CGAL users discussion list

Dear all,

I posted a question about how to compile TAUCS with VC8.0 some days ago. With 
the help of Laurent Saboret, I successfully compiled it with his latest 
script build_taucs_win32_for_CGAL.bat.

But I still can not achieve my goal currently.

The reason I want to recompile TAUCS is that I want to use LU decomposition 
to solve linear system with unsymmetric system matrix. As we know, taucs 
provided an out-of-core LU solver 'taucs_ooc_factor_lu' and 
'taucs_ooc_solve_lu'. This implementation can be very slow. So I want to use 
SuperLU instead. I find that there are already two interface functions 
('taucs_ccs_factor_superlu' and 'taucs_ccs_solve_superlu') for SuperLU 
defined in '\src\taucs_superlu.c'. Unfortunately, TAUCS does not compile this 
file and hence there seems no way to access superlu with default 
configuration!

As a result, I decide to make some changes to TAUCS compilation config.

The way I do this is as follows (take the _MT runtime for example):

0) I modified '\src\taucs_superlu.c' to use the latest SuperLU (v3.0) 
functions. This step is tested to be correct as the compilation has passsed.

1) I modified '\configurator\taucs_structure.h' by adding an items in module 
definition:
{ "SUPERLU", include, 0 , {"BASE", 0}, {"taucs_superlu", 0}, "libtaucs", 
{"LIBSUPERLU", 0} }

also, I added the source file definitino into 'struct file file[]':
{ "taucs_superlu", "DIRSRC", csource|dreal }

by doing this, the generated '\build\win32_MT\makefile' looks correct with 
the following sentences appearing:

LIBS = $(LIBLAPACK) $(LIBBLAS) $(LIBMETIS) $(LIBSUPERLU) $(LIBF77) $(LIBC)

......

$(DIROBJ)taucs_superlu_D$(OBJEXT): $(DIRSRC)taucs_superlu.c $(INCS) $(STDDEPS)
        $(CC) -c $(CFLAGS) $(STDDEFS) $(STDINCS) \
        -DTAUCS_CORE_DOUBLE \
        $(DIRSRC)taucs_superlu.c \
        $(COUTFLG)$(DIROBJ)taucs_superlu_D$(OBJEXT)

......

libtaucs_content = \
...
$(DIROBJ)taucs_superlu_D$(OBJEXT) \
...

2) In file '\config\win32_MT.mk', I added a definition to $(LIBSUPERLU) :
LIBSUPERLU = external\\lib\\win32\\libsuperlu_3.0.lib

3) I put a compiled SuperLU (v3.0) lib 'libsuperlu_3.0.lib' into folder 
'external\lib\win32\'

4) I put all header files into folder '\src\' needed when compiling 
'\src\taucs_superlu.c'

5) HERE, I begin to compile TAUCS by running build_taucs_win32_for_CGAL.bat. 
This stage goes without any problem!

The installation copys the 'libsuperlu_3.0.lib' into the folder 
'P:\ath\to\CGAL\auxiliary\taucs\lib' just as other libs, e.g., 'libatlas.lib'.

6) In order to use SuperLU, I added the declaration of functions 
'taucs_ccs_factor_superlu' and 'taucs_ccs_solve_superlu' into header 
'P:\ath\to\CGAL\auxiliary\taucs\include\taucs_private.h'

THEN, I call the function 'taucs_ccs_solve_superlu' in my VC8.0 project with 
correct CGAL settings (TAUCS lib/header). But the compiler complains the 
following linking error:
......
1>Linking...
1>libtaucs-vc71-mt-s.lib(taucs_superlu_D.obj) : error LNK2019: unresolved 
external symbol _StatFree referenced in function _taucs_ccs_factor_superlu
1>libtaucs-vc71-mt-s.lib(taucs_superlu_D.obj) : error LNK2019: unresolved 
external symbol _Destroy_CompCol_Permuted referenced in function 
_taucs_ccs_factor_superlu
1>libtaucs-vc71-mt-s.lib(taucs_superlu_D.obj) : error LNK2019: unresolved 
external symbol _Destroy_SuperMatrix_Store referenced in function 
_taucs_ccs_factor_superlu
......
1>Release\MeshStudio.exe : fatal error LNK1120: 14 unresolved externals


It seems the compiler does not know how to find the SuperLU lib. But in fact 
I have put 'libsuperlu_3.0.lib' into 'P:\ath\to\CGAL\auxiliary\taucs\lib' and 
my project has set the Additional Library Dir correctly as follows:
"$(CGALROOT)\lib";"$(CGALROOT)\auxiliary\gmp\lib";"$(CGALROOT)\auxiliary\taucs\lib"

I think there is no difference between 'libsuperlu_3.0.lib' and 
'libatlas.lib' (and other external libs such as 'liblapack.lib'). Why does 
the compiler know how to find 'libatlas.lib' but not 'libsuperlu_3.0.lib'?

Did I miss some other critical steps in this procedural? Can anyone tell me 
what's the problem?

Thank you for your patiently reading. I hope I have described my problem 
clearly.

Best regards!

                       Kevin