the code
intends:
$ gcc -O3 -fuse-ld=bfd -shared -o wrapped.so wrapper.c -Wl,--wrap=memcpy
$ objdump -d wrapped.so | grep -A1 __wrap_memcpy\>
0000000000000610 <__wrap_memcpy>:
610: e9 fb fe ff ff jmpq 510 <memcpy@plt>
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