Downgrade CMake to 3.29 to workaround Abseil issue.
This was fixed in https://github.com/abseil/abseil-cpp/commit/cd7f66cab520e99531979b3fd727a25616a1ccbb, but older versions of Abseil break in CMake 3.30, which github runners now use by default.
PiperOrigin-RevId: 651854867
diff --git a/.github/workflows/test_cpp.yml b/.github/workflows/test_cpp.yml
index 6c095a2..35ecae8 100644
--- a/.github/workflows/test_cpp.yml
+++ b/.github/workflows/test_cpp.yml
@@ -426,6 +426,12 @@
arch: ${{ matrix.windows-arch || 'x64' }}
vsversion: ${{ matrix.vsversion }}
+ # Workaround for Abseil incompatibility with CMake 3.30 (b/352354235).
+ - name: Downgrade CMake
+ if: ${{ runner.os == 'Windows' }}
+ run: choco install cmake --version 3.29.6 --force
+ shell: bash
+
# Workaround for incompatibility between gcloud and windows-2019 runners.
- name: Install Python
if: ${{ matrix.python-version }}