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41e0ca0a68
This updates the mininum required version of CMake to 3.13, which is present in Debian Buster. At the same time, move all of our dependency handling to use `FetchContent_Declare()`, `FetchContent_Populate()` and `FetchContent_MakeAvailable()`. Since the latter was ony introduced in 3.14, provide a simple "polyfill" implementation for that. As an added benefit, the configure step for libffi and libunwind will now not be re-run every time the `CMakeLists.txt` changes. Other changes: - Explicitly spell out that we're testing up to 3.22 in `cmake_minimum_version()` - Rename `check_target()` to `sapi_check_target()` to avoid conflicts with Abseil.
33 lines
1.2 KiB
CMake
33 lines
1.2 KiB
CMake
# Copyright 2022 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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include(FetchContent)
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if(CMAKE_VERSION VERSION_LESS 3.14)
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# Simple implementation for CMake 3.13, which is missing this.
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macro(FetchContent_MakeAvailable)
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foreach(content_name IN ITEMS ${ARGV})
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string(TOLOWER ${content_name} content_name_lower)
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FetchContent_GetProperties(${content_name})
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if(NOT ${content_name_lower}_POPULATED)
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FetchContent_Populate(${content_name})
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if(EXISTS ${${content_name_lower}_SOURCE_DIR}/CMakeLists.txt)
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add_subdirectory(${${content_name_lower}_SOURCE_DIR}
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${${content_name_lower}_BINARY_DIR})
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endif()
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endif()
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endforeach()
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endmacro()
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endif()
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