egcs-970929: SunOS and --enable-shared - HOW?

[Manfred Hollstein]

On , 9 October 1997, 06:18:16, oliva@dcc.unicamp.br wrote:

    Manfred Hollstein writes:
    
    > Can anybody who believes  to  have built a  shared libstdc++  on SunOS
    > successfully shed some light on this?
    
    I build egcs with shared libraries regularly on SunOS 4.1.3
    
    The only non-trivial trick I use is to create a soft-link
    egcs-<date>/gcc/real-ld -> GNU ld.  I also create such links in the
    several stage subdirectories.
    
Thanks, I just tried it, and it doesn't fail now. BUT, it's not correct:

Take a look at the command line how the various libstdc++.so get built

$ /u/b60/manfred/work/GNU/egcs-971008-sparc-sun-sunos4.1.4/gcc/xgcc -B/u/b60/manfred/work/GNU/egcs-971008-sparc-sun-sunos4.1.4/gcc/ -g -O2 -fno-implicit-templates  -fpic -mcpu=v8 -fPIC -shared -o libstdc++.so.2.8.0 `cat piclist` 

As you can see, both `-fpic' and `-fPIC' are used; the former comes from

  for i in `${compiler} --print-multi-lib 2>/dev/null`; do \

while the latter comes hardcoded from config/mh-sparcpic which defines

PICFLAG=-fPIC

What we end up with is shared libs all built with -fPIC instead of what was
intended by --print-multi-lib.

The problem here is, that $(PICFLAG) overrides everything that the multilib stuff
defines different. Even more, since both flags are used, (x)gcc fails to add the
proper -L<directory-which-contains-the-appropriate-libgcc.a> hence using the
libgcc.a in ${libsubdir} which hasn't been built using any pic flags :-( This is
the reason, why it fails with SunOS's native ld. It doesn't fail with GNU ld,
because:

`-assert KEYWORD'
     This option is ignored for SunOS compatibility.

IMHO, we have to find a way

  - to ignore what PICFLAG defines if the passed multi-lib options include
    any pic related option
  - and to use PICFLAG, if the multi-lib options don't include any pic flags.

Yesterday, I tried various hacks, but they all fail, because PICFLAG is
contained in FLAGS_TO_PASS; if we omit it there, we could use something like

PICFLAG = `if test -z "${MULTISUBDIR}"; then echo -fPIC; else case "${LIBCFLAGS} ${LIBCXXFLAGS}" in *-fpic* ) echo -fpic ;; * ) echo -fPIC ;; esac; true; fi`

in config/mh-sparcpic letting every subdir Makefile define PICFLAG properly.

What do you think?

--
 Manfred Hollstein                               Alcatel, Dept. US/EC4
 < mailto:manfred@lts.sel.alcatel.de >             Lorenzstrasse 10
                                                 70435 Stuttgart
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