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# Add rules to copy & install shared library of name 'library_name' in the 'module_subdir' directory.
# If 'url' is a directory, the shared library (with platform-specific shared library prefixes and suffixes) will be
# taken from the directory, and whatever is found there will be used to produce the install rule.
# If the 'url' is a path to a file with the platform-specific shared library prefix and suffix, then that file
# will be used to produce the install rule.
# Otherwise, the 'url' is interpreted as an URL, and the content of the URL will be fetched, extracted and searched
# for the shared library to produce the install rule.
function(copy_fetched_shared_library library_name url)
set(shared_library_filename
"${CMAKE_SHARED_LIBRARY_PREFIX}${library_name}${CMAKE_SHARED_LIBRARY_SUFFIX}"
)
macro(from_glob dir)
# A little helper function
file(
GLOB_RECURSE source_object
"${dir}/${shared_library_filename}"
)
list(LENGTH source_object nmatches)
if(nmatches EQUAL 0)
message(
SEND_ERROR
"Unable to find ${shared_library_filename} in ${url}"
)
elseif(nmatches GREATER 1)
message(
SEND_ERROR
"Found multiple files named ${shared_library_filename} in ${url}"
)
endif()
endmacro()
if(IS_DIRECTORY "${url}")
# Just glob directly from a local directory
from_glob("${url}")
elseif(
url
MATCHES
"${CMAKE_SHARED_LIBRARY_PREFIX}.+${CMAKE_SHARED_LIBRARY_SUFFIX}$"
AND EXISTS "${url}"
)
# Otherwise, if it's a direct path to a shared object, use that
set(source_object "${url}")
else()
# Otherwise, download and extract from whatever URL we have
fetchcontent_declare(${library_name} URL "${url}")
fetchcontent_populate(${library_name})
from_glob(${${library_name}_SOURCE_DIR})
endif()
set(dest_object
${CMAKE_BINARY_DIR}/$<CONFIG>/${module_subdir}/${shared_library_filename}
)
add_custom_command(
OUTPUT ${dest_object}
COMMAND
${CMAKE_COMMAND} -E copy_if_different ${source_object}
${dest_object}
DEPENDS ${source_object}
VERBATIM
)
# Give this copying action a name
add_custom_target(copy-${library_name} DEPENDS ${dest_object})
set_target_properties(copy-${library_name} PROPERTIES FOLDER generated)
# Put this into a library target
add_library(${library_name} MODULE IMPORTED GLOBAL)
add_dependencies(${library_name} copy-${library_name})
set_property(
TARGET ${library_name}
PROPERTY IMPORTED_LOCATION ${dest_object}
)
endfunction()
function(install_fetched_shared_library library_name url)
copy_fetched_shared_library(${library_name} ${url})
set(shared_library_filename
"${CMAKE_SHARED_LIBRARY_PREFIX}${library_name}${CMAKE_SHARED_LIBRARY_SUFFIX}"
)
set(dest_object
${CMAKE_BINARY_DIR}/$<CONFIG>/${module_subdir}/${shared_library_filename}
)
install(PROGRAMS ${dest_object} DESTINATION ${module_subdir})
endfunction()
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