Re: Support for the Intel C++ compiler is broken

[Roberto Bagnara]

Gary V. Vaughan wrote:
> Roberto Bagnara wrote:
> |
> | Support for the Intel C++ compiler under GNU/Linux used to work,
> | starting from libtool 1.5, with version 7.1-x of the compiler.  With
> | version 8.0-x of Intel C++ things no longer work and upgrading to
> | libtool 1.5.2 does not help.
> |
> | The command
> |
> |    /bin/sh ./libtool --mode=link icpc  -g -O2   -o libfoo.la \
> |      -rpath /usr/local/lib -no-undefined foo.lo -lm
> |
> | is translated into the (incredibly hairy) command
> |
> |    icpc -shared /usr/lib/crti.o /opt/intel_cc_80/lib/crtxi.o  
> .libs/foo.o \
> |      -L/opt/intel_cc_80/lib -L/usr/lib -limf -lm -lcprts -lcxa -lunwind \
> |      -lc -lirc /opt/intel_cc_80/lib/crtxn.o /usr/lib/crtn.o  
> -Wl,-soname \
> |      -Wl,libfoo.so.0 -o .libs/libfoo.so.0.0.0
>
> My bet is that a manual invocation of:
>
> ~  icpc -shared .libs/foo.o -lm -Wl,-soname -Wl,libfoo.so.0 \
> ~    -o .libs/libfoo.so.0.0.0
>
> will work.

It does, indeed.

> It seems that icpc-8.0-x is adding the predep_ and postdep_objects itself,
> where icpc-7.1-x did not.  Is there a --version equivalent that can be used
> to distinguish the two flavours?

Yes: both version 7.1 and version 8.0 support `-V':

$ /opt/intel/compiler70/ia32/bin/icpc -V
Intel(R) C++ Compiler for 32-bit applications, Version 7.1   Build 20030909Z
Copyright (C) 1985-2003 Intel Corporation.  All rights reserved.
FOR NON-COMMERCIAL USE ONLY

GNU ld version 2.13.90.0.18 20030206
  Supported emulations:
   elf_i386
   i386linux
/usr/lib/crt1.o(.text+0x18): In function `_start':
../sysdeps/i386/elf/start.S:77: undefined reference to `main'
$
$ /opt/intel_cc_80/bin/icpc -V
Intel(R) C++ Compiler for 32-bit applications, Version 8.0   Build 20040211Z 
Package ID: l_cc_pc_8.0.058_pe060
Copyright (C) 1985-2004 Intel Corporation.  All rights reserved.
FOR NON-COMMERCIAL USE ONLY

icpc: Command line error: no files specified; for help type "icpc -help"
$

In addition, version 8.0 supports `--version':

$ /opt/intel/compiler70/ia32/bin/icpc --version
icpc: Command line warning: ignoring unknown option '-fversion'
/usr/lib/crt1.o(.text+0x18): In function `_start':
../sysdeps/i386/elf/start.S:77: undefined reference to `main'
$
$ /opt/intel_cc_80/bin/icpc --version
8.0
$

> To check my diagnosis, please edit your generated project libtool script,
> search down for '# ### BEGIN LIBTOOL TAG CONFIG: CXX' (without the quotes),
> and then below that for '# Commands used to build a shared archive.'.  Then
> remove '\$predep_objects' and '\$postdep_objects' from the assignments to
> archive_cmds and archive_expsym_cmds just below that comment.  Without
> reconfiguring (to make sure your libtool edits aren't overwritten) retry
> your make command and see whether the shorter link line above is used, and
> whether it works.

It works perfectly!

> I can commit a proper patch to the development tree based on the results of
> the above.

Great!  Please, let me know when you have done it: I will test everything
again also on larger projects and let you know how it goes.
Thanks a lot,

    Roberto

--
Prof. Roberto Bagnara
Computer Science Group
Department of Mathematics, University of Parma, Italy
http://www.cs.unipr.it/~bagnara/
mailto:address@hidden