Fix clang-cl warning flags: use /W4 instead of /Wall
#86
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This PR fixes the warning flags when building with **clang-cl**. Previously, the CMake configuration unconditionally added `-Wall -Wextra` for Clang. However, according to the [clang-cl documentation](https://clang.llvm.org/docs/UsersManual.html#clang-cl), `/Wall` in clang-cl is mapped to `-Weverything`, which enables **all possible warnings**, far more than MSVC’s `/Wall`. This results in a flood of warnings that are not intended. The original intent was to match MSVC `/W4` (≈ `-Wall -Wextra` in GCC/Clang).
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This PR fixes the warning flags when building with clang-cl.
Previously, the CMake configuration unconditionally added
-Wall -Wextrafor Clang. However, according to the clang-cl documentation,/Wallin clang-cl is mapped to-Weverything, which enables all possible warnings, far more than MSVC’s/Wall. This results in a flood of warnings that are not intended.The original intent was to match MSVC
/W4(≈-Wall -Wextrain GCC/Clang).