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add comments to document USER-HDNNP cmake scripting

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This commit is contained in:
Axel Kohlmeyer
2021-05-22 11:54:35 -04:00
parent eae4efdbde
commit 6fe5c338a8
1 changed files with 20 additions and 4 deletions
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24
cmake/Modules/Packages/USER-HDNNP.cmake
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@ -11,28 +11,34 @@ if(DOWNLOAD_N2P2)
mark_as_advanced(N2P2_URL)
mark_as_advanced(N2P2_MD5)
# adjust settings from detected compiler to compiler platform in n2p2 library
# set compiler specific flag to turn on C++11 syntax (required on macOS and CentOS 7)
if((CMAKE_CXX_COMPILER_ID STREQUAL "Clang") OR (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang"))
set(N2P2_COMP llvm)
set(N2P2_CXX_STD "-std=c++11")
elseif(${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel")
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
set(N2P2_COMP intel)
set(N2P2_CXX_STD "-std=c++11")
elseif(${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set(N2P2_COMP gnu)
set(N2P2_CXX_STD "-std=c++11")
elseif(${CMAKE_CXX_COMPILER_ID} STREQUAL "PGI")
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "PGI")
set(N2P2_COMP gnu)
set(N2P2_CXX_STD "--c++11")
else() # default
set(N2P2_COMP "")
endif()
# pass on archive creator command. prefer compiler specific version, if set.
# important when using cross compiler.
if(CMAKE_CXX_COMPILER_AR)
set(N2P2_AR ${CMAKE_CXX_COMPILER_AR})
else()
set(N2P2_AR ${CMAKE_AR})
endif()
# adjust compilation of n2p2 library to whether MPI is requested in LAMMPS or not
# need special care for compiling for MPICH2 with Linux-to-Windows cross compiler.
if(NOT BUILD_MPI)
set(N2P2_PROJECT_OPTIONS "-DN2P2_NO_MPI")
else()
@ -44,13 +50,18 @@ if(DOWNLOAD_N2P2)
endif()
endif()
# override compiler (optimization) flags in n2p2 library to flags used for LAMMPS
# specifically -march=native can result in problems when compiling on HPC clusters or with a cross compiler
# this convoluted way gets correct quoting/escaping when configuring the external project
string(TOUPPER "${CMAKE_BUILD_TYPE}" BTYPE)
set(N2P2_BUILD_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${BTYPE}} ${N2P2_CXX_STD}")
set(N2P2_BUILD_OPTIONS INTERFACES=LAMMPS COMP=${N2P2_COMP} "PROJECT_OPTIONS=${N2P2_PROJECT_OPTIONS}" "PROJECT_DEBUG="
"PROJECT_CC=${CMAKE_CXX_COMPILER}" "PROJECT_MPICC=${MPI_CXX_COMPILER}" "PROJECT_CFLAGS=${N2P2_BUILD_FLAGS}"
"PROJECT_AR=${N2P2_AR}")
# echo final flag for debugging
message(STATUS "N2P2 BUILD OPTIONS: ${N2P2_BUILD_OPTIONS}")
# download compile n2p2 library. much patch MPI calls in LAMMPS interface to accommodate MPI-2 (e.g. for cross-compiling)
include(ExternalProject)
ExternalProject_Add(n2p2_build
URL ${N2P2_URL}
@ -66,6 +77,8 @@ if(DOWNLOAD_N2P2)
SOURCE_SUBDIR src/
BUILD_BYPRODUCTS <SOURCE_DIR>/lib/libnnp.a <SOURCE_DIR>/lib/libnnpif.a
)
# create imported target LAMMPS::N2P2 from two libraries nnp and nnpif
ExternalProject_get_property(n2p2_build SOURCE_DIR)
# n2p2 core library "libnnp"
add_library(LAMMPS::N2P2::LIBNNP UNKNOWN IMPORTED)
@ -77,17 +90,20 @@ if(DOWNLOAD_N2P2)
set_target_properties(LAMMPS::N2P2::LIBNNPIF PROPERTIES
IMPORTED_LOCATION "${SOURCE_DIR}/lib/libnnpif.a"
INTERFACE_INCLUDE_DIRECTORIES "${SOURCE_DIR}/include")
# nnpif library has MPI calls if MPI is enabled, so we must link with MPI libs
if(BUILD_MPI)
set_target_properties(LAMMPS::N2P2::LIBNNPIF PROPERTIES
INTERFACE_LINK_LIBRARIES MPI::MPI_CXX)
endif()
# Put libnnp, libnnpif and include directory together.
# final step to define imported target
add_library(LAMMPS::N2P2 INTERFACE IMPORTED)
set_property(TARGET LAMMPS::N2P2 PROPERTY
INTERFACE_LINK_LIBRARIES LAMMPS::N2P2::LIBNNPIF LAMMPS::N2P2::LIBNNP)
target_link_libraries(lammps PRIVATE LAMMPS::N2P2)
add_dependencies(LAMMPS::N2P2 n2p2_build)
# work around issues with older CMake versions
file(MAKE_DIRECTORY "${SOURCE_DIR}/include")
file(MAKE_DIRECTORY "${SOURCE_DIR}/lib")
else()