outcoldman added a comment.
The actual problem is with that clang-format does not know anything about c++17
features, because it does not set it in lang options. Not sure if that will fix
constexpr problem as well, but I could solve some other problems with
tools/clang
✓ 13:45:12
╰─ svn diff
Index: lib/Format/Format.cpp
===================================================================
--- lib/Format/Format.cpp (revision 297506)
+++ lib/Format/Format.cpp (working copy)
@@ -1893,6 +1893,7 @@
LangOpts.CPlusPlus = 1;
LangOpts.CPlusPlus11 = Style.Standard == FormatStyle::LS_Cpp03 ? 0 : 1;
LangOpts.CPlusPlus14 = Style.Standard == FormatStyle::LS_Cpp03 ? 0 : 1;
+ LangOpts.CPlusPlus1z = Style.Standard == FormatStyle::LS_Cpp03 ? 0 : 1;
LangOpts.LineComment = 1;
bool AlternativeOperators = Style.IsCpp();
LangOpts.CXXOperatorNames = AlternativeOperators ? 1 : 0;
https://reviews.llvm.org/D26953
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