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cmake_minimum_required(VERSION 3.29)
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cmake_policy(SET CMP0168 ${CMP0168})
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include(FetchContent)
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file(WRITE tmpFile.txt "Generated contents, not important")
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FetchContent_Populate(
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t1
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DOWNLOAD_COMMAND ${CMAKE_COMMAND} -E copy
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${CMAKE_CURRENT_BINARY_DIR}/tmpFile.txt
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<SOURCE_DIR>/done1.txt
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)
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if(NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/t1-src/done1.txt)
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message(FATAL_ERROR "Default SOURCE_DIR doesn't contain done1.txt")
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endif()
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if(CMP0168 STREQUAL "NEW" AND EXISTS ${CMAKE_CURRENT_BINARY_DIR}/t1-subbuild)
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message(FATAL_ERROR "t1 sub-build used when expected direct population")
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elseif(CMP0168 STREQUAL "OLD" AND NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/t1-subbuild)
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message(FATAL_ERROR "t1 used direct population when a sub-build was expected")
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endif()
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FetchContent_Populate(
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t2
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SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/mysrc
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DOWNLOAD_COMMAND ${CMAKE_COMMAND} -E copy
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${CMAKE_CURRENT_BINARY_DIR}/tmpFile.txt
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<SOURCE_DIR>/done2.txt
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)
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if(NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/mysrc/done2.txt)
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message(FATAL_ERROR "Specified SOURCE_DIR doesn't contain done2.txt")
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endif()
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if(CMP0168 STREQUAL "NEW" AND EXISTS ${CMAKE_CURRENT_BINARY_DIR}/t2-subbuild)
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message(FATAL_ERROR "t2 sub-build used when expected direct population")
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elseif(CMP0168 STREQUAL "OLD" AND NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/t2-subbuild)
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message(FATAL_ERROR "t2 used direct population when a sub-build was expected")
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endif()
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FetchContent_Populate(
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t3
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SOURCE_DIR myrelsrc
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DOWNLOAD_COMMAND ${CMAKE_COMMAND} -E copy
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${CMAKE_CURRENT_BINARY_DIR}/tmpFile.txt
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<SOURCE_DIR>/done3.txt
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)
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if(NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/myrelsrc/done3.txt)
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message(FATAL_ERROR "Relative SOURCE_DIR doesn't contain done3.txt")
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endif()
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if(CMP0168 STREQUAL "NEW" AND EXISTS ${CMAKE_CURRENT_BINARY_DIR}/t3-subbuild)
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message(FATAL_ERROR "t3 sub-build used when expected direct population")
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elseif(CMP0168 STREQUAL "OLD" AND NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/t3-subbuild)
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message(FATAL_ERROR "t3 used direct population when a sub-build was expected")
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endif()
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