[Bug ld/19579] [Regression] link error linking fortran code on s390x-linux-gnu

[krebbel at linux dot vnet.ibm.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19579

Andreas Krebbel <krebbel at linux dot vnet.ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |krebbel at linux dot 
vnet.ibm.com

--- Comment #5 from Andreas Krebbel <krebbel at linux dot vnet.ibm.com> ---
I can reproduce the failure building mopac7-1.15 with -fPIC and -pie.  The
problem disappears when omitting -pie.

The error gets reported after elf_s390_finish_dynamic_symbol returned false
here:

      else if (bfd_link_pic (info)
          && SYMBOL_REFERENCES_LOCAL (info, h))
        {
          /* If this is a static link, or it is a -Bsymbolic link and
             the symbol is defined locally or was forced to be local
             because of a version file, we just want to emit a
             RELATIVE reloc.  The entry in the global offset table
             will already have been initialized in the
             relocate_section function.  */
---->     if (!h->def_regular)
            return FALSE;

The symbol in question is geovar_ :

$ readelf -s ./.libs/libmopac7.so | grep geovar_
   388: 000000000399f920  8656 OBJECT  GLOBAL DEFAULT   22 geovar_
  5819: 000000000399f920  8656 OBJECT  GLOBAL DEFAULT   22 geovar_
$ readelf -s mopac7app.o | grep geovar
   160: 0000000000000008  5768 OBJECT  GLOBAL DEFAULT  COM geovar_

It is not clear to me yet how this is supposed to work correctly yet. As usual
I've tried to figure out what x86 is doing but I ran into similiar problems:

with 2.23.52 I see the very same problem as on s390:

/bin/sh ../libtool --tag=F77   --mode=link gfortran  -g -O2 -std=legacy
-fno-automatic -fPIC -lm -Wl,--
gfortran -g -O2 -std=legacy -fno-automatic -fPIC -Wl,--as-needed -Wl,-z
-Wl,defs -pie -o .libs/mopac7 m
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
make[1]: *** [mopac7] Error 1

Using head binutils however I get:
gfortran -g -O2 -std=legacy -fno-automatic -fPIC -Wl,--as-needed -Wl,-z
-Wl,defs -pie -o .libs/mopac7 mopac7app.o  ./.libs/libmopac7.so -lm 
-Wl,--rpath -Wl,/home/andreas/mopac/install/lib
/home/andreas/binutils/binutils-26022016-install/bin/ld: mopac7app.o:
relocation R_X86_64_PC32 against undefined symbol `geokst_' can not be used
when making a shared object; recompile with -fPIC
/home/andreas/binutils/binutils-26022016-install/bin/ld: final link failed: Bad
value

Although everything is built with -fPIC

I'll continue next week.

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