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