Attachment 826658 Details for Bug 1032628 – Customer Test Case

Customer Test Case

Test-case-2.txt (text/plain), 1.10 KB, created by Deepu K S on 2013-11-20 13:55:32 UTC

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Creator: Deepu K S

Created: 2013-11-20 13:55:32 UTC

Size: 1.10 KB

patch

obsolete

>Statement : There are a shared object and a main executable, both have references to the constant std::string::_Rep::_S_max_size. When I link the main executable against the shared object, the value becomes zero. If not, the value is correct.
>
>$ cat foo.cpp
>#define private public
>
>#include <string>
>
>const size_t * foo()
>{
>    return &std::string::_Rep::_S_max_size;
>}
>
>$ cat main.cpp
>#define private public
>
>#include <iostream>
>#include <string>
>
>const size_t * foo();
>
>const size_t * max_size;
>
>int main()
>{
>    max_size = &std::string::_Rep::_S_max_size;
>
>    std::cout << std::hex << *max_size << " @ " << max_size << '\n'
>              << *foo() << " @ " << foo() << " (libfoo)\n";
>    return 0;
>}
>
>$ make
>g++ -O2 -fPIC -shared foo.cpp -o libfoo.so
>g++ -O2 -L. -lfoo main.cpp
>
>$ LD_LIBRARY_PATH=. ./a.out
>0 @ 0x601280
>0 @ 0x601280 (libfoo)
>
>$ g++ -O2 main-without-foo.cpp
>$ LD_LIBRARY_PATH=. ./a.out
>3ffffffffffffff9 @ 0x600dc0
>
>After Applying the patch and building glibc,
>$ ~/libc/lib/ld-linux-x86-64.so.2 --library-path .:/lib64:/usr/lib64 ./a.out
>3ffffffffffffff9 @ 0x601280
>3ffffffffffffff9 @ 0x601280 (libfoo)

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