Re: [Lapackpp-devel] undefined reference problem

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

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Your commands look fine, but they will work only in the simple case. You
specify "-llapackpp" on the gcc line so that your test.cc links against
liblapackpp.so. Obviously liblapackpp.so needs to link against more
libraries, which is why liblapack.so (without the pp) is linked in. This
one in turn needs to link against yet more libraries - on my system it
requires -lblas and -lg2c; maybe you should add these arguments to gcc
as well.

I don't specify the gcc line directly in my programs; instead, I let
libtool/automake generate that for me, and this will usually find the
appropriate linker flags automatically from the lib*.la files. In your
case the problem only is that some linker flags are missing but which
are required for your liblapack.so library.

BTW for future bugreports please remember to specify your compiler
version number and your OS (linux? bsd? amd64?).

Christian

Andrew Oh schrieb:
> Hey
> 
> 
> I tried compiling a simple "hello world" program and I get these errors:
> 
> 
> tg-login1 /users/aoh> g++ test.cc -I/usr/local/apps/mpich-gm/include
> -L/usr/local/apps/mpich-gm/lib -lmpich
> -I/usr/local/apps/lapackpp-2.4.8/include/lapackpp
> -L/usr/local/apps/lapackpp-2.4.8/lib -llapackpp
> -I/users/aoh/random/include
> 
> In file included from /usr/include/g++/backward/iostream.h:31,
>                 from test.cc:7:
> /usr/include/g++/backward/backward_warning.h:32:2: warning: #warning
> This file includes at least one deprecated or antiquated header.
> Please consider using one of the 32 headers found in section 17.4.1.2
> of the C++ standard. Examples include substituting the <X> header for
> the <X.h> header for C++ includes, or <sstream> instead of the
> deprecated header <strstream.h>. To disable this warning use
> -Wno-deprecated.
> /usr/local/apps/intel/compiler8/lib/libimf.so.6: warning: log2l is not
> implemented and will always fail
> /usr/local/apps/intel/compiler8/lib/libimf.so.6: warning: exp2l is not
> implemented and will always fail
> /usr/local/apps/intel/compiler8/lib/libcxa.so.6: undefined reference
> to `__ashldi3'
> /usr/lib/liblapack.so.3: undefined reference to `z_abs'
> /usr/lib/liblapack.so.3: undefined reference to `c_sqrt'
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