Re: [Lapackpp-devel] Help me: syntax errors from "COMPLEX" in Lapack++

[Christian S. <sti...@tu...>]

Dear Mohamad,

I am confident that you fill find plenty of documentation for these c++=20
tools. As for an example, I would mostly direct you to our package=20
package simthetic-mimolib, where you can download the configure.in and=20
Makefile.am files directly from CVS=20
http://cvs.sourceforge.net/viewcvs.py/simthetic/mimolib/ or rather=20
download a full package on=20
http://sourceforge.net/project/showfiles.php?group_id=3D89810&package_id=3D=
109380

Christian

mohamad chaitou schrieb:

> Thank you Christian,
> I follow your advices and i began reading some tutorials about "automak=
e=20
> and autoconf". It will be very helpful for me if you can send me an=20
> example of a configure.ac file and a Makefale.am which use the lapack++=
=20
> library.
> Thank you again and again...
>=20
> Christian Stimming a =E9crit :
>=20
>> mohamad chaitou schrieb:
>>
>>> The compile command i have used is very simple (maybe stupid) because=
=20
>>> i don't know how to deal with dependencies between these files!
>>> here its:
>>
>>
>>
>> C++ doesn't work this way, or in other words not that simple. You need=
=20
>> to get a textbook about how to use a C++ compiler, especially how to
>> 1. specify the directories to find the header files,
>> 2. specify the libraries to link against, and
>> 3. specify the directories where to find the libraries to link against.
>>
>> This is not a lapack++ problem but a general problem of how to write a=
=20
>> C++ program that uses other libraries.
>>
>>> g++ -Wall -c tEigSolve.cc
>>
>>
>>
>> In this case you are missing the specification of where to find=20
>> lapackpp's header files, which would usually look like this
>>
>> g++ -I/usr/include/lapackpp -c tEigSolve.cc
>>
>> Apart from this problem, this step obviously worked. This step is=20
>> called "compiling" and if you report a bug, it is important to note=20
>> the the "compiling" went ok.
>>
>>> g++ tEigSolve.o
>>
>>
>>
>> This other step obviously gave you errors. This step is called=20
>> "linking", so you got "linker errors". The point is that your c++=20
>> program uses extra libraries (lapack++'s libraries in this case), and=20
>> you must tell the linker which libraries to use and where to find it.=20
>> For example
>>
>> g++ -L/usr/lib -llamatrix++ -llapack++ -lblas++ -llapack -lblas=20
>> tEigSolve.o
>>
>> However, usually you don't call the compiler by hand. Instead, you use=
=20
>> some Makefile which contains the compiler commands (see "info make" on=
=20
>> your system). And even further, you don't even write the Makefile by=20
>> hand, but you have them generated by automake and autoconf (see "info=20
>> automake" and "info autoconf"). In that case, autoconf is configured=20
>> by a top-level file called "configure.in" or "configure.ac", and=20
>> configuration for Lapack++ use can be done through the macro=20
>> ACX_LAPACKPP which is included in the filename acx_lapackpp.m4. That's=
=20
>> how we are using this in our package simthetic-mimolib=20
>> http://cvs.sourceforge.net/viewcvs.py/simthetic/mimolib/
>>
>> Christian
>>
>>
>>
>=20
>=20
>=20
>=20
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>=20