Merge branch 'gridcomm-tiled' of github.com:lammps/lammps into gridcomm-tiled

.gitattributes export-ignore

.gitignore export-ignore

.github export-ignore

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        OR (${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang"))

      include(CheckCXXCompilerFlag)

      set(CMAKE_CUSTOM_LINKER_DEFAULT default)

      check_cxx_compiler_flag(-fuse-ld=lld HAVE_LLD_LINKER)

      check_cxx_compiler_flag(-fuse-ld=gold HAVE_GOLD_LINKER)

      check_cxx_compiler_flag(-fuse-ld=bfd HAVE_BFD_LINKER)

      if(HAVE_LLD_LINKER)

      check_cxx_compiler_flag(-fuse-ld=lld HAVE_LLD_LINKER_FLAG)

      check_cxx_compiler_flag(-fuse-ld=gold HAVE_GOLD_LINKER_FLAG)

      check_cxx_compiler_flag(-fuse-ld=bfd HAVE_BFD_LINKER_FLAG)

      find_program(HAVE_LLD_LINKER_BIN lld ld.lld)

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      endif()

      set(CMAKE_CUSTOM_LINKER_VALUES lld gold bfd default)

   incorrect periodic images of atoms in interaction lists.  To avoid, either use

   :doc:`pair style zero <pair_zero>` with a suitable cutoff or use :doc:`comm_modify cutoff <comm_modify>`.

*Communication cutoff is shorter than a bond length based estimate. This may lead to errors.*

   Since LAMMPS stores topology data with individual atoms, all atoms

   comprising a bond, angle, dihedral or improper must be present on any

   sub-domain that "owns" the atom with the information, either as a

   local or a ghost atom. The communication cutoff is what determines up

   to what distance from a sub-domain boundary ghost atoms are created.

   The communication cutoff is by default the largest non-bonded cutoff

   plus the neighbor skin distance, but for short or non-bonded cutoffs

   and/or long bonds, this may not be sufficient. This warning indicates

   that there is an increased risk of a simulation stopping unexpectedly

   because of Bond/Angle/Dihedral/Improper atoms missing.  It can be

   silenced by manually setting the communication cutoff via

   :doc:`comm_modify cutoff <comm_modify>`.  However, since the

   heuristic used to determine the estimate is not always accurate, it

   is not changed automatically and the warning may be ignored depending

   on the specific system being simulated.

*Communication cutoff is too small for SNAP micro load balancing, increased to %lf*

   Self-explanatory.

   \left[ 1 - \frac{\left(5 ~ a^6+45~a^4~r^2+63~a^2~r^4+15~r^6\right) \sigma^6}

   {15 \left(a-r\right)^6 \left( a+r \right)^6} \right], \quad r < r_c

where :math:A_{cs}` is the Hamaker constant, *a* is the radius of the colloidal

where :math:`A_{cs}` is the Hamaker constant, *a* is the radius of the colloidal

particle, and :math:`r_c` is the cutoff.  This formula is derived from the

colloid-colloid interaction, letting one of the particle sizes go to

zero.