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Silence the CMP0169 deprecation in cmake_fetch_content, fix stale guards

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tests/cmake_fetch_content/project calls the single-argument
FetchContent_Populate(json) after FetchContent_Declare(), which CMake
3.30 deprecated as CMP0169. Since the project declares
cmake_minimum_required(VERSION 3.11...3.14), the policy stays unset,
so every configure with a current CMake prints the deprecation
warning. The test is kept on purpose: it is the only coverage of the
FetchContent_Populate + add_subdirectory pattern for CMake 3.11-3.13
users, which the docs still describe as supported. Explicitly set
CMP0169 to OLD, with a comment explaining why.

Also fix two stale version guards:
- tests/cmake_fetch_content/CMakeLists.txt guarded the test with
  VERSION_GREATER "3.11.0", which is dead now that tests/CMakeLists.txt
  requires CMake 3.13.
- tests/cmake_fetch_content2/CMakeLists.txt guarded with
  VERSION_GREATER "3.14.0", which skips exactly 3.14.0, the first
  version with FetchContent_MakeAvailable. Change it to
  VERSION_GREATER_EQUAL "3.14".

Verified locally: `ctest -R cmake_fetch_content` passes with CMake
4.1, and the CMP0169 deprecation warning that appeared before this
change is gone.

Closes #5714 item 5.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-30 18:11:01 +02:00
parent b2760f273d
commit bb5449c8fc
3 changed files with 23 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tests/cmake_fetch_content/CMakeLists.txt
+14 -16
View File
@@ -1,21 +1,19 @@
if (${CMAKE_VERSION} VERSION_GREATER "3.11.0") add_test(NAME cmake_fetch_content_configure
add_test(NAME cmake_fetch_content_configure COMMAND ${CMAKE_COMMAND}
COMMAND ${CMAKE_COMMAND}
-G "${CMAKE_GENERATOR}" -G "${CMAKE_GENERATOR}"
-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER} -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS} -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
-Dnlohmann_json_source=${PROJECT_SOURCE_DIR} -Dnlohmann_json_source=${PROJECT_SOURCE_DIR}
${CMAKE_CURRENT_SOURCE_DIR}/project ${CMAKE_CURRENT_SOURCE_DIR}/project
) )
add_test(NAME cmake_fetch_content_build add_test(NAME cmake_fetch_content_build
COMMAND ${CMAKE_COMMAND} --build . COMMAND ${CMAKE_COMMAND} --build .
) )
set_tests_properties(cmake_fetch_content_configure PROPERTIES set_tests_properties(cmake_fetch_content_configure PROPERTIES
FIXTURES_SETUP cmake_fetch_content FIXTURES_SETUP cmake_fetch_content
LABELS "git_required;not_reproducible" LABELS "git_required;not_reproducible"
) )
set_tests_properties(cmake_fetch_content_build PROPERTIES set_tests_properties(cmake_fetch_content_build PROPERTIES
FIXTURES_REQUIRED cmake_fetch_content FIXTURES_REQUIRED cmake_fetch_content
LABELS "git_required;not_reproducible" LABELS "git_required;not_reproducible"
) )
endif()
tests/cmake_fetch_content/project/CMakeLists.txt
+8
View File
@@ -4,6 +4,14 @@ project(DummyImport CXX)
include(FetchContent) include(FetchContent)
# This test deliberately covers the pre-3.14 FetchContent_Populate pattern
# (see FetchContent_MakeAvailable in ../../cmake_fetch_content2/project for
# the 3.14+ alternative), which CMake 3.30 deprecated as CMP0169. Silence the
# deprecation warning on purpose instead of switching to the new pattern.
if(POLICY CMP0169)
cmake_policy(SET CMP0169 OLD)
endif()
get_filename_component(GIT_REPOSITORY_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/../../.. ABSOLUTE) get_filename_component(GIT_REPOSITORY_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/../../.. ABSOLUTE)
FetchContent_Declare(json GIT_REPOSITORY ${GIT_REPOSITORY_DIRECTORY} GIT_TAG HEAD) FetchContent_Declare(json GIT_REPOSITORY ${GIT_REPOSITORY_DIRECTORY} GIT_TAG HEAD)
tests/cmake_fetch_content2/CMakeLists.txt
+1 -1
View File
@@ -1,4 +1,4 @@
if (${CMAKE_VERSION} VERSION_GREATER "3.14.0") if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.14")
add_test(NAME cmake_fetch_content2_configure add_test(NAME cmake_fetch_content2_configure
COMMAND ${CMAKE_COMMAND} COMMAND ${CMAKE_COMMAND}
-G "${CMAKE_GENERATOR}" -G "${CMAKE_GENERATOR}"