[Bug gold/15098] New: DT_RPATH isn't set with -rpath on Linux

[hjl.tools at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15098

             Bug #: 15098
           Summary: DT_RPATH isn't set with -rpath on Linux
           Product: binutils
           Version: 2.24 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
        AssignedTo: address@hidden
        ReportedBy: address@hidden
                CC: address@hidden
    Classification: Unclassified


According to gABI,

The set of directories specified by a given DT_RUNPATH entry is used to
find only the immediate dependencies of the executable or shared object
containing the DT_RUNPATH entry. That is, it is used only for those
dependencies contained in the DT_NEEDED entries of the dynamic structure
containing the DT_RUNPATH entry, itself. One object's DT_RUNPATH entry
does not affect the search for any other object's dependencies.

That means DT_RUNPATH on executable doesn't apply to shared objects
which executable depends on:

address@hidden pr15096a]$ cat foo.c
#include <stdio.h>
#include <dlfcn.h>

int
main ()
{
  typedef int (*hello_t)();
  hello_t hello1;
  void* handle = dlopen("libso1.so", RTLD_LAZY);

  if (!handle)
    {
      printf ("dlopen: %s\n", dlerror ());
      return 1;
    }

  hello1 = (hello_t)dlsym(handle, "hello1");
  hello1();
  return 0;
}
address@hidden pr15096a]$ cat so1.c
extern void hello2 (void);

void 
hello1 (void)
{
  hello2();
}
address@hidden pr15096a]$ cat so2.c
#include <stdio.h>

void
hello2 ()
{
  printf ("hello\n");
}
address@hidden pr15096a]$ make
gcc -fPIC -O2 -shared -o libso2.so so2.c
gcc -fPIC -O2 -shared -o libso1.so so1.c libso2.so
gcc -B./ -o foo2 foo.c -Wl,-rpath,. -ldl
readelf -d foo2

Dynamic section at offset 0x890 contains 26 entries:
  Tag        Type                         Name/Value
 0x0000000000000003 (PLTGOT)             0x401a88
 0x0000000000000002 (PLTRELSZ)           120 (bytes)
 0x0000000000000017 (JMPREL)             0x400488
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000007 (RELA)               0x400470
 0x0000000000000008 (RELASZ)             24 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x0000000000000015 (DEBUG)              0x0
 0x0000000000000006 (SYMTAB)             0x400260
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000005 (STRTAB)             0x400350
 0x000000000000000a (STRSZ)              171 (bytes)
 0x000000006ffffef5 (GNU_HASH)           0x400400
 0x0000000000000001 (NEEDED)             Shared library: [libdl.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x000000000000000c (INIT)               0x400500
 0x000000000000000d (FINI)               0x400784
 0x000000000000001a (FINI_ARRAY)         0x401ad8
 0x000000000000001c (FINI_ARRAYSZ)       8 (bytes)
 0x0000000000000019 (INIT_ARRAY)         0x401ae0
 0x000000000000001b (INIT_ARRAYSZ)       8 (bytes)
 0x000000000000001d (RUNPATH)            Library runpath: [.]
 0x000000006ffffff0 (VERSYM)             0x40041c
 0x000000006ffffffe (VERNEED)            0x400430
 0x000000006fffffff (VERNEEDNUM)         2
 0x0000000000000000 (NULL)               0x0
./foo2
dlopen: libso2.so: cannot open shared object file: No such file or directory
make: *** [all] Error 1
address@hidden pr15096a]$ 

This is introduced by

http://sourceware.org/git/?p=binutils.git;a=commit;h=0e0646ad6f21c4d6230c31f452b73f133f4b5777

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