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libtool/mail/c++
Alexandre Oliva c3548b28ec C++ problems are documented
1998-12-09 07:50:08 +00:00

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From nobody Tue Oct 7 19:29:17 1997
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To: Akim Demaille <demaille@inf.enst.fr>
Cc: bug-libtool@gnu.org
Subject: Re: Shared libs before installation
References: <qylg1qstg1o.fsf@gargantua.enst.fr>
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From: Gordon Matzigkeit <gord@m-tech.ab.ca>
Date: 07 Oct 1997 11:52:59 -0600
In-Reply-To: Akim Demaille's message of 26 Sep 1997 14:28:51 +0200
Message-Id: <86201xcves.fsf@trick.profitpress.com>
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Hi!
>>>>> Akim Demaille writes:
AD> We once talked about this, but let's do it again :)
Okay! ;)
AD> I know this is the kind of things version numbers should
AD> solve. Nevertheless, to avoid having quickly too big a version
AD> number, the version should be set right before a _public_
AD> distribution (correct?). Not when sharing with
AD> testers/maintainers.
AD> But then they are most likely to link with an old installed
AD> version of the .so, failing to compile correctly.
Actually, you may consider having *huge* version numbers for testers,
and using tiny ones for public releases.
For testing releases use a major version corresponding with the
current date: -version-info 19971007
Then for the public release, figure out what has actually changed
since last time: -version-info 3:0:1
The huge test release major numbers will guarantee that every new test
release will require relinking, but the public versions will be
smarter and possibly backwards-compatible.
AD> I am no system guy, so I may say stupid things :)
Nothing stupid. These are legitimate questions that I will have to
answer eventually in the documentation.
Thanks for your questions,
--
Gord Matzigkeit | Proudly running pieces of the GNU operating system.
gord@m-tech.ab.ca | Jacques Cousteau loved programming in assembler.
From nobody Wed Oct 15 00:04:31 1997
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Subject: Re: dlopen [was: libs dependencies]
To: gord@m-tech.ab.ca (Gordon Matzigkeit)
Date: Tue, 14 Oct 1997 20:55:19 +0200 (MET DST)
In-Reply-To: <86wwjg1av8.fsf@trick.profitpress.com> from "Gordon Matzigkeit" at Oct 14, 97 12:02:35 pm
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>
> Hi!
>
> >>>>> Stephan Kulow writes:
>
> I think we've adequately discussed your library dependencies, but I
> wanted to comment on the dlopen support that you mention below:
>
> SK> BTW: I made some efforts to use the dlopen support in libtool. I
> SK> think, it works the way I tried it. I link staticly, if dlfcn.h
> SK> or libdl is not supported. For this I patched libtool.m4 to
> SK> support this. I had to remove the --enable-shared/static options
> SK> and replaced it with --disable-dlopen option, since it looks
> SK> somewhat strange, if you have --enable-shared in a package, where
> SK> you do not expect libs.
>
> Yes, you are right. When I fully support dlopen emulation, I will
> need to make a configure flag that can turn things on and off.
>
> SK> We create a binary, that loads libraries, that contain C++
> SK> classes derived from a specific class. So, it's not necessary,
> SK> that the binary knows, which "applets" are there while compile
> SK> time.
>
> Okay, this makes sense. This is why I generate the `symbol file' when
> -export-dynamic is given, which contains a list of symbols mapped to
> pointers in a C source file.
>
> Your solution is acceptable, and if it works for your application,
> congratulations! As I've said before, my eventual solution will be
> generic and application-independent: I will write a true dlopen
> implementation that uses a libtool `symbol file' to resolve pointers
> rather than dynamic loading of code.
>
> The C++ portion of this will need to understand name mangling, which
> is probably why you chose the easier way, of making your dlopening
> application-specific.
You say, you will write code? I tried to imagine a solution without
new code, but I failed. So you write a new linker or just a library,
that I can use in my own code?
>
> SK> This is somewhat a problem and I don't know a solution, how to
> SK> solve this. So, I added a header file, that contains all
> SK> currently known modules and this is only used, if no dlopen is
> SK> available.
