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Brad King authored
Since commit f593b354 (PCH: Add support for multi architecture iOS projects, 2020-04-02, v3.18.0-rc1~414^2) we use per-arch .pch files even when compiling for just the host architecture on macOS arm64. This breaks with compilers that do not support `-Xarch_` flags, such as GCC. Avoid using per-arch .pch files in single-architecture builds. Fixes: #25514 Issue: #20497
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