[ADOL-C] Building ADOL-C with OpenMP-support

[Wolfgang Lorenz]

Hi there,

Am Fri, 15 Jul 2011 09:59:12 +0200
schrieb Kshitij Kulshreshtha <kshitij at math.upb.de>:

> Hello,
> 
> As on 2011-07-13 17:09, Wolfgang Lorenz did write:
> > Hello list readers,
> > 
> > 
> > I just wanted to test the last stable version (2.2.0) of ADOL-C with
> > OpenMP support. The manual stated to configure ADOL-C using the
> > option
> > 
> >     --with-openmp-flag=<flag>
> > 
> > In case of gcc that's "-fopenmp", which is working fine with other
> > projects. However, the build process ends with:
> > 
> >     In file included from odedrivers.c:20:0:
> >     ../../../ADOL-C/src/taping_p.h:297:2: error: #error nicht hier
> > 
> > The compiler error is still present in the trunk of ADOL-C svn. The
> > context in taping_p.h reads:
> > 
> >          [...]
> >     296  #if defined(_OPENMP)
> >     297  #error nicht hier
> >          [...]
> > 
> > Is OpenMP currently not supported, is this a bug or did I miss
> > something?
> 
> Going from ADOL-C versions 2.1.* to 2.2.* we incorporated a new
> internal memory manager. This has caused several things to break,
> including OpenMP. Unfortunately for us the new memory manager was
> written by a colleague who is not involved in actively developing
> ADOL-C, so this #error is a programming relic which went uncommented
> and undetected until now. After some testing I found that the
> parallel initialization functions have not been ported to the new
> memory manager, which is why it was disabled.
> 
> Please fallback to ADOL-C 2.1.12 for using openMP for now. I'll work
> on getting it to run with the new version soon.

This is compiling all right, thank you. Just a short notice, though:
When you try to compile ADOL-C 2.1.12 with OpenMP-Support AND the
system doesn't provide the automake tools, compiling fails with: 

    [...]
    Making all in test
    make[3]: Entering directory `/tmp/adolc/ADOL-C-2.1.12/ADOL-C/test'
    ../../doltlibtool --tag=CXX   --mode=link g++  -g -O2   -o powexam powexam.o ../src/libadolc.la  -lm 
    libtool: link: g++ -g -O2 -o .libs/powexam powexam.o  ../src/.libs/libadolc.so -lm -Wl,-rpath -Wl,/home/wolfgang/adolc_base/lib64
    ../src/.libs/libadolc.so: undefined reference to `omp_get_num_threads'
    ../src/.libs/libadolc.so: undefined reference to `omp_get_thread_num'
    [...]

It helps to add the lines

    AM_CFLAGS               = @ac_adolc_cflags@
    AM_CXXFLAGS             = @ac_adolc_cxxflags@

to ADOL-C/test/Makefile.am before creating the configure script. (I
attached a patch against current SVN trunk.)


Cheers,
  Wolfgang Lorenz
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