>
> Okay, I think I understand. You are saying that when dlopen is not
> available, you emulate it by knowing in advance which modules have
> been linked into the executable (SANE calls this `preloading'), and
> changing your application to refer to specific C++ modules.
Yes. I have to know while compilation time of the binary, which libraries
get linked.
>
> As I've said above, when I release DLD 4.0 I'll let you know, but
> until then, your application-specific preloading is acceptable, and
> the Right Thing To Do.
Thanks, it's a pleasure to hear such comments ;)
>
> SK> Thanks for writing libtool, Stephan
>
> My pleasure! Thanks for using it, :)
BTW: Perhaps you remember, I once contacted you because of some problems
with C++ and static objects in shared libs. I found out (or read in a
news group), that most compilers on such plattforms do some magic before
calling the linker. So, what libtool have to do to support such plattforms
(Solaris, FreeBSD and perhaps some more), is to call the compiler and not
the linker to create C++ shared libs.
CC (under Solaris) has the same options then the linker, but should create
correct libraries.
Currently I set CC to CXX before I run AM_PROG_LIBTOOL to let libtool
find the correct linker options for the C++ compiler instead of the C
compiler.
I just wanted to let you know, what I found out. I thought about patching
libtool to have better support for C++, but this would mean some drastic
changes, so I left it up to you ;)
Greets, Stephan
--
Stephan Kulow (coolo@kde.org)
Student of medical CS
Medical University of Luebeck
GCS/M/MD d-x s++: a-- C+++$ ULS+++ P--- L++ E W- N- o? K--? w
!O-- !M !V PS++ !PE Y PGP++ t+ 5 X+ !R tv+ b+ DI? D- G e+>$
h--(++) r y
From nobody Thu Aug 20 09:31:03 1998
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Hi
I'd like to use libtool (ltmain.sh (GNU libtool) 1.2 togheter with the SUN C++
compiler (CC: WorkShop Compilers 4.2 30 Oct 1996 C++ 4.2) on Solaris 5.5.1.
Everything works good except if I'm trying to use C++ templates in my code and
put this in a shared library. The linker is afterwards always complaining
about missing references. The problem occurs because libtool renames
the object
files from xxx.o to xxx.lo. The SUN C++ compiler builds for himself a
Template.DB
and this somehow doens't match anymore with the object file.
Have you ever heard of this problem and do you eventually allready have
a solution?
I search in Deja News but couldn't find anything.
A solution I could think of would be to rename the xxx.lo file back to
xxx.o before
the linking phase.
Thanks for any hints.
ciao
Alois
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From: Ruslan Shevchenko <Ruslan@Shevchenko.Kiev.UA>
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envirowment:
uname -a:
SunOS satory 5.6 Generic_105181-06 sun4u sparc SUNW,Ultra-4
Sun CC 4.1
libtool 1.2
Problem:
building of shared libraries not supported.
(output of simple conffigure is attached.)
and in reality, the process of linking CC library is different,
becouse generation of templates can be doing on stage of linking.
In general, command for linking is
CC -xar -o$(LIBNAME) $(CXXFLAGS) $(OBJECTS)
If anybody will tell me, from what I must begin, I will help to
add such support.
Thanks.
