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# PACE library support for ML-PACE package
find_package(pace QUIET)
if(pace_FOUND)
find_package(pace)
target_link_libraries(lammps PRIVATE pace::pace)
else()
# set policy to silence warnings about timestamps of downloaded files. review occasionally if it may be set to NEW
if(POLICY CMP0135)
cmake_policy(SET CMP0135 OLD)
endif()
set(PACELIB_URL "https://github.com/ICAMS/lammps-user-pace/archive/refs/tags/v.2023.11.25.fix2.tar.gz" CACHE STRING "URL for PACE evaluator library sources")
set(PACELIB_MD5 "a53bd87cfee8b07d9f44bc17aad69c3f" CACHE STRING "MD5 checksum of PACE evaluator library tarball")
mark_as_advanced(PACELIB_URL)
mark_as_advanced(PACELIB_MD5)
GetFallbackURL(PACELIB_URL PACELIB_FALLBACK)
# LOCAL_ML-PACE points to top-level dir with local lammps-user-pace repo,
# to make it easier to check local build without going through the public github releases
if(LOCAL_ML-PACE)
set(lib-pace "${LOCAL_ML-PACE}")
else()
# download library sources to build folder
if(EXISTS ${CMAKE_BINARY_DIR}/libpace.tar.gz)
file(MD5 ${CMAKE_BINARY_DIR}/libpace.tar.gz DL_MD5)
endif()
if(NOT "${DL_MD5}" STREQUAL "${PACELIB_MD5}")
message(STATUS "Downloading ${PACELIB_URL}")
file(DOWNLOAD ${PACELIB_URL} ${CMAKE_BINARY_DIR}/libpace.tar.gz STATUS DL_STATUS SHOW_PROGRESS)
file(MD5 ${CMAKE_BINARY_DIR}/libpace.tar.gz DL_MD5)
if((NOT DL_STATUS EQUAL 0) OR (NOT "${DL_MD5}" STREQUAL "${PACELIB_MD5}"))
message(WARNING "Download from primary URL ${PACELIB_URL} failed\nTrying fallback URL ${PACELIB_FALLBACK}")
file(DOWNLOAD ${PACELIB_FALLBACK} ${CMAKE_BINARY_DIR}/libpace.tar.gz EXPECTED_HASH MD5=${PACELIB_MD5} SHOW_PROGRESS)
endif()
else()
message(STATUS "Using already downloaded archive ${CMAKE_BINARY_DIR}/libpace.tar.gz")
endif()
# uncompress downloaded sources
execute_process(
COMMAND ${CMAKE_COMMAND} -E remove_directory lammps-user-pace*
COMMAND ${CMAKE_COMMAND} -E tar xzf libpace.tar.gz
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
)
get_newest_file(${CMAKE_BINARY_DIR}/lammps-user-pace-* lib-pace)
endif()
# some preinstalled yaml-cpp versions don't provide a namespaced target
find_package(yaml-cpp QUIET)
if(TARGET yaml-cpp AND NOT TARGET yaml-cpp::yaml-cpp)
add_library(yaml-cpp::yaml-cpp ALIAS yaml-cpp)
endif()
add_subdirectory(${lib-pace} build-pace)
set_target_properties(pace PROPERTIES CXX_EXTENSIONS ON OUTPUT_NAME lammps_pace${LAMMPS_MACHINE})
if(CMAKE_PROJECT_NAME STREQUAL "lammps")
target_link_libraries(lammps PRIVATE pace)
endif()
endif()
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