fixed merge issues

.github/workflows/CI.yml

@@ -2,6 +2,16 @@ name: CI
 
 on: [workflow_dispatch, push]
 
+env:
+  CARGO_TERM_COLOR: always
+  CMAKE_GENERATOR: Ninja
+  CMAKE_C_COMPILER_LAUNCHER: sccache
+  CMAKE_CXX_COMPILER_LAUNCHER: sccache
+  RUSTC_WRAPPER: sccache
+  SCCACHE_GHA_ENABLED: true
+  # FIXME: cc-rs on mac currently won't set the C++ standard correctly (https://github.com/dtolnay/cxx/issues/1217).
+  CXXFLAGS: -std=c++17
+
 jobs:
   Format:
     runs-on: ubuntu-latest