Raise CMake floor to 3.15...3.31 and use find_package(SQLite3) (subsumes #1084)

[bmehta001]

What

Raise the CMake floor for every repo-owned CMakeLists.txt to the range 3.15...3.31, and switch the legacy (non-vcpkg) Linux/macOS SQLite link to find_package(SQLite3) + the imported SQLite::SQLite3 target.

Why

CMake 4.0 removed support for cmake_minimum_required(VERSION <3.5). The repo still shipped wrappers/obj-c/CMakeLists.txt declaring 2.8.2, so configuring with CMake 4.x fails with:

CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

Normalizing all repo-owned floors to 3.15...3.31 makes the project configure under CMake 4.x while pinning a predictable policy ceiling. 3.15 is chosen as the floor because:

• the built-in FindSQLite3 module (used here) requires CMake >= 3.14, and
• several files already required 3.15.

This also subsumes #1084: in the legacy non-vcpkg Linux/macOS path, the bare "sqlite3" link name is replaced with find_package(SQLite3 REQUIRED) and SQLite::SQLite3, which carries its own include directories. The static-.a fallbacks (/usr/local, homebrew) and the vcpkg / Android-bundled / Windows .vcxproj paths are unchanged.

Vendored zlib/** CMakeLists are intentionally left untouched (already >= 3.5, so CMake-4.0-safe).

Files

• CMakeLists.txt (root)
• examples/{c/SampleC-Guest,cpp/EventSender,cpp/MacProxy,cpp/SampleCpp,cpp/SampleCppMini,objc/cocoa-app}/CMakeLists.txt
• lib/CMakeLists.txt (floor + find_package(SQLite3))
• lib/android_build/{app,maesdk}/src/main/cpp/CMakeLists.txt (maesdk was 3.10.2)
• tests/{vcpkg,functests,unittests}/CMakeLists.txt (functests/unittests: find_package(SQLite3))
• wrappers/{obj-c,swift}/CMakeLists.txt (obj-c was the 2.8.2 breakage)

Validation

• A real CMake 4.3.3 rejects the old 2.8.2 floor (Compatibility with CMake < 3.5 has been removed) and accepts 3.15...3.31 (Configuring done).
• Repo root configures cleanly under CMake 4.3.3 (Windows, vcpkg dependency path, MATSDK_USE_VCPKG_DEPS=ON).
• find_package(SQLite3 REQUIRED) + SQLite::SQLite3 resolves on Linux; the repo's legacy-Linux configure reaches the library target and find_package(ZLIB) cleanly.

Resolves #1339. Supersedes #1084.

[Copilot]

Pull request overview

This pull request updates the project’s CMake compatibility to configure cleanly with CMake 4.x by raising cmake_minimum_required() across repo-owned CMake projects to 3.15...3.31, and modernizes legacy (non-vcpkg) sqlite linking on Linux/macOS by using find_package(SQLite3) and the SQLite::SQLite3 imported target.

Changes:

• Raised the CMake policy/version floor across multiple repo-owned CMakeLists.txt files to 3.15...3.31 (CMake 4.x compatible while pinning a policy ceiling).
• Replaced legacy "sqlite3" link-name usage with find_package(SQLite3 REQUIRED) + SQLite::SQLite3 in legacy (non-vcpkg) build paths for the library and test targets.
• Normalized Android sample/app CMake floors to match the repo-wide baseline.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
CMakeLists.txt	Raises the root project’s CMake minimum/policy range to 3.15...3.31 for CMake 4.x compatibility.
lib/CMakeLists.txt	In legacy non-vcpkg mode, resolves SQLite via find_package(SQLite3) and links SQLite::SQLite3 instead of bare sqlite3.
tests/functests/CMakeLists.txt	Uses find_package(SQLite3) + SQLite::SQLite3 for the fallback legacy sqlite link path.
tests/unittests/CMakeLists.txt	Uses find_package(SQLite3) + SQLite::SQLite3 for the fallback legacy sqlite link path.
tests/vcpkg/CMakeLists.txt	Raises CMake minimum/policy range to 3.15...3.31 for vcpkg integration test project.
wrappers/obj-c/CMakeLists.txt	Raises CMake minimum/policy range to 3.15...3.31 to avoid CMake 4.x configure failure.
wrappers/swift/CMakeLists.txt	Raises CMake minimum/policy range to 3.15...3.31.
lib/android_build/maesdk/src/main/cpp/CMakeLists.txt	Raises Android CMake minimum/policy range to 3.15...3.31.
lib/android_build/app/src/main/cpp/CMakeLists.txt	Raises Android CMake minimum/policy range to 3.15...3.31.
examples/c/SampleC-Guest/CMakeLists.txt	Raises CMake minimum/policy range to 3.15...3.31.
examples/cpp/EventSender/CMakeLists.txt	Raises CMake minimum/policy range to 3.15...3.31.
examples/cpp/MacProxy/CMakeLists.txt	Raises CMake minimum/policy range to 3.15...3.31.
examples/cpp/SampleCpp/CMakeLists.txt	Raises CMake minimum/policy range to 3.15...3.31.
examples/cpp/SampleCppMini/CMakeLists.txt	Raises CMake minimum/policy range to 3.15...3.31.
examples/objc/cocoa-app/CMakeLists.txt	Raises CMake minimum/policy range to 3.15...3.31.

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