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-# Distributed under the OSI-approved MIT License. See accompanying
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-# file LICENSE or https://github.com/Crascit/DownloadProject for details.
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-#
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-# MODULE: DownloadProject
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-#
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-# PROVIDES:
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-# download_project( PROJ projectName
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-# [PREFIX prefixDir]
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-# [DOWNLOAD_DIR downloadDir]
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-# [SOURCE_DIR srcDir]
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-# [BINARY_DIR binDir]
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-# [QUIET]
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-# ...
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-# )
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-#
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-# Provides the ability to download and unpack a tarball, zip file, git repository,
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-# etc. at configure time (i.e. when the cmake command is run). How the downloaded
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-# and unpacked contents are used is up to the caller, but the motivating case is
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-# to download source code which can then be included directly in the build with
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-# add_subdirectory() after the call to download_project(). Source and build
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-# directories are set up with this in mind.
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-#
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-# The PROJ argument is required. The projectName value will be used to construct
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-# the following variables upon exit (obviously replace projectName with its actual
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-# value):
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-#
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-# projectName_SOURCE_DIR
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-# projectName_BINARY_DIR
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-#
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-# The SOURCE_DIR and BINARY_DIR arguments are optional and would not typically
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-# need to be provided. They can be specified if you want the downloaded source
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-# and build directories to be located in a specific place. The contents of
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-# projectName_SOURCE_DIR and projectName_BINARY_DIR will be populated with the
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-# locations used whether you provide SOURCE_DIR/BINARY_DIR or not.
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-#
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-# The DOWNLOAD_DIR argument does not normally need to be set. It controls the
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-# location of the temporary CMake build used to perform the download.
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-#
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-# The PREFIX argument can be provided to change the base location of the default
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-# values of DOWNLOAD_DIR, SOURCE_DIR and BINARY_DIR. If all of those three arguments
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-# are provided, then PREFIX will have no effect. The default value for PREFIX is
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-# CMAKE_BINARY_DIR.
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-#
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-# The QUIET option can be given if you do not want to show the output associated
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-# with downloading the specified project.
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-#
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-# In addition to the above, any other options are passed through unmodified to
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-# ExternalProject_Add() to perform the actual download, patch and update steps.
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-# The following ExternalProject_Add() options are explicitly prohibited (they
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-# are reserved for use by the download_project() command):
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-#
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-# CONFIGURE_COMMAND
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-# BUILD_COMMAND
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-# INSTALL_COMMAND
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-# TEST_COMMAND
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-#
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-# Only those ExternalProject_Add() arguments which relate to downloading, patching
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-# and updating of the project sources are intended to be used. Also note that at
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-# least one set of download-related arguments are required.
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-#
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-# If using CMake 3.2 or later, the UPDATE_DISCONNECTED option can be used to
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-# prevent a check at the remote end for changes every time CMake is run
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-# after the first successful download. See the documentation of the ExternalProject
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-# module for more information. It is likely you will want to use this option if it
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-# is available to you. Note, however, that the ExternalProject implementation contains
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-# bugs which result in incorrect handling of the UPDATE_DISCONNECTED option when
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-# using the URL download method or when specifying a SOURCE_DIR with no download
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-# method. Fixes for these have been created, the last of which is scheduled for
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-# inclusion in CMake 3.8.0. Details can be found here:
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-#
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-# https://gitlab.kitware.com/cmake/cmake/commit/bdca68388bd57f8302d3c1d83d691034b7ffa70c
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-# https://gitlab.kitware.com/cmake/cmake/issues/16428
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-#
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-# If you experience build errors related to the update step, consider avoiding
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-# the use of UPDATE_DISCONNECTED.
