From 182a104478779922910207d544c441ebf357c543 Mon Sep 17 00:00:00 2001 From: Brad King Date: Mon, 6 Apr 2020 09:49:33 -0400 Subject: Help: Add 3.15 release note for change in -std= flag for compile features Issue: #19917 --- Help/release/3.15.rst | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Help/release/3.15.rst b/Help/release/3.15.rst index 957e6e9..e68e7d3 100644 --- a/Help/release/3.15.rst +++ b/Help/release/3.15.rst @@ -332,6 +332,15 @@ Deprecated and Removed Features Other Changes ============= +* If a feature specified by :command:`target_compile_features` is available + in the compiler's default standard level, CMake 3.14 and below incorrectly + added unnecessary ``-std=`` flags that could lower the standard level. + This bug has been fixed in CMake 3.15. This behavior change may expose + bugs in existing projects that were relying on undocumented implementation + details. Specifying compile features only ensures that the compiler runs + in a mode that has those features, not that any specific standard level is + used or explicit ``-std=`` flag passed. + * CMake learned how to compile C++14 with the IBM AIX XL compiler and the SunPro compiler and to compile C++20 with the AppleClang compiler. -- cgit v0.12