[Bug c++/60731] [4.7/4.8/4.9 Regression] dynamic library not getting reinitialized on multiple calls to dlopen()

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60731

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-04-02
      Known to work|                            |4.4.7
   Target Milestone|---                         |4.7.4
            Summary|dynamic library not getting |[4.7/4.8/4.9 Regression]
                   |reinitialized on multiple   |dynamic library not getting
                   |calls to dlopen()           |reinitialized on multiple
                   |                            |calls to dlopen()
     Ever confirmed|0                           |1
      Known to fail|                            |4.5.4, 4.8.2, 4.9.0

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Works up to GCC 4.4, fails since GCC 4.5.  It's not clear what makes the
difference here.

Btw, with LD_DEBUG=all I see


     10389:     opening file=./static.so [0]; direct_opencount=2
     10389:
     10389:     symbol=routine;  lookup in file=./static.so [0]
     10389:     binding file ./static.so [0] to ./static.so [0]: normal symbol
`routine'
count:2

     10389:     opening file=./static.so [0]; direct_opencount=3
     10389:
     10389:     symbol=routine;  lookup in file=./static.so [0]
     10389:     binding file ./static.so [0] to ./static.so [0]: normal symbol
`routine'
count:3

so the dlclose call does nothing.  While in the working case:

     10438:
     10438:     file=./static.so [0];  dynamically loaded by ./test_static [0]
     10438:     file=./static.so [0];  generating link map
     10438:       dynamic: 0x00007ffff6ffede0  base: 0x00007ffff6dfd000   size:
0x00000000002020a8
     10438:         entry: 0x00007ffff6dfdb10  phdr: 0x00007ffff6dfd040  phnum:
                 7
....
     10438:     calling init: ./static.so
     10438:
     10438:     opening file=./static.so [0]; direct_opencount=1
     10438:
     10438:     symbol=routine;  lookup in file=./static.so [0]
     10438:     binding file ./static.so [0] to ./static.so [0]: normal symbol
`routine'
count:1
     10438:
     10438:     calling fini: ./static.so [0]
     10438:
     10438:
     10438:     file=./static.so [0];  destroying link map