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-#
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-# EXAMPLE USAGE:
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-#
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-# include(DownloadProject)
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-# download_project(PROJ googletest
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-# GIT_REPOSITORY https://github.com/google/googletest.git
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-# GIT_TAG master
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-# UPDATE_DISCONNECTED 1
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-# QUIET
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-# )
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-#
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-# add_subdirectory(${googletest_SOURCE_DIR} ${googletest_BINARY_DIR})
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-#
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-#========================================================================================
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-
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-
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-set(_DownloadProjectDir "${CMAKE_CURRENT_LIST_DIR}")
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-
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-include(CMakeParseArguments)
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-
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-function(download_project)
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-
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- set(options QUIET)
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- set(oneValueArgs
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- PROJ
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- PREFIX
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- DOWNLOAD_DIR
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- SOURCE_DIR
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- BINARY_DIR
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- # Prevent the following from being passed through
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- CONFIGURE_COMMAND
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- BUILD_COMMAND
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- INSTALL_COMMAND
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- TEST_COMMAND
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- )
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- set(multiValueArgs "")
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-
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- cmake_parse_arguments(DL_ARGS "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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-
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- # Hide output if requested
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- if (DL_ARGS_QUIET)
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- set(OUTPUT_QUIET "OUTPUT_QUIET")
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- else()
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- unset(OUTPUT_QUIET)
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- message(STATUS "Downloading/updating ${DL_ARGS_PROJ}")
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- endif()
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-
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- # Set up where we will put our temporary CMakeLists.txt file and also
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- # the base point below which the default source and binary dirs will be.
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- # The prefix must always be an absolute path.
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- if (NOT DL_ARGS_PREFIX)
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- set(DL_ARGS_PREFIX "${CMAKE_BINARY_DIR}")
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- else()
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- get_filename_component(DL_ARGS_PREFIX "${DL_ARGS_PREFIX}" ABSOLUTE
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- BASE_DIR "${CMAKE_CURRENT_BINARY_DIR}")
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- endif()
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- if (NOT DL_ARGS_DOWNLOAD_DIR)
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- set(DL_ARGS_DOWNLOAD_DIR "${DL_ARGS_PREFIX}/${DL_ARGS_PROJ}-download")
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- endif()
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-
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- # Ensure the caller can know where to find the source and build directories
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- if (NOT DL_ARGS_SOURCE_DIR)
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- set(DL_ARGS_SOURCE_DIR "${DL_ARGS_PREFIX}/${DL_ARGS_PROJ}-src")
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- endif()
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- if (NOT DL_ARGS_BINARY_DIR)
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- set(DL_ARGS_BINARY_DIR "${DL_ARGS_PREFIX}/${DL_ARGS_PROJ}-build")
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- endif()
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- set(${DL_ARGS_PROJ}_SOURCE_DIR "${DL_ARGS_SOURCE_DIR}" PARENT_SCOPE)
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- set(${DL_ARGS_PROJ}_BINARY_DIR "${DL_ARGS_BINARY_DIR}" PARENT_SCOPE)
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-
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- # The way that CLion manages multiple configurations, it causes a copy of
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- # the CMakeCache.txt to be copied across due to it not expecting there to
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- # be a project within a project. This causes the hard-coded paths in the
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- # cache to be copied and builds to fail. To mitigate this, we simply
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- # remove the cache if it exists before we configure the new project. It
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- # is safe to do so because it will be re-generated. Since this is only
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- # executed at the configure step, it should not cause additional builds or
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- # downloads.
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- file(REMOVE "${DL_ARGS_DOWNLOAD_DIR}/CMakeCache.txt")
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-
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- # Create and build a separate CMake project to carry out the download.
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- # If we've already previously done these steps, they will not cause
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- # anything to be updated, so extra rebuilds of the project won't occur.
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- # Make sure to pass through CMAKE_MAKE_PROGRAM in case the main project
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- # has this set to something not findable on the PATH.
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- configure_file("${_DownloadProjectDir}/DownloadProject.CMakeLists.cmake.in"
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- "${DL_ARGS_DOWNLOAD_DIR}/CMakeLists.txt")
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- execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}"
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- -D "CMAKE_MAKE_PROGRAM:FILE=${CMAKE_MAKE_PROGRAM}"
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- .
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- RESULT_VARIABLE result
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- ${OUTPUT_QUIET}
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- WORKING_DIRECTORY "${DL_ARGS_DOWNLOAD_DIR}"
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- )
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- if(result)
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- message(FATAL_ERROR "CMake step for ${DL_ARGS_PROJ} failed: ${result}")
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- endif()
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- execute_process(COMMAND ${CMAKE_COMMAND} --build .
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- RESULT_VARIABLE result
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- ${OUTPUT_QUIET}
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- WORKING_DIRECTORY "${DL_ARGS_DOWNLOAD_DIR}"
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- )
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- if(result)
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- message(FATAL_ERROR "Build step for ${DL_ARGS_PROJ} failed: ${result}")
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- endif()
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-
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-endfunction()
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tamasmeszaros