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function(vcpkg_backup_env_variables)
cmake_parse_arguments(PARSE_ARGV 0 arg "" "" "VARS")
if(NOT DEFINED arg_VARS)
message(FATAL_ERROR "VARS must be defined.")
endif()
if(DEFINED arg_UNPARSED_ARGUMENTS)
message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION} was passed extra arguments: ${arg_UNPARSED_ARGUMENTS}")
endif()
foreach(envvar IN LISTS arg_VARS)
if(DEFINED ENV{${envvar}})
set("z_vcpkg_env_backup_${envvar}" "$ENV{${envvar}}" PARENT_SCOPE)
else()
unset("z_vcpkg_env_backup_${envvar}" PARENT_SCOPE)
endif()
endforeach()
endfunction()
function(vcpkg_restore_env_variables)
cmake_parse_arguments(PARSE_ARGV 0 arg "" "" "VARS")
if(NOT DEFINED arg_VARS)
message(FATAL_ERROR "VARS must be defined.")
endif()
if(DEFINED arg_UNPARSED_ARGUMENTS)
message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION} was passed extra arguments: ${arg_UNPARSED_ARGUMENTS}")
endif()
foreach(envvar IN LISTS arg_VARS)
if(DEFINED z_vcpkg_env_backup_${envvar})
set("ENV{${envvar}}" "${z_vcpkg_env_backup_${envvar}}")
else()
unset("ENV{${envvar}}")
endif()
endforeach()
endfunction()
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