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This causes issues when using clang with -frewrite-includes to e.g., submit the translation unit to a distributed compiler. In my case, I was building Firefox using sccache. See [1] for a reduced test-case since I initially thought this was a clang bug, and [2] for more context. Apparently doing this is invalid C++ per [cpp.cond], which mentions [3]: > The #ifdef and #ifndef directives, and the defined conditional > inclusion operator, shall treat __has_include and __has_cpp_attribute > as if they were the names of defined macros. The identifiers > __has_include and __has_cpp_attribute shall not appear in any context > not mentioned in this subclause. [1]: https://bugs.llvm.org/show_bug.cgi?id=43982 [2]: https://bugs.llvm.org/show_bug.cgi?id=37990 [3]: http://eel.is/c++draft/cpp.cond#7.sentence-2 Change-Id: Id4b8ee19176a9e4624b533087ba870c418f27e60 |
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