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@@ -332,6 +332,15 @@ Deprecated and Removed Features
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Other Changes
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=============
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+* If a feature specified by :command:`target_compile_features` is available
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+ in the compiler's default standard level, CMake 3.14 and below incorrectly
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+ added unnecessary ``-std=`` flags that could lower the standard level.
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+ This bug has been fixed in CMake 3.15. This behavior change may expose
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+ bugs in existing projects that were relying on undocumented implementation
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+ details. Specifying compile features only ensures that the compiler runs
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+ in a mode that has those features, not that any specific standard level is
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+ used or explicit ``-std=`` flag passed.
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+
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* CMake learned how to compile C++14 with the IBM AIX XL compiler
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and the SunPro compiler and to compile C++20 with the AppleClang compiler.
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Brad King