[Bug ld/17479] New: Shared object missing symbol explicitly specified in --retain-symbols-file

[predictivestatmech at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17479

            Bug ID: 17479
           Summary: Shared object missing symbol explicitly specified in
                    --retain-symbols-file
           Product: binutils
           Version: 2.20
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: predictivestatmech at gmail dot com

I'm creating a shared library packaging a monstrous proliferation of small
static libraries (compiled from fortran sources using -fPIC ... with objects
from each directory bundled to the static libs with ar).

Since there is some duplication in symbol names between the .a files, I am
specifying the complete list of (77) exports with
--retain-symbols-file=sym.list inside the final link line:

<ore><code>gfortran -shared -Wl,--retain-symbols-file=sym.list
-L$HOME/build/nwchem-6.3/lib/LINUX64
-L$HOME/build/nwchem-6.3/src/tools/install/lib -fPIC -o
$HOME/build/nwchem-6.3/lib/LINUX64/libnwchem.so libnwchem.o stubs.o
-Wl,--start-group -lnwctask -lccsd -lmcscf -lselci -lmp2 -lmoints -lstepper
-ldriver -loptim -lnwdft -lgradients -lcphf -lesp -lddscf -ldangchang -lguess
-lhessian -lvib -lnwcutil -lrimp2 -lproperty -lnwints -lprepar -lnwmd -lnwpw
-lofpw -lpaw -lpspw -lband -lnwpwlib -lnwxc -lcafe -lspace -lanalyze -lqhop
-lpfft -ldplot -ldrdy -lvscf -lqmmm -lqmd -letrans -lpspw -ltce -lbq -lcons
-lperfm -ldntmc -lccca -lnwcutil -lga -larmci -lpeigs -lperfm -lcons -lbq
-lnwcutil -Wl,--end-group (external dependency libraries)</code></pre>

Although linking produces an 80Mb library which loads without errors with
python's ctypes (CDLL("libnwchem.so")), when trying to use it, I found that at
least two of the functions are missing.

    File "/usr/lib64/python2.6/ctypes/__init__.py", line 371, in __getitem__
        func = self._FuncPtr((name_or_ordinal, self))
    AttributeError: libnwchem.so: undefined symbol: push_inp_cstring

Which I think is a bit odd, since that is specifically listed as the first line
at the top of the sym.list file,

    push_inp_cstring
    input_parse_
    nwchem_init_
    nwchem_dtor_
    task_input_
    task_
    ...

If I ignore the missing push_inp_cstring, the next missing function out of the
list above is "task_".


The relevant object is in the static library:

    nm -s ../lib/LINUX64/libnwcutil.a | grep push_inp
    push_inp_string_ in nw_inp_from_file.o
    push_inp_cstring in push_inp_cstring.o
    0000000000000430 T push_inp_string_
    0000000000000038 d push_inp_string_$BLK$format_pack.0.4
    push_inp_cstring.o:
    0000000000000000 T push_inp_cstring
                     U push_inp_string_

but not in the dynamic one (verified with readelf --syms).

The same happens for task_
nm -s ../lib/LINUX64/libnwctask.a | grep "task_ *$"
                 U stpr_walk_task_
0000000000000000 T task_


Is the zero-address a clue here, or the source of a failed link?

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