[Bug ld/20159] New: Dynamic Linking Change for Shared Libraries (1.24 to 1.26)

[paul.braman at nielsen dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20159

            Bug ID: 20159
           Summary: Dynamic Linking Change for Shared Libraries (1.24 to
                    1.26)
           Product: binutils
           Version: 2.26
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: paul.braman at nielsen dot com
  Target Milestone: ---

I get different results in Ubuntu 14.04 (GCC 4.8.4/GNU ld 2.24) and Ubuntu
16.04 (GCC 5.3.1/GNU ld 2.26) when building the following test code:

    nothing.c:
    #include <stdio.h>
    #include <time.h>
    void nothing( )
    {
        printf( "%lld\n", (long long)time( NULL ) );
    }

    something.c:
    #include <stdio.h>
    #include <time.h>
    extern void nothing( void );
    int main( )
    {
        printf( "%lld\n", (long long)time( NULL ) );
        nothing( );
        return 0;
    }

    faketime.c:
    #include <time.h>
    time_t time( time_t * ptr )
    {
        return 42;
    }

... using the commands:

    gcc -fPIC -c -o nothing.lo nothing.c
    gcc -shared -rdynamic -o libnothing.so nothing.lo
    gcc -o something something.c faketime.c -Wl,-rpath=. -L. -lnothing

Ubuntu 14.04 says the answer is "42/42" while Ubuntu 16.04 says the answer is
"42/1464287587" (insert your current Unix timestamp).

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