cannot build the example/COUPLE/simple

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1

Hi all,

I cannot build the example/COUPLE/simple according to the README instructions.

$ mpicc -I/home/bz186/lammps/src -c simple.c

$ mpicc -L/home/bz186/lammps/build simple.o -llammps -o simpleC
/usr/bin/ld: /home/bz186/lammps/build/liblammps.a(variable.cpp.o): undefined reference to symbol ‘floor@@GLIBC_2.2.5’
//usr/lib64/libm.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

It seems the first line works, but linking the object file fails.

I found there was a post in 2016 about this. I tried the script provided, but the error still occurs.

I also tried to switch openmpi/2.1.1 to mvapich2/2.2, but still not working.

How can I fix this ?

Thanks,

Bo

2

the error message from the linker is quite clear, you need to add -lm to also link with libm.so

since you built a static and not a shared library, you need to link with all libraries and flags that are also required for linking the LAMMPS executable.
more explanations are given here: https://lammps.sandia.gov/doc/Build_link.html

axel.

3

Hi Axel,

I think I found the solution. The command in the example/COUPLE/simple/README is not consistent with the documentation website.

When linking the object, we have to use mpicxx since lammps is a c++ code.

Bo

4

The README file describes an example with having LAMMPS compiled as a shared library. For that specific case, using a C compiler is sufficient.

The manual discusses both cases.

Axel.