forked from OSchip/llvm-project
bc40b76b5b
Fixes https://github.com/llvm/llvm-project/issues/31592. This commits enables lexing of digraphs in C++11 and onwards. Enabling them in C++03 is error-prone, as it would unconditionally treat sequences like "<:" as digraphs, even if they are followed by a single colon, e.g. "<::" would be treated as "[:" instead of "<" followed by "::". Lexing in C++11 doesn't have this problem as it looks ahead the following token. The relevant excerpt from Lexer::LexTokenInternal: ``` // C++0x [lex.pptoken]p3: // Otherwise, if the next three characters are <:: and the subsequent // character is neither : nor >, the < is treated as a preprocessor // token by itself and not as the first character of the alternative // token <:. ``` Also, note that both clang and gcc turn on digraphs by default (-fdigraphs), so clang-format should match this behaviour. Reviewed By: MyDeveloperDay, HazardyKnusperkeks, owenpan Differential Revision: https://reviews.llvm.org/D118706 |
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