fixes #2326

[itischler]

Fixes #2326

Description of changes:

• removed ifdef LB_GPU so that LB_ELECTROHYRODYNAMICS can be used without GPU

PR Checklist

• Tests?
  • Interface
  • Core
• Docs?

[KaiSzuttor]

although LB_ELECTROHYDRODYNAMICS implies LB, we should guard correctly. Thus: #ifdef LB_ELECTROHYDRODYNAMICS && ( defined(LB) || defined(LB_GPU))

[codecov]

Codecov Report

Merging #2354 into python will increase coverage by <1%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           python   #2354    +/-   ##
=======================================
+ Coverage      71%     71%   +<1%     
=======================================
  Files         381     381            
  Lines       18905   18905            
=======================================
+ Hits        13567   13587    +20     
+ Misses       5338    5318    -20

Impacted Files	Coverage Δ
src/core/cuda_interface.cpp	98% <ø> (ø)	⬆️
src/core/layered.cpp	79% <0%> (ø)	⬆️
src/core/domain_decomposition.cpp	91% <0%> (+3%)	⬆️
src/core/lattice.cpp	89% <0%> (+6%)	⬆️

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[fweik]

This code is only relevant to the GPU, so this should be if defined(LB_ELECTROHYDRODYNAMICS) && defined(LB_GPU) no?

[itischler]

Yes, but as long as the CUDA flag is enabled the cuda_interface will be compiled and thus this will lead to this compile error

[RudolfWeeber]

Can be merged