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#!-------------------------------------------------------------------------------------------------!
#! CP2K: A general program to perform molecular dynamics simulations !
#! Copyright 2000-2025 CP2K developers group <https://cp2k.org> !
#! !
#! SPDX-License-Identifier: GPL-2.0-or-later !
#!-------------------------------------------------------------------------------------------------!
# Call to ensure that the git submodule in location `path` is loaded. If the
# submodule is not loaded, an error message that describes how to update the
# submodules is printed. Sets the variable name_avail to `ON` if the submodule
# is available, or `OFF` otherwise. copyright github.com/arbor-sim
function(check_git_submodule name path)
set(success_var "${name}_avail")
set(${success_var}
ON
PARENT_SCOPE)
get_filename_component(dotgit "${path}/.git" ABSOLUTE)
if(NOT EXISTS ${dotgit})
message(
FATAL_ERROR
"\nThe git submodule for ${name} is not available.\n"
"To check out all submodules use the following commands:\n"
" git submodule init\n"
" git submodule update\n"
"Or download submodules recursively when checking out:\n"
" git clone --recursive https://github.com/cp2k/cp2k.git\n")
endif()
endfunction()
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