Re: Exceptions in shared lib with icc on Linux

[Martin Frydl]

I've looked into it and found two places which almost always rewrite 
archive_cmds_need_lc to yes. Both are in libtool.m4.

Line 3412:
case " $_LT_AC_TAGVAR(postdeps, $1) " in
*" -lc "*) _LT_AC_TAGVAR(archive_cmds_need_lc, $1)=no ;;
*) _LT_AC_TAGVAR(archive_cmds_need_lc, $1)=yes ;;
esac

Since postdeps for icc does not contain -lc, archive_cmds_need_lc is set 
to yes. I haven't looked how postdeps are determined but this looks like 
 -lc is always used - either it is in postdeps or added later due to 
archive_cmds_need_lc=yes.

Line 5402:
Here archive_cmds_need_lc is always set to yes and only if used compiler 
is gcc, it may be reset to no.

I don't know why the two places above don't honour previous value of 
archive_cmds_need_lc. I've commented out both lines setting yes and 
built was successful (I've also modified line 2937 - removed -nostdlib). 
The built with gcc and Sun's CC was also successful, but this is 
definitelly not a correct solution.

Martin

Robert Boehne wrote:
> Albert,
>
> I think it may be that an Autoconf macro is re-setting this
> later on.  I seem to get "archive_cmds_need_lc=yes" in nearly
> every case I look at.
>
> Robert
>
>
> Albert Chin wrote:
>
> > On Mon, Jan 06, 2003 at 05:29:04PM +0100, Martin Frydl wrote:
> >
> > >  I've found problem when throwing exception from shared library when
> > > compiled with icc on Linux. I've attached a test case. The source of
> > > this problem is probably linking against c library. Libtool uses this
> > > command line:
> > >
> > > icpc -shared -nostdlib .libs/sub1.o -lc -Qoption,ld,-soname \
> > >  -Qoption,ld,libshr.so.0 -o .libs/libshr.so.0.0.0
> >
> > Odd that -lc got in there. From libtool.m4 in CVS:
> >      icpc)
> >        # Intel C++
> >        with_gnu_ld=yes
> >        _LT_AC_TAGVAR(archive_cmds_need_lc, $1)=no
> >
> > I presume archive_cmds_need_lc=no means that -lc should not be added.
> > Anyone know more?
> >
> > --
> > albert chin (address@hidden)
> >
> > _______________________________________________
> > Libtool mailing list
> > address@hidden
> > http://mail.gnu.org/mailman/listinfo/libtool
>
>
>
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