Add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 for CMake 4
If a dependency such as libpng has a cmake_minimum_required < 3.5, we
get an error message like the following from CMake 4.0.0:
CMake Error at [...]/CMakeLists.txt:33 (cmake_minimum_required):
Compatibility with CMake < 3.5 has been removed from CMake.
Update the VERSION argument <min> value. Or, use the <min>...<max> syntax
to tell CMake that the project requires at least <min> but has been updated
to work with policies introduced by <max> or earlier.
Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.
Add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to the CI workflow files that had
this error.
Fix https://github.com/AOMediaCodec/libavif/issues/2724.
diff --git a/.github/workflows/ci-unix-static-av2.yml b/.github/workflows/ci-unix-static-av2.yml
index de70ca3..2832804 100644
--- a/.github/workflows/ci-unix-static-av2.yml
+++ b/.github/workflows/ci-unix-static-av2.yml
@@ -41,8 +41,11 @@
libyuv: "LOCAL"
- name: Prepare libavif (cmake)
+ # CMake 4.0.0 removed compatibility with CMake < 3.5. Add
+ # -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.
run: >
cmake -G Ninja -S . -B build
+ -DCMAKE_POLICY_VERSION_MINIMUM=3.5
-DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=OFF
-DAVIF_CODEC_AVM=LOCAL
-DAVIF_CODEC_DAV1D=${{ matrix.also-enable-av1-codecs }}
diff --git a/.github/workflows/ci-windows.yml b/.github/workflows/ci-windows.yml
index c40a980..d2bd0b6 100644
--- a/.github/workflows/ci-windows.yml
+++ b/.github/workflows/ci-windows.yml
@@ -57,8 +57,11 @@
CXX: clang-cl
- name: Prepare libavif (cmake)
+ # CMake 4.0.0 removed compatibility with CMake < 3.5. Add
+ # -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.
run: >
cmake -G Ninja -S . -B build
+ -DCMAKE_POLICY_VERSION_MINIMUM=3.5
-DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=OFF
-DAVIF_CODEC_AOM=LOCAL -DAVIF_CODEC_DAV1D=LOCAL
-DAVIF_CODEC_RAV1E=LOCAL -DAVIF_CODEC_SVT=LOCAL
