Xcode Pods/FirebaseFirestore/Firestore/Source/API/FIRFirestoreSettings.mm

コンパイル時にAn attribute list cannot appear hereってエラーが出る

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// Public constant
ABSL_CONST_INIT extern "C" const int64_t kFIRFirestoreCacheSizeUnlimited =
    api::Settings::CacheSizeUnlimited;

コメントにしてこんなふうに変更

extern "C" const int64_t kFIRFirestoreCacheSizeUnlimited =
    api::Settings::CacheSizeUnlimited;