Re: Call for help: Solaris C++ and Sun CC

[Ralf Wildenhues]

Hi Albert, Tim,

* Albert Chin wrote on Tue, Aug 23, 2005 at 05:07:24AM CEST:
> On Sun, Aug 21, 2005 at 03:46:13PM +0200, Ralf Wildenhues wrote:
> 
> We have this compiler on a Solaris 2.6 system and none of
> /opt/SUNWSpro/lib/libCstd.so, /opt/SUNWSpro/lib/v8plus/libCstd.so, and
> /opt/SUNWSpro/lib/v9/libCstd.so exist. There is no libCstd.so anywhere
> in /opt/SUNWspro/lib.

OK, good.  The system I can test on has just updated to 5.6, too,
so that issue is gone.. :)

> Unfortunately, we don't have CC v5.4 to test against. However,
> everything about 5.5 works with the patch. I say we gamble and ignore
> everything below CC v5.4 for this patch.

OK.

* Tim Mooney wrote on Fri, Aug 26, 2005 at 11:30:58PM CEST:
> 
> If I'm following that thread correctly, the original problem (needing
> -lCstd -lCrun -lc for C++) is fixed with Peter's patch and your subsequent
> fixups.  The new issue is that at least Cstd and probably Crun will be
> linked statically if the admin hasn't added the symlinks in the
> appropriate place.

ACK, at least this is my understanding of the issue.

> While I agree in principle that it would be nice for libtool to help
> people avoid shooting themselves in the foot, I think in this case it's
> more important to document the danger than it is to completely mitigate
> it.  I say this primarily because there might be quite a lot of work to
> actually get libtool to protect the user.
> 
> A comment in the docs and likely also in the Solaris C++ section of the
> code would be "good enough", I think, unless someone comes up with an easy
> way to guard against the issue.

How about this?

Cheers,
Ralf

        * README, libtool.m4 [ solaris CC ]: Document issue with C++ standard
        libraries.

Index: README
===================================================================
RCS file: /cvsroot/libtool/libtool/README,v
retrieving revision 1.17.2.3
diff -u -r1.17.2.3 README
--- README      25 Apr 2005 18:13:26 -0000      1.17.2.3
+++ README      28 Aug 2005 20:56:54 -0000
@@ -122,3 +122,8 @@
 
 9)  Note that newer Sun Studio Fortran compilers might need Autoconf macros
 not yet present in 2.59 but only in CVS Autoconf.
+
+10) Note that Sun C++ compiler versions before 5.6 may need some special
+setup to link properly against shared versions of the C++ standard libraries.
+See http://lists.gnu.org/archive/html/libtool/2005-08/msg00088.html for
+more information.
Index: libtool.m4
===================================================================
RCS file: /cvsroot/libtool/libtool/Attic/libtool.m4,v
retrieving revision 1.314.2.101
diff -u -r1.314.2.101 libtool.m4
--- libtool.m4  18 Aug 2005 06:56:19 -0000      1.314.2.101
+++ libtool.m4  28 Aug 2005 20:56:57 -0000
@@ -3749,6 +3749,9 @@
 solaris*)
   case $cc_basename in
   CC*)
+    # Adding this requires a known-good setup of shared libraries for
+    # Sun compiler versions before 5.6, else PIC objects from an old
+    # archive will be linked into the output, leading to subtle bugs.
     _LT_AC_TAGVAR(postdeps,$1)='-lCstd -lCrun'
     ;;
   esac