--
@=
//RSSH
mailto:Ruslan@Shevchenko.Kiev.UA
CORBA in Ukraine & ex-USSR: http://www.corbadev.kiev.ua
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creating cache ./config.cache
checking host system type... sparc-sun-solaris2.6
checking target system type... sparc-sun-solaris2.6
checking build system type... sparc-sun-solaris2.6
checking for a BSD compatible install... config/install-sh -c
checking whether build environment is sane... yes
checking whether make sets ${MAKE}... yes
checking for working aclocal... found
checking for working autoconf... found
checking for working automake... found
checking for working autoheader... found
checking for working makeinfo... missing
checking for c++... no
checking for g++... no
checking for gcc... no
checking for CC... CC
checking whether the C++ compiler (CC ) works... yes
checking whether the C++ compiler (CC ) is a cross-compiler... no
checking whether we are using GNU C++... no
checking how to run the C++ preprocessor... CC -E
checking for ranlib... ranlib
checking for gcc... no
checking for cc... cc
checking whether the C compiler (cc ) works... yes
checking whether the C compiler (cc ) is a cross-compiler... no
checking whether we are using GNU C... no
checking for non-GNU ld... /usr/ucb/ld
checking if the linker (/usr/ucb/ld) is GNU ld... no
checking for BSD-compatible nm... /usr/ccs/bin/nm -p
checking whether ln -s works... yes
checking whether we are using GNU C... no
checking for cc option to produce PIC... -KPIC
checking if cc PIC flag -KPIC works... no
checking if cc static flag -Bstatic works... -Bstatic
checking if the linker (/usr/ucb/ld) is GNU ld... no
checking whether the linker (/usr/ucb/ld) supports shared libraries... yes
checking command to parse /usr/ccs/bin/nm -p output... yes
checking how to hardcode library paths into programs... immediate
checking for /usr/ucb/ld option to reload object files... -r
checking dynamic linker characteristics... solaris2.6 ld.so
checking if libtool supports shared libraries... no
checking whether to build shared libraries... no
checking whether to build static libraries... yes
checking for objdir... .libs
creating libtool
checking for a BSD compatible install... config/install-sh -c
CPPFLAGS= -I/usr/local/include
checking for OB/CORBA.h... yes
checking for JTC/JTC.h... yes
checking for OB/CosNaming.h... yes
checking for nanosleep in -lposix4... yes
solaris2.6
checking for socket in -lsocket... yes
updating cache ./config.cache
creating ./config.status
creating Makefile
creating src/Makefile
creating include/Makefile
creating tests/Makefile
creating tests/naming/Makefile
creating include/SyntaxShugarConfig.h
include/SyntaxShugarConfig.h is unchanged
--------------48AE685394F01B5105112CF0--
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by m> $objdir/a2ixlibrary.data;$echo "#define REVISION $revision" >> $objdir/a2ixlibrary.data;$AR cru $lib$libobjs;$RANLIB $lib;(cd $objdir && a2ixlibrary -32)'
hardcode_libdir_flag_spec='-L$libdir'
hardcode_minus_L=yes
;;
--- 746,758 ----
aix4*)
allow_undefined_flag=unsupported
! archive_cmds='$NM$libobjs | $global_symbol_pipe | sed '\''s/.* //'\'' > $lib.exp;$CC -o $objdir/$soname$libobjs ${wl}-bE:$lib.exp ${wl}-bM:SRE ${wl}-bnoentry;$AR $ARFLAGS $lib $objdir/$soname'
hardcode_direct=yes
hardcode_minus_L=yes
;;
amigaos*)
! archive_cmds='$rm $objdir/a2ixlibrary.data;$echo "#define NAME $libname" > $objdir/a2ixlibrary.data;$echo "#define LIBRARY_ID 1" >> $objdir/a2ixlibrary.data;$echo "#define VERSION $major" >> $objdir/a2ixlibrary.data;$echo "#define REVISION $revision" >> $objdir/a2ixlibrary.data;$AR $ARFLAGS $lib$libobjs;$RANLIB $lib;(cd $objdir && a2ixlibrary -32)'
hardcode_libdir_flag_spec='-L$libdir'
hardcode_minus_L=yes
;;
Common subdirectories: libtool-1.2/tests and libtool-1.2-patched/tests
--------------E06156B73BE5D4D4AD2BF900--
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From: Ron Romero <ron.romero@wcom.com>
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I'm trying to use libtool with C++ programs, and found that libtool
wouldn't put any C++ methods into the shared library. When I looked
into it, I found that the nm command used to create the export list
doesn't pass a -C flag. On AIX, the -C flag says to leave C++ names
mangled. Since the function names weren't mangled, the sed line
didn't recognize them as functions, so they weren't put into the .exp
file. I found that I could fix the problem by adding a -C flag to
ac_cv_path_NM in config.guess. I suppose the configure script should
check for that and do it automatically.
I'm running libtool version 1.2 on an AIX 4.2 box
(powerpc-ibm-aix4.2.1.0).
I have some test files that I can give to anyone who wants to test
this. And I can test potential fixes on my machine.
Thank you,
Ron Romero
ron.romero@wcom.com
Object Developer
WorldCom, Inc